用于EagleEye3.0 规则集漏报和误报测试的示例项目,项目收集于github和gitee
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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
// SHOW TABLE, SHOW DATABASES, etc.
#include "sql/sql_show.h"
#include "my_config.h"
#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <algorithm>
#include <atomic>
#include <functional>
#include <memory>
#include <new>
#include <string>
#include "keycache.h" // dflt_key_cache
#include "mutex_lock.h" // MUTEX_LOCK
#include "mysql/components/services/log_builtins.h" // LogErr
#include "mysql/plugin.h" // st_mysql_plugin
#include "scope_guard.h" // Scope_guard
#include "sql/auth/auth_acls.h" // DB_ACLS
#include "sql/dd/cache/dictionary_client.h" // dd::cache::Dictionary_client
#include "sql/dd/dd_schema.h" // dd::Schema_MDL_locker
#include "sql/dd/dd_table.h" // is_encrypted
#include "sql/dd/types/column.h" // dd::Column
#include "sql/dd/types/table.h" // dd::Table
#include "sql/debug_sync.h" // DEBUG_SYNC
#include "sql/derror.h" // ER_THD
#include "sql/error_handler.h" // Internal_error_handler
#include "sql/field.h" // Field
#include "sql/filesort.h" // filesort_free_buffers
#include "sql/item.h" // Item_empty_string
#include "sql/log.h" // query_logger
#include "sql/mysqld.h" // lower_case_table_names
#include "sql/mysqld_thd_manager.h" // Global_THD_manager
#include "sql/opt_trace.h" // fill_optimizer_trace_info
#include "sql/partition_info.h" // partition_info
#include "sql/protocol.h" // Protocol
#include "sql/sp_head.h" // sp_head
#include "sql/sql_base.h" // close_thread_tables
#include "sql/sql_class.h" // THD
#include "sql/sql_db.h" // get_default_db_collation
#include "sql/sql_executor.h" // QEP_TAB
#include "sql/sql_lex.h" // LEX
#include "sql/sql_optimizer.h" // JOIN
#include "sql/sql_parse.h" // command_name
#include "sql/sql_partition.h" // HA_USE_AUTO_PARTITION
#include "sql/sql_plugin.h" // PLUGIN_IS_DELETED, LOCK_plugin
#include "sql/sql_profile.h" // query_profile_statistics_info
#include "sql/sql_table.h" // primary_key_name
#include "sql/sql_tmp_table.h" // create_ondisk_from_heap
#include "sql/sql_trigger.h" // acquire_shared_mdl_for_trigger
#include "sql/strfunc.h" // lex_string_strmake
#include "sql/table_trigger_dispatcher.h" // Table_trigger_dispatcher
#include "sql/temp_table_param.h" // Temp_table_param
#include "sql/trigger.h" // Trigger
#include "sql/tztime.h" // my_tz_SYSTEM
/* @see dynamic_privileges_table.cc */
bool iterate_all_dynamic_privileges(THD *thd,
std::function<bool(const char *)> action);
using std::max;
using std::min;
/**
@class CSET_STRING
@brief Character set armed LEX_CSTRING
*/
class CSET_STRING {
private:
LEX_CSTRING string;
const CHARSET_INFO *cs;
public:
CSET_STRING() : cs(&my_charset_bin) {
string.str = NULL;
string.length = 0;
}
CSET_STRING(const char *str_arg, size_t length_arg,
const CHARSET_INFO *cs_arg)
: cs(cs_arg) {
DBUG_ASSERT(cs_arg != NULL);
string.str = str_arg;
string.length = length_arg;
}
inline const char *str() const { return string.str; }
inline size_t length() const { return string.length; }
const CHARSET_INFO *charset() const { return cs; }
};
static const char *grant_names[] = {
"select", "insert", "update", "delete", "create", "drop", "reload",
"shutdown", "process", "file", "grant", "references", "index", "alter"};
TYPELIB grant_types = {sizeof(grant_names) / sizeof(char **), "grant_types",
grant_names, NULL};
static void store_key_options(THD *thd, String *packet, TABLE *table,
KEY *key_info);
static void get_cs_converted_string_value(THD *thd, String *input_str,
String *output_str,
const CHARSET_INFO *cs, bool use_hex);
static void append_algorithm(TABLE_LIST *table, String *buff);
static void view_store_create_info(const THD *thd, TABLE_LIST *table,
String *buff);
/***************************************************************************
** List all table types supported
***************************************************************************/
static size_t make_version_string(char *buf, size_t buf_length, uint version) {
return snprintf(buf, buf_length, "%d.%d", version >> 8, version & 0xff);
}
static bool show_plugins(THD *thd, plugin_ref plugin, void *arg) {
TABLE *table = (TABLE *)arg;
struct st_mysql_plugin *plug = plugin_decl(plugin);
struct st_plugin_dl *plugin_dl = plugin_dlib(plugin);
CHARSET_INFO *cs = system_charset_info;
char version_buf[20];
restore_record(table, s->default_values);
DBUG_EXECUTE_IF("set_uninstall_sync_point", {
if (strcmp(plugin_name(plugin)->str, "EXAMPLE") == 0)
DEBUG_SYNC(thd, "before_store_plugin_name");
});
mysql_mutex_lock(&LOCK_plugin);
if (plugin == nullptr || plugin_state(plugin) == PLUGIN_IS_FREED) {
mysql_mutex_unlock(&LOCK_plugin);
return false;
}
table->field[0]->store(plugin_name(plugin)->str, plugin_name(plugin)->length,
cs);
table->field[1]->store(
version_buf,
make_version_string(version_buf, sizeof(version_buf), plug->version), cs);
switch (plugin_state(plugin)) {
/* case PLUGIN_IS_FREED: does not happen */
case PLUGIN_IS_DELETED:
table->field[2]->store(STRING_WITH_LEN("DELETED"), cs);
break;
case PLUGIN_IS_UNINITIALIZED:
case PLUGIN_IS_WAITING_FOR_UPGRADE:
table->field[2]->store(STRING_WITH_LEN("INACTIVE"), cs);
break;
case PLUGIN_IS_READY:
table->field[2]->store(STRING_WITH_LEN("ACTIVE"), cs);
break;
case PLUGIN_IS_DYING:
table->field[2]->store(STRING_WITH_LEN("DELETING"), cs);
break;
case PLUGIN_IS_DISABLED:
table->field[2]->store(STRING_WITH_LEN("DISABLED"), cs);
break;
default:
DBUG_ASSERT(0);
}
table->field[3]->store(plugin_type_names[plug->type].str,
plugin_type_names[plug->type].length, cs);
table->field[4]->store(version_buf,
make_version_string(version_buf, sizeof(version_buf),
*(uint *)plug->info),
cs);
if (plugin_dl) {
table->field[5]->store(plugin_dl->dl.str, plugin_dl->dl.length, cs);
table->field[5]->set_notnull();
table->field[6]->store(version_buf,
make_version_string(version_buf, sizeof(version_buf),
plugin_dl->version),
cs);
table->field[6]->set_notnull();
} else {
table->field[5]->set_null();
table->field[6]->set_null();
}
if (plug->author) {
table->field[7]->store(plug->author, strlen(plug->author), cs);
table->field[7]->set_notnull();
} else
table->field[7]->set_null();
if (plug->descr) {
table->field[8]->store(plug->descr, strlen(plug->descr), cs);
table->field[8]->set_notnull();
} else
table->field[8]->set_null();
switch (plug->license) {
case PLUGIN_LICENSE_GPL:
table->field[9]->store(PLUGIN_LICENSE_GPL_STRING,
strlen(PLUGIN_LICENSE_GPL_STRING), cs);
break;
case PLUGIN_LICENSE_BSD:
table->field[9]->store(PLUGIN_LICENSE_BSD_STRING,
strlen(PLUGIN_LICENSE_BSD_STRING), cs);
break;
default:
table->field[9]->store(PLUGIN_LICENSE_PROPRIETARY_STRING,
strlen(PLUGIN_LICENSE_PROPRIETARY_STRING), cs);
break;
}
table->field[9]->set_notnull();
table->field[10]->store(
global_plugin_typelib_names[plugin_load_option(plugin)],
strlen(global_plugin_typelib_names[plugin_load_option(plugin)]), cs);
mysql_mutex_unlock(&LOCK_plugin);
return schema_table_store_record(thd, table);
}
static int fill_plugins(THD *thd, TABLE_LIST *tables, Item *) {
DBUG_TRACE;
if (plugin_foreach_with_mask(thd, show_plugins, MYSQL_ANY_PLUGIN,
~PLUGIN_IS_FREED, tables->table))
return 1;
return 0;
}
/***************************************************************************
List all privileges supported
***************************************************************************/
struct show_privileges_st {
const char *privilege;
const char *context;
const char *comment;
};
static struct show_privileges_st sys_privileges[] = {
{"Alter", "Tables", "To alter the table"},
{"Alter routine", "Functions,Procedures",
"To alter or drop stored functions/procedures"},
{"Create", "Databases,Tables,Indexes",
"To create new databases and tables"},
{"Create routine", "Databases", "To use CREATE FUNCTION/PROCEDURE"},
{"Create role", "Server Admin", "To create new roles"},
{"Create temporary tables", "Databases", "To use CREATE TEMPORARY TABLE"},
{"Create view", "Tables", "To create new views"},
{"Create user", "Server Admin", "To create new users"},
{"Delete", "Tables", "To delete existing rows"},
{"Drop", "Databases,Tables", "To drop databases, tables, and views"},
{"Drop role", "Server Admin", "To drop roles"},
{"Event", "Server Admin", "To create, alter, drop and execute events"},
{"Execute", "Functions,Procedures", "To execute stored routines"},
{"File", "File access on server", "To read and write files on the server"},
{"Grant option", "Databases,Tables,Functions,Procedures",
"To give to other users those privileges you possess"},
{"Index", "Tables", "To create or drop indexes"},
{"Insert", "Tables", "To insert data into tables"},
{"Lock tables", "Databases",
"To use LOCK TABLES (together with SELECT privilege)"},
{"Process", "Server Admin",
"To view the plain text of currently executing queries"},
{"Proxy", "Server Admin", "To make proxy user possible"},
{"References", "Databases,Tables", "To have references on tables"},
{"Reload", "Server Admin",
"To reload or refresh tables, logs and privileges"},
{"Replication client", "Server Admin",
"To ask where the slave or master servers are"},
{"Replication slave", "Server Admin",
"To read binary log events from the master"},
{"Select", "Tables", "To retrieve rows from table"},
{"Show databases", "Server Admin",
"To see all databases with SHOW DATABASES"},
{"Show view", "Tables", "To see views with SHOW CREATE VIEW"},
{"Shutdown", "Server Admin", "To shut down the server"},
{"Super", "Server Admin",
"To use KILL thread, SET GLOBAL, CHANGE MASTER, etc."},
{"Trigger", "Tables", "To use triggers"},
{"Create tablespace", "Server Admin", "To create/alter/drop tablespaces"},
{"Update", "Tables", "To update existing rows"},
{"Usage", "Server Admin", "No privileges - allow connect only"},
{NullS, NullS, NullS}};
bool mysqld_show_privileges(THD *thd) {
List<Item> field_list;
Protocol *protocol = thd->get_protocol();
DBUG_TRACE;
field_list.push_back(new Item_empty_string("Privilege", 10));
field_list.push_back(new Item_empty_string("Context", 15));
field_list.push_back(new Item_empty_string("Comment", NAME_CHAR_LEN));
if (thd->send_result_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
return true;
show_privileges_st *privilege = sys_privileges;
for (privilege = sys_privileges; privilege->privilege; privilege++) {
protocol->start_row();
protocol->store(privilege->privilege, system_charset_info);
protocol->store(privilege->context, system_charset_info);
protocol->store(privilege->comment, system_charset_info);
if (protocol->end_row()) return true;
}
if (iterate_all_dynamic_privileges(thd,
/*
For each registered dynamic privilege
send a strz to this lambda function.
*/
[&](const char *c) -> bool {
protocol->start_row();
protocol->store(c, system_charset_info);
protocol->store("Server Admin",
system_charset_info);
protocol->store("", system_charset_info);
if (protocol->end_row()) return true;
return false;
})) {
return true;
}
my_eof(thd);
return false;
}
/**
An Internal_error_handler that suppresses errors regarding views'
underlying tables that occur during privilege checking within SHOW CREATE
VIEW commands. This happens in the cases when
- A view's underlying table (e.g. referenced in its SELECT list) does not
exist or columns of underlying table are altered. There should not be an
error as no attempt was made to access it per se.
- Access is denied for some table, column, function or stored procedure
such as mentioned above. This error gets raised automatically, since we
can't untangle its access checking from that of the view itself.
*/
class Show_create_error_handler : public Internal_error_handler {
TABLE_LIST *m_top_view;
bool m_handling;
Security_context *m_sctx;
char m_view_access_denied_message[MYSQL_ERRMSG_SIZE];
const char *m_view_access_denied_message_ptr;
public:
/**
Creates a new Show_create_error_handler for the particular security
context and view.
@param thd Thread context, used for security context information if needed.
@param top_view The view. We do not verify at this point that top_view is
in fact a view since, alas, these things do not stay constant.
*/
explicit Show_create_error_handler(THD *thd, TABLE_LIST *top_view)
: m_top_view(top_view),
m_handling(false),
m_view_access_denied_message_ptr(NULL) {
m_sctx = (m_top_view->security_ctx != nullptr) ? m_top_view->security_ctx
: thd->security_context();
}
private:
/**
Lazy instantiation of 'view access denied' message. The purpose of the
Show_create_error_handler is to hide details of underlying tables for
which we have no privileges behind ER_VIEW_INVALID messages. But this
obviously does not apply if we lack privileges on the view itself.
Unfortunately the information about for which table privilege checking
failed is not available at this point. The only way for us to check is by
reconstructing the actual error message and see if it's the same.
*/
// MY_ATTRIBUTE((unused)) This applies to CHECK_ERRMSG_FORMAT = ON
const char *get_view_access_denied_message(THD *thd MY_ATTRIBUTE((unused))) {
if (!m_view_access_denied_message_ptr) {
m_view_access_denied_message_ptr = m_view_access_denied_message;
snprintf(m_view_access_denied_message, MYSQL_ERRMSG_SIZE,
ER_THD(thd, ER_TABLEACCESS_DENIED_ERROR), "SHOW VIEW",
m_sctx->priv_user().str, m_sctx->host_or_ip().str,
m_top_view->get_table_name());
}
return m_view_access_denied_message_ptr;
}
public:
virtual bool handle_condition(THD *thd, uint sql_errno, const char *,
Sql_condition::enum_severity_level *,
const char *msg) {
/*
The handler does not handle the errors raised by itself.
At this point we know if top_view is really a view.
*/
if (m_handling || !m_top_view->is_view()) return false;
m_handling = true;
bool is_handled;
switch (sql_errno) {
case ER_TABLEACCESS_DENIED_ERROR:
if (!strcmp(get_view_access_denied_message(thd), msg)) {
/* Access to top view is not granted, don't interfere. */
is_handled = false;
break;
}
// Fall through
case ER_COLUMNACCESS_DENIED_ERROR:
// ER_VIEW_NO_EXPLAIN cannot happen here.
case ER_PROCACCESS_DENIED_ERROR:
is_handled = true;
break;
case ER_BAD_FIELD_ERROR:
/*
Established behavior: warn if column of underlying table is altered.
*/
case ER_NO_SUCH_TABLE:
/* Established behavior: warn if underlying tables are missing. */
case ER_SP_DOES_NOT_EXIST:
/* Established behavior: warn if underlying functions are missing. */
push_warning_printf(thd, Sql_condition::SL_WARNING, ER_VIEW_INVALID,
ER_THD(thd, ER_VIEW_INVALID),
m_top_view->get_db_name(),
m_top_view->get_table_name());
is_handled = true;
break;
default:
is_handled = false;
}
m_handling = false;
return is_handled;
}
};
bool mysqld_show_create(THD *thd, TABLE_LIST *table_list) {
Protocol *protocol = thd->get_protocol();
char buff[2048];
String buffer(buff, sizeof(buff), system_charset_info);
List<Item> field_list;
bool error = true;
DBUG_TRACE;
DBUG_PRINT("enter",
("db: %s table: %s", table_list->db, table_list->table_name));
/*
Metadata locks taken during SHOW CREATE should be released when
the statmement completes as it is an information statement.
*/
MDL_savepoint mdl_savepoint = thd->mdl_context.mdl_savepoint();
/* We want to preserve the tree for views. */
thd->lex->context_analysis_only |= CONTEXT_ANALYSIS_ONLY_VIEW;
{
/*
If there is an error during processing of an underlying view, an
error message is wanted, but it has to be converted to a warning,
so that execution can continue.
This is handled by the Show_create_error_handler class.
Use open_tables() instead of open_tables_for_query(). If an error occurs,
this will ensure that tables are not closed on error, but remain open
for the rest of the processing of the SHOW statement.
*/
Show_create_error_handler view_error_suppressor(thd, table_list);
thd->push_internal_handler(&view_error_suppressor);
uint counter;
bool open_error = open_tables(thd, &table_list, &counter,
MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL);
if (!open_error && table_list->is_view_or_derived()) {
/*
Prepare result table for view so that we can read the column list.
Notice that Show_create_error_handler remains active, so that any
errors due to missing underlying objects are converted to warnings.
*/
open_error = table_list->resolve_derived(thd, true);
}
thd->pop_internal_handler();
if (open_error && (thd->killed || thd->is_error())) goto exit;
}
/* TODO: add environment variables show when it become possible */
if (thd->lex->only_view && !table_list->is_view()) {
my_error(ER_WRONG_OBJECT, MYF(0), table_list->db, table_list->table_name,
"VIEW");
goto exit;
}
buffer.length(0);
if (table_list->is_view())
buffer.set_charset(table_list->view_creation_ctx->get_client_cs());
if (table_list->is_view())
view_store_create_info(thd, table_list, &buffer);
else if (store_create_info(thd, table_list, &buffer, NULL,
false /* show_database */))
goto exit;
if (table_list->is_view()) {
field_list.push_back(new Item_empty_string("View", NAME_CHAR_LEN));
field_list.push_back(new Item_empty_string(
"Create View", max<uint>(buffer.length(), 1024U)));
field_list.push_back(
new Item_empty_string("character_set_client", MY_CS_NAME_SIZE));
field_list.push_back(
new Item_empty_string("collation_connection", MY_CS_NAME_SIZE));
} else {
field_list.push_back(new Item_empty_string("Table", NAME_CHAR_LEN));
// 1024 is for not to confuse old clients
field_list.push_back(new Item_empty_string(
"Create Table", max<size_t>(buffer.length(), 1024U)));
}
if (thd->send_result_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
goto exit;
protocol->start_row();
if (table_list->is_view())
protocol->store(table_list->view_name.str, system_charset_info);
else {
if (table_list->schema_table)
protocol->store(table_list->schema_table->table_name,
system_charset_info);
else
protocol->store(table_list->table->alias, system_charset_info);
}
if (table_list->is_view()) {
protocol->store_string(buffer.ptr(), buffer.length(),
table_list->view_creation_ctx->get_client_cs());
protocol->store(table_list->view_creation_ctx->get_client_cs()->csname,
system_charset_info);
protocol->store(table_list->view_creation_ctx->get_connection_cl()->name,
system_charset_info);
} else
protocol->store_string(buffer.ptr(), buffer.length(), buffer.charset());
if (protocol->end_row()) goto exit;
error = false;
my_eof(thd);
exit:
close_thread_tables(thd);
/* Release any metadata locks taken during SHOW CREATE. */
thd->mdl_context.rollback_to_savepoint(mdl_savepoint);
return error;
}
bool mysqld_show_create_db(THD *thd, char *dbname,
HA_CREATE_INFO *create_info) {
char buff[2048], orig_dbname[NAME_LEN];
String buffer(buff, sizeof(buff), system_charset_info);
Security_context *sctx = thd->security_context();
uint db_access;
HA_CREATE_INFO create;
uint create_options = create_info ? create_info->options : 0;
Protocol *protocol = thd->get_protocol();
DBUG_TRACE;
strcpy(orig_dbname, dbname);
if (lower_case_table_names && dbname != any_db)
my_casedn_str(files_charset_info, dbname);
if (sctx->check_access(DB_OP_ACLS, orig_dbname))
db_access = DB_OP_ACLS;
else {
if (sctx->get_active_roles()->size() > 0 && dbname != 0) {
db_access = sctx->db_acl({dbname, strlen(dbname)});
} else {
db_access = (acl_get(thd, sctx->host().str, sctx->ip().str,
sctx->priv_user().str, dbname, 0) |
sctx->master_access(dbname ? dbname : ""));
}
}
if (!(db_access & DB_OP_ACLS) && check_grant_db(thd, dbname)) {
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0), sctx->priv_user().str,
sctx->host_or_ip().str, dbname);
query_logger.general_log_print(
thd, COM_INIT_DB, ER_DEFAULT(ER_DBACCESS_DENIED_ERROR),
sctx->priv_user().str, sctx->host_or_ip().str, dbname);
return true;
}
bool is_encrypted_schema = false;
if (is_infoschema_db(dbname)) {
create.default_table_charset = system_charset_info;
} else {
dd::Schema_MDL_locker mdl_handler(thd);
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
const dd::Schema *schema = nullptr;
if (mdl_handler.ensure_locked(dbname) ||
thd->dd_client()->acquire(dbname, &schema))
return true;
if (schema == nullptr) {
my_error(ER_BAD_DB_ERROR, MYF(0), dbname);
return true;
}
if (get_default_db_collation(*schema, &create.default_table_charset)) {
DBUG_ASSERT(thd->is_error() || thd->killed);
return true;
}
if (create.default_table_charset == NULL)
create.default_table_charset = thd->collation();
is_encrypted_schema = schema->default_encryption();
}
List<Item> field_list;
field_list.push_back(new Item_empty_string("Database", NAME_CHAR_LEN));
field_list.push_back(new Item_empty_string("Create Database", 1024));
if (thd->send_result_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
return true;
protocol->start_row();
protocol->store_string(orig_dbname, strlen(orig_dbname), system_charset_info);
buffer.length(0);
buffer.append(STRING_WITH_LEN("CREATE DATABASE "));
if (create_options & HA_LEX_CREATE_IF_NOT_EXISTS)
buffer.append(STRING_WITH_LEN("/*!32312 IF NOT EXISTS*/ "));
append_identifier(thd, &buffer, orig_dbname, strlen(orig_dbname));
if (create.default_table_charset) {
buffer.append(STRING_WITH_LEN(" /*!40100"));
buffer.append(STRING_WITH_LEN(" DEFAULT CHARACTER SET "));
buffer.append(create.default_table_charset->csname);
if (!(create.default_table_charset->state & MY_CS_PRIMARY) ||
create.default_table_charset == &my_charset_utf8mb4_0900_ai_ci) {
buffer.append(STRING_WITH_LEN(" COLLATE "));
buffer.append(create.default_table_charset->name);
}
buffer.append(STRING_WITH_LEN(" */"));
}
buffer.append(STRING_WITH_LEN(" /*!80016"));
buffer.append(STRING_WITH_LEN(" DEFAULT ENCRYPTION="));
if (is_encrypted_schema)
buffer.append(STRING_WITH_LEN("'Y'"));
else
buffer.append(STRING_WITH_LEN("'N'"));
buffer.append(STRING_WITH_LEN(" */"));
protocol->store_string(buffer.ptr(), buffer.length(), buffer.charset());
if (protocol->end_row()) return true;
my_eof(thd);
return false;
}
/****************************************************************************
Return only fields for API mysql_list_fields
Use "show table wildcard" in mysql instead of this
****************************************************************************/
void mysqld_list_fields(THD *thd, TABLE_LIST *table_list, const char *wild) {
DBUG_TRACE;
DBUG_PRINT("enter", ("table: %s", table_list->table_name));
if (open_tables_for_query(thd, table_list,
MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL))
return;
if (table_list->is_view_or_derived()) {
// Setup materialized result table so that we can read the column list
if (table_list->resolve_derived(thd, false))
return; /* purecov: inspected */
if (table_list->setup_materialized_derived(thd))
return; /* purecov: inspected */
}
TABLE *table = table_list->table;
List<Item> field_list;
Field **ptr, *field;
for (ptr = table->field; (field = *ptr); ptr++) {
if (!wild || !wild[0] ||
!wild_case_compare(system_charset_info, field->field_name, wild)) {
Item *item;
if (table_list->is_view()) {
item = new Item_ident_for_show(field, table_list->view_db.str,
table_list->view_name.str);
(void)item->fix_fields(thd, NULL);
} else {
item = new Item_field(field);
}
field_list.push_back(item);
}
}
restore_record(table, s->default_values); // Get empty record
table->use_all_columns();
if (thd->send_result_metadata(&field_list, Protocol::SEND_DEFAULTS)) return;
my_eof(thd);
}
/*
Go through all character combinations and ensure that sql_lex.cc can
parse it as an identifier.
SYNOPSIS
require_quotes()
name attribute name
name_length length of name
RETURN
# Pointer to conflicting character
0 No conflicting character
*/
static const char *require_quotes(const char *name, size_t name_length) {
bool pure_digit = true;
const char *end = name + name_length;
for (; name < end; name++) {
uchar chr = (uchar)*name;
uint length = my_mbcharlen(system_charset_info, chr);
if (length == 0 || (length == 1 && !system_charset_info->ident_map[chr]))
return name;
if (length == 1 && (chr < '0' || chr > '9')) pure_digit = false;
}
if (pure_digit) return name;
return 0;
}
/**
Convert and quote the given identifier if needed and append it to the
target string. If the given identifier is empty, it will be quoted.
This function always use the backtick as escape char and thus rid itself
of the THD dependency.
@param packet target string
@param name the identifier to be appended
@param length length of the appending identifier
*/
void append_identifier(String *packet, const char *name, size_t length) {
const char *name_end;
char quote_char = '`';
const CHARSET_INFO *cs_info = system_charset_info;
const char *to_name = name;
size_t to_length = length;
/*
The identifier must be quoted as it includes a quote character or
it's a keyword
*/
(void)packet->reserve(to_length * 2 + 2);
packet->append(&quote_char, 1, system_charset_info);
for (name_end = to_name + to_length; to_name < name_end;
to_name += to_length) {
uchar chr = static_cast<uchar>(*to_name);
to_length = my_mbcharlen(cs_info, chr);
/*
my_mbcharlen can return 0 on a wrong multibyte
sequence. It is possible when upgrading from 4.0,
and identifier contains some accented characters.
The manual says it does not work. So we'll just
change length to 1 not to hang in the endless loop.
*/
if (!to_length) to_length = 1;
if (to_length == 1 && chr == static_cast<uchar>(quote_char))
packet->append(&quote_char, 1, system_charset_info);
packet->append(to_name, to_length, system_charset_info);
}
packet->append(&quote_char, 1, system_charset_info);
}
/**
Convert and quote the given identifier if needed and append it to the
target string. If the given identifier is empty, it will be quoted.
@param thd thread handler
@param packet target string
@param name the identifier to be appended
@param length length of the appending identifier
@param from_cs Charset information about the input string
@param to_cs Charset information about the target string
*/
void append_identifier(const THD *thd, String *packet, const char *name,
size_t length, const CHARSET_INFO *from_cs,
const CHARSET_INFO *to_cs) {
const char *name_end;
char quote_char;
int q;
const CHARSET_INFO *cs_info = system_charset_info;
const char *to_name = name;
size_t to_length = length;
String to_string(name, length, from_cs);
if (from_cs != NULL && to_cs != NULL && from_cs != to_cs) {
uint dummy_errors;
StringBuffer<MAX_FIELD_WIDTH> convert_buffer;
convert_buffer.copy(to_string.ptr(), to_string.length(), from_cs, to_cs,
&dummy_errors);
to_string.copy(convert_buffer);
}
if (to_cs != NULL) {
to_name = to_string.c_ptr();
to_length = to_string.length();
cs_info = to_cs;
}
q = thd != NULL ? get_quote_char_for_identifier(thd, to_name, to_length)
: '`';
if (q == EOF) {
packet->append(to_name, to_length, packet->charset());
return;
}
/*
The identifier must be quoted as it includes a quote character or
it's a keyword
*/
(void)packet->reserve(to_length * 2 + 2);
quote_char = (char)q;
packet->append(&quote_char, 1, system_charset_info);
for (name_end = to_name + to_length; to_name < name_end;
to_name += to_length) {
uchar chr = static_cast<uchar>(*to_name);
to_length = my_mbcharlen(cs_info, chr);
/*
my_mbcharlen can return 0 on a wrong multibyte
sequence. It is possible when upgrading from 4.0,
and identifier contains some accented characters.
The manual says it does not work. So we'll just
change length to 1 not to hang in the endless loop.
*/
if (!to_length) to_length = 1;
if (to_length == 1 && chr == static_cast<uchar>(quote_char))
packet->append(&quote_char, 1, system_charset_info);
packet->append(to_name, to_length, system_charset_info);
}
packet->append(&quote_char, 1, system_charset_info);
}
/*
Get the quote character for displaying an identifier.
SYNOPSIS
get_quote_char_for_identifier()
thd Thread handler
name name to quote
length length of name
IMPLEMENTATION
Force quoting in the following cases:
- name is empty (for one, it is possible when we use this function for
quoting user and host names for DEFINER clause);
- name is a keyword;
- name includes a special character;
Otherwise identifier is quoted only if the option OPTION_QUOTE_SHOW_CREATE
is set.
RETURN
EOF No quote character is needed
# Quote character
*/
int get_quote_char_for_identifier(const THD *thd, const char *name,
size_t length) {
if (length && !is_keyword(name, length) && !require_quotes(name, length) &&
!(thd->variables.option_bits & OPTION_QUOTE_SHOW_CREATE))
return EOF;
if (thd->variables.sql_mode & MODE_ANSI_QUOTES) return '"';
return '`';
}
void append_identifier(const THD *thd, String *packet, const char *name,
size_t length) {
if (thd == 0)
append_identifier(packet, name, length);
else
append_identifier(thd, packet, name, length, NULL, NULL);
}
/* Append directory name (if exists) to CREATE INFO */
static void append_directory(THD *thd, String *packet, const char *dir_type,
const char *filename) {
if (filename && !(thd->variables.sql_mode & MODE_NO_DIR_IN_CREATE)) {
size_t length = dirname_length(filename);
packet->append(' ');
packet->append(dir_type);
packet->append(STRING_WITH_LEN(" DIRECTORY='"));
#ifdef _WIN32
/* Convert \ to / to be able to create table on unix */
char *winfilename = (char *)thd->memdup(filename, length);
char *pos, *end;
for (pos = winfilename, end = pos + length; pos < end; pos++) {
if (*pos == '\\') *pos = '/';
}
filename = winfilename;
#endif
packet->append(filename, length);
packet->append('\'');
}
}
/**
Print "ON UPDATE" clause of a field into a string.
@param field The field to generate ON UPDATE clause for.
@param val
@param lcase Whether to print in lower case.
@return false on success, true on error.
*/
static bool print_on_update_clause(Field *field, String *val, bool lcase) {
DBUG_ASSERT(val->charset()->mbminlen == 1);
val->length(0);
if (field->has_update_default_datetime_value_expression()) {
if (lcase)
val->copy(STRING_WITH_LEN("on update "), val->charset());
else
val->copy(STRING_WITH_LEN("ON UPDATE "), val->charset());
val->append(STRING_WITH_LEN("CURRENT_TIMESTAMP"));
if (field->decimals() > 0) val->append_parenthesized(field->decimals());
return true;
}
return false;
}
static bool print_default_clause(THD *thd, Field *field, String *def_value,
bool quoted) {
enum enum_field_types field_type = field->type();
const bool has_default = (!(field->flags & NO_DEFAULT_VALUE_FLAG) &&
!(field->auto_flags & Field::NEXT_NUMBER));
if (field->gcol_info) return false;
def_value->length(0);
if (has_default) {
if (field->has_insert_default_general_value_expression()) {
def_value->append("(");
char buffer[128];
String s(buffer, sizeof(buffer), system_charset_info);
field->m_default_val_expr->print_expr(thd, &s);
def_value->append(s);
def_value->append(")");
} else if (field->has_insert_default_datetime_value_expression()) {
/*
We are using CURRENT_TIMESTAMP instead of NOW because it is the SQL
standard.
*/
def_value->append(STRING_WITH_LEN("CURRENT_TIMESTAMP"));
if (field->decimals() > 0)
def_value->append_parenthesized(field->decimals());
// Not null by default and not a BLOB
} else if (!field->is_null() && field_type != FIELD_TYPE_BLOB) {
char tmp[MAX_FIELD_WIDTH];
String type(tmp, sizeof(tmp), field->charset());
if (field_type == MYSQL_TYPE_BIT) {
longlong dec = field->val_int();
char *ptr = longlong2str(dec, tmp + 2, 2);
uint32 length = (uint32)(ptr - tmp);
tmp[0] = 'b';
tmp[1] = '\'';
tmp[length] = '\'';
type.length(length + 1);
quoted = 0;
} else
field->val_str(&type);
if (type.length()) {
String def_val;
uint dummy_errors;
/* convert to system_charset_info == utf8 */
def_val.copy(type.ptr(), type.length(), field->charset(),
system_charset_info, &dummy_errors);
if (quoted)
append_unescaped(def_value, def_val.ptr(), def_val.length());
else
def_value->append(def_val.ptr(), def_val.length());
} else if (quoted)
def_value->append(STRING_WITH_LEN("''"));
} else if (field->maybe_null() && quoted && field_type != FIELD_TYPE_BLOB)
def_value->append(STRING_WITH_LEN("NULL")); // Null as default
else
return false;
}
return has_default;
}
/*
Check if we should print encryption clause. We always show explicit
ENCRYPTION clause, OR if table's schema has default encryption enabled.
@param thd The thread
@param share Represents table share metadata.
@param *print [out] Point to out param.
@returns true if ENCRYPTION clause should be printed, else false.
*/
static bool should_print_encryption_clause(THD *thd, TABLE_SHARE *share,
bool *print) {
// Don't print for temporary
if (share->tmp_table) {
*print = false;
return false;
}
// Find schema encryption default.
dd::Schema_MDL_locker mdl_handler(thd);
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
const dd::Schema *schema = nullptr;
if (mdl_handler.ensure_locked(share->db.str) ||
thd->dd_client()->acquire(share->db.str, &schema))
return true;
if (schema == nullptr) {
my_error(ER_BAD_DB_ERROR, MYF(0), share->db.str);
return true;
}
// Decide if we need to print the clause.
bool table_is_encrypted = dd::is_encrypted(share->encrypt_type);
*print = table_is_encrypted ||
(schema->default_encryption() != table_is_encrypted);
return false;
}
/**
Build a CREATE TABLE statement for a table.
@param thd The thread
@param table_list A list containing one table to write statement for.
@param packet Pointer to a string where statement will be written.
@param create_info_arg Pointer to create information that can be used to
tailor the format of the statement. Can be NULL,
in which case only SQL_MODE is considered when
building the statement.
@param show_database If true, then print the database before the table
name. The database name is only printed in the event
that it is different from the current database.
If false, then do not print the database before
the table name.
@returns true if error, false otherwise.
*/
bool store_create_info(THD *thd, TABLE_LIST *table_list, String *packet,
HA_CREATE_INFO *create_info_arg, bool show_database) {
char tmp[MAX_FIELD_WIDTH], *for_str, buff[128],
def_value_buf[MAX_FIELD_WIDTH];
const char *alias;
String type(tmp, sizeof(tmp), system_charset_info);
String def_value(def_value_buf, sizeof(def_value_buf), system_charset_info);
Field **ptr, *field;
uint primary_key;
KEY *key_info;
TABLE *table = table_list->table;
handler *file = table->file;
TABLE_SHARE *share = table->s;
HA_CREATE_INFO create_info;
bool show_table_options = false;
bool foreign_db_mode = (thd->variables.sql_mode & MODE_ANSI) != 0;
my_bitmap_map *old_map;
bool error = false;
DBUG_TRACE;
DBUG_PRINT("enter", ("table: %s", table->s->table_name.str));
restore_record(table, s->default_values); // Get empty record
if (share->tmp_table)
packet->append(STRING_WITH_LEN("CREATE TEMPORARY TABLE "));
else
packet->append(STRING_WITH_LEN("CREATE TABLE "));
if (create_info_arg &&
(create_info_arg->options & HA_LEX_CREATE_IF_NOT_EXISTS))
packet->append(STRING_WITH_LEN("IF NOT EXISTS "));
if (table_list->schema_table)
alias = table_list->schema_table->table_name;
else {
if (lower_case_table_names == 2)
alias = table->alias;
else {
alias = share->table_name.str;
}
}
/*
Print the database before the table name if told to do that. The
database name is only printed in the event that it is different
from the current database. The main reason for doing this is to
avoid having to update gazillions of tests and result files, but
it also saves a few bytes of the binary log.
*/
if (show_database) {
const LEX_CSTRING *const db =
table_list->schema_table ? &INFORMATION_SCHEMA_NAME : &table->s->db;
if (!thd->db().str || strcmp(db->str, thd->db().str)) {
append_identifier(thd, packet, db->str, db->length);
packet->append(STRING_WITH_LEN("."));
}
}
append_identifier(thd, packet, alias, strlen(alias));
packet->append(STRING_WITH_LEN(" (\n"));
/*
We need this to get default values from the table
We have to restore the read_set if we are called from insert in case
of row based replication.
*/
old_map = tmp_use_all_columns(table, table->read_set);
auto grd = create_scope_guard(
[&]() { tmp_restore_column_map(table->read_set, old_map); });
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
const dd::Table *table_obj = nullptr;
if (share->tmp_table)
table_obj = table->s->tmp_table_def;
else {
if (thd->dd_client()->acquire(dd::String_type(share->db.str),
dd::String_type(share->table_name.str),
&table_obj))
return true;
DBUG_EXECUTE_IF("sim_acq_fail_in_store_ci", {
my_error(ER_DA_UNKNOWN_ERROR_NUMBER, MYF(0), 42);
return true;
});
}
for (ptr = table->field; (field = *ptr); ptr++) {
// Skip fields that are hidden from the user.
if (field->is_hidden_from_user()) continue;
uint flags = field->flags;
enum_field_types field_type = field->real_type();
if (ptr != table->field) packet->append(STRING_WITH_LEN(",\n"));
packet->append(STRING_WITH_LEN(" "));
append_identifier(thd, packet, field->field_name,
strlen(field->field_name));
packet->append(' ');
// check for surprises from the previous call to Field::sql_type()
if (type.ptr() != tmp)
type.set(tmp, sizeof(tmp), system_charset_info);
else
type.set_charset(system_charset_info);
field->sql_type(type);
/*
If the session variable 'show_old_temporals' is enabled and the field
is a temporal type of old format, add a comment to indicate the same.
*/
if (thd->variables.show_old_temporals &&
(field_type == MYSQL_TYPE_TIME || field_type == MYSQL_TYPE_DATETIME ||
field_type == MYSQL_TYPE_TIMESTAMP))
type.append(" /* 5.5 binary format */");
packet->append(type.ptr(), type.length(), system_charset_info);
bool column_has_explicit_collation = false;
/* We may not have a table_obj for schema_tables. */
if (table_obj)
column_has_explicit_collation =
table_obj->get_column(field->field_name)->is_explicit_collation();
if (field->has_charset()) {
/*
For string types dump charset name only if field charset is same as
table charset or was explicitly assigned.
*/
if (field->charset() != share->table_charset ||
column_has_explicit_collation) {
packet->append(STRING_WITH_LEN(" CHARACTER SET "));
packet->append(field->charset()->csname);
}
/*
For string types dump collation name only if
collation is not primary for the given charset
or was explicitly assigned.
*/
if (!(field->charset()->state & MY_CS_PRIMARY) ||
column_has_explicit_collation ||
(field->charset() == &my_charset_utf8mb4_0900_ai_ci &&
share->table_charset != &my_charset_utf8mb4_0900_ai_ci)) {
packet->append(STRING_WITH_LEN(" COLLATE "));
packet->append(field->charset()->name);
}
}
if (field->gcol_info) {
packet->append(STRING_WITH_LEN(" GENERATED ALWAYS"));
packet->append(STRING_WITH_LEN(" AS ("));
char buffer[128];
String s(buffer, sizeof(buffer), system_charset_info);
field->gcol_info->print_expr(thd, &s);
packet->append(s);
packet->append(STRING_WITH_LEN(")"));
if (field->stored_in_db)
packet->append(STRING_WITH_LEN(" STORED"));
else
packet->append(STRING_WITH_LEN(" VIRTUAL"));
}
if (flags & NOT_NULL_FLAG)
packet->append(STRING_WITH_LEN(" NOT NULL"));
else if (field->type() == MYSQL_TYPE_TIMESTAMP) {
/*
TIMESTAMP field require explicit NULL flag, because unlike
all other fields they are treated as NOT NULL by default.
*/
packet->append(STRING_WITH_LEN(" NULL"));
}
if (flags & NOT_SECONDARY_FLAG)
packet->append(STRING_WITH_LEN(" NOT SECONDARY"));
if (field->type() == MYSQL_TYPE_GEOMETRY) {
const Field_geom *field_geom = down_cast<const Field_geom *>(field);
if (field_geom->get_srid().has_value()) {
packet->append(STRING_WITH_LEN(" /*!80003 SRID "));
packet->append_ulonglong(field_geom->get_srid().value());
packet->append(STRING_WITH_LEN(" */"));
}
}
switch (field->field_storage_type()) {
case HA_SM_DEFAULT:
break;
case HA_SM_DISK:
packet->append(STRING_WITH_LEN(" /*!50606 STORAGE DISK */"));
break;
case HA_SM_MEMORY:
packet->append(STRING_WITH_LEN(" /*!50606 STORAGE MEMORY */"));
break;
default:
DBUG_ASSERT(0);
break;
}
switch (field->column_format()) {
case COLUMN_FORMAT_TYPE_DEFAULT:
break;
case COLUMN_FORMAT_TYPE_FIXED:
packet->append(STRING_WITH_LEN(" /*!50606 COLUMN_FORMAT FIXED */"));
break;
case COLUMN_FORMAT_TYPE_DYNAMIC:
packet->append(STRING_WITH_LEN(" /*!50606 COLUMN_FORMAT DYNAMIC */"));
break;
default:
DBUG_ASSERT(0);
break;
}
if (print_default_clause(thd, field, &def_value, true)) {
packet->append(STRING_WITH_LEN(" DEFAULT "));
packet->append(def_value.ptr(), def_value.length(), system_charset_info);
}
if (print_on_update_clause(field, &def_value, false)) {
packet->append(STRING_WITH_LEN(" "));
packet->append(def_value);
}
if (field->auto_flags & Field::NEXT_NUMBER)
packet->append(STRING_WITH_LEN(" AUTO_INCREMENT"));
if (field->comment.length) {
packet->append(STRING_WITH_LEN(" COMMENT "));
append_unescaped(packet, field->comment.str, field->comment.length);
}
}
key_info = table->key_info;
/* Allow update_create_info to update row type */
create_info.row_type = share->row_type;
file->update_create_info(&create_info);
primary_key = share->primary_key;
for (uint i = 0; i < share->keys; i++, key_info++) {
KEY_PART_INFO *key_part = key_info->key_part;
bool found_primary = 0;
packet->append(STRING_WITH_LEN(",\n "));
if (i == primary_key && !strcmp(key_info->name, primary_key_name)) {
found_primary = 1;
/*
No space at end, because a space will be added after where the
identifier would go, but that is not added for primary key.
*/
packet->append(STRING_WITH_LEN("PRIMARY KEY"));
} else if (key_info->flags & HA_NOSAME)
packet->append(STRING_WITH_LEN("UNIQUE KEY "));
else if (key_info->flags & HA_FULLTEXT)
packet->append(STRING_WITH_LEN("FULLTEXT KEY "));
else if (key_info->flags & HA_SPATIAL)
packet->append(STRING_WITH_LEN("SPATIAL KEY "));
else
packet->append(STRING_WITH_LEN("KEY "));
if (!found_primary)
append_identifier(thd, packet, key_info->name, strlen(key_info->name));
packet->append(STRING_WITH_LEN(" ("));
for (uint j = 0; j < key_info->user_defined_key_parts; j++, key_part++) {
if (j) packet->append(',');
if (key_part->field) {
// If this fields represents a functional index, print the expression
// instead of the column name.
if (key_part->field->is_field_for_functional_index()) {
DBUG_ASSERT(key_part->field->gcol_info);
StringBuffer<STRING_BUFFER_USUAL_SIZE> s;
s.set_charset(system_charset_info);
key_part->field->gcol_info->print_expr(thd, &s);
packet->append("(");
packet->append(s);
packet->append(")");
} else {
append_identifier(thd, packet, key_part->field->field_name,
strlen(key_part->field->field_name));
}
}
if (key_part->field &&
(key_part->length !=
table->field[key_part->fieldnr - 1]->key_length() &&
!(key_info->flags & (HA_FULLTEXT | HA_SPATIAL)))) {
packet->append_parenthesized((long)key_part->length /
key_part->field->charset()->mbmaxlen);
}
if (key_part->key_part_flag & HA_REVERSE_SORT)
packet->append(STRING_WITH_LEN(" DESC"));
}
packet->append(')');
store_key_options(thd, packet, table, key_info);
if (key_info->parser) {
LEX_CSTRING *parser_name = plugin_name(key_info->parser);
packet->append(STRING_WITH_LEN(" /*!50100 WITH PARSER "));
append_identifier(thd, packet, parser_name->str, parser_name->length);
packet->append(STRING_WITH_LEN(" */ "));
}
}
/*
Get possible foreign key definitions stored in InnoDB and append them
to the CREATE TABLE statement
*/
if ((for_str = file->get_foreign_key_create_info())) {
packet->append(for_str, strlen(for_str));
file->free_foreign_key_create_info(for_str);
}
/*
Append check constraints to the CREATE TABLE statement. All check
constraints are listed in table check constraint form.
*/
if (table->table_check_constraint_list != nullptr) {
for (auto &cc : *table->table_check_constraint_list) {
packet->append(STRING_WITH_LEN(",\n "));
packet->append(STRING_WITH_LEN("CONSTRAINT "));
append_identifier(thd, packet, cc->name().str, cc->name().length);
packet->append(STRING_WITH_LEN(" CHECK ("));
packet->append(cc->expr_str().str, cc->expr_str().length,
system_charset_info);
packet->append(STRING_WITH_LEN(")"));
/*
If check constraint is not-enforced then it is listed with the comment
"NOT ENFORCED".
*/
if (!cc->is_enforced()) {
packet->append(STRING_WITH_LEN(" /*!80016 NOT ENFORCED */"));
}
}
}
packet->append(STRING_WITH_LEN("\n)"));
bool show_tablespace = false;
if (!foreign_db_mode) {
show_table_options = true;
// Show tablespace name only if it is explicitly provided by user.
if (share->tmp_table) {
// Innodb allows temporary tables in be in system temporary tablespace.
show_tablespace = share->tablespace;
} else if (share->tablespace && table_obj) {
show_tablespace = table_obj->is_explicit_tablespace();
}
/* TABLESPACE and STORAGE */
if (show_tablespace || share->default_storage_media != HA_SM_DEFAULT) {
packet->append(STRING_WITH_LEN(" /*!50100"));
if (show_tablespace) {
packet->append(STRING_WITH_LEN(" TABLESPACE "));
append_identifier(thd, packet, share->tablespace,
strlen(share->tablespace));
}
if (share->default_storage_media == HA_SM_DISK)
packet->append(STRING_WITH_LEN(" STORAGE DISK"));
if (share->default_storage_media == HA_SM_MEMORY)
packet->append(STRING_WITH_LEN(" STORAGE MEMORY"));
packet->append(STRING_WITH_LEN(" */"));
}
/*
IF check_create_info
THEN add ENGINE only if it was used when creating the table
*/
if (!create_info_arg ||
(create_info_arg->used_fields & HA_CREATE_USED_ENGINE)) {
packet->append(STRING_WITH_LEN(" ENGINE="));
/*
TODO: Replace this if with the else branch. Not done yet since
NDB handlerton says "ndbcluster" and ha_ndbcluster says "NDBCLUSTER".
*/
if (table->part_info) {
packet->append(ha_resolve_storage_engine_name(
table->part_info->default_engine_type));
} else {
packet->append(file->table_type());
}
}
/*
Add AUTO_INCREMENT=... if there is an AUTO_INCREMENT column,
and NEXT_ID > 1 (the default). We must not print the clause
for engines that do not support this as it would break the
import of dumps, but as of this writing, the test for whether
AUTO_INCREMENT columns are allowed and wether AUTO_INCREMENT=...
is supported is identical, !(file->table_flags() & HA_NO_AUTO_INCREMENT))
Because of that, we do not explicitly test for the feature,
but may extrapolate its existence from that of an AUTO_INCREMENT column.
*/
if (create_info.auto_increment_value > 1) {
char *end;
packet->append(STRING_WITH_LEN(" AUTO_INCREMENT="));
end = longlong10_to_str(create_info.auto_increment_value, buff, 10);
packet->append(buff, (uint)(end - buff));
}
if (share->table_charset) {
/*
IF check_create_info
THEN add DEFAULT CHARSET only if it was used when creating the table
*/
if (!create_info_arg ||
(create_info_arg->used_fields & HA_CREATE_USED_DEFAULT_CHARSET)) {
packet->append(STRING_WITH_LEN(" DEFAULT CHARSET="));
packet->append(share->table_charset->csname);
if (!(share->table_charset->state & MY_CS_PRIMARY) ||
share->table_charset == &my_charset_utf8mb4_0900_ai_ci) {
packet->append(STRING_WITH_LEN(" COLLATE="));
packet->append(table->s->table_charset->name);
}
}
}
if (share->min_rows) {
char *end;
packet->append(STRING_WITH_LEN(" MIN_ROWS="));
end = longlong10_to_str(share->min_rows, buff, 10);
packet->append(buff, (uint)(end - buff));
}
if (share->max_rows && !table_list->schema_table) {
char *end;
packet->append(STRING_WITH_LEN(" MAX_ROWS="));
end = longlong10_to_str(share->max_rows, buff, 10);
packet->append(buff, (uint)(end - buff));
}
if (share->avg_row_length) {
char *end;
packet->append(STRING_WITH_LEN(" AVG_ROW_LENGTH="));
end = longlong10_to_str(share->avg_row_length, buff, 10);
packet->append(buff, (uint)(end - buff));
}
if (share->db_create_options & HA_OPTION_PACK_KEYS)
packet->append(STRING_WITH_LEN(" PACK_KEYS=1"));
if (share->db_create_options & HA_OPTION_NO_PACK_KEYS)
packet->append(STRING_WITH_LEN(" PACK_KEYS=0"));
if (share->db_create_options & HA_OPTION_STATS_PERSISTENT)
packet->append(STRING_WITH_LEN(" STATS_PERSISTENT=1"));
if (share->db_create_options & HA_OPTION_NO_STATS_PERSISTENT)
packet->append(STRING_WITH_LEN(" STATS_PERSISTENT=0"));
if (share->stats_auto_recalc == HA_STATS_AUTO_RECALC_ON)
packet->append(STRING_WITH_LEN(" STATS_AUTO_RECALC=1"));
else if (share->stats_auto_recalc == HA_STATS_AUTO_RECALC_OFF)
packet->append(STRING_WITH_LEN(" STATS_AUTO_RECALC=0"));
if (share->stats_sample_pages != 0) {
char *end;
packet->append(STRING_WITH_LEN(" STATS_SAMPLE_PAGES="));
end = longlong10_to_str(share->stats_sample_pages, buff, 10);
packet->append(buff, (uint)(end - buff));
}
/* We use CHECKSUM, instead of TABLE_CHECKSUM, for backward compability */
if (share->db_create_options & HA_OPTION_CHECKSUM)
packet->append(STRING_WITH_LEN(" CHECKSUM=1"));
if (share->db_create_options & HA_OPTION_DELAY_KEY_WRITE)
packet->append(STRING_WITH_LEN(" DELAY_KEY_WRITE=1"));
/*
If 'show_create_table_verbosity' is enabled, the row format would
be displayed in the output of SHOW CREATE TABLE even if default
row format is used. Otherwise only the explicitly mentioned
row format would be displayed.
*/
if (thd->variables.show_create_table_verbosity) {
packet->append(STRING_WITH_LEN(" ROW_FORMAT="));
packet->append(ha_row_type[(uint)share->real_row_type]);
} else if (create_info.row_type != ROW_TYPE_DEFAULT) {
packet->append(STRING_WITH_LEN(" ROW_FORMAT="));
packet->append(ha_row_type[(uint)create_info.row_type]);
}
if (table->s->key_block_size) {
char *end;
packet->append(STRING_WITH_LEN(" KEY_BLOCK_SIZE="));
end = longlong10_to_str(table->s->key_block_size, buff, 10);
packet->append(buff, (uint)(end - buff));
}
if (table->s->compress.length) {
packet->append(STRING_WITH_LEN(" COMPRESSION="));
append_unescaped(packet, share->compress.str, share->compress.length);
}
bool print_encryption = false;
if (should_print_encryption_clause(thd, share, &print_encryption))
return true;
if (print_encryption) {
/*
Add versioned comment when there is TABLESPACE clause displayed and
the table uses general tablespace.
*/
bool uses_general_tablespace = false;
if (table_obj)
uses_general_tablespace =
show_tablespace && dd::uses_general_tablespace(*table_obj);
if (uses_general_tablespace) packet->append(STRING_WITH_LEN(" /*!80016"));
packet->append(STRING_WITH_LEN(" ENCRYPTION="));
if (share->encrypt_type.length) {
append_unescaped(packet, share->encrypt_type.str,
share->encrypt_type.length);
} else {
/*
We print ENCRYPTION='N' only incase user did not explicitly
provide ENCRYPTION clause and schema has default_encryption 'Y'.
In other words, if there is no ENCRYPTION clause supplied, then
it is always unencrypted table. Server always maintains
ENCRYPTION clause for encrypted tables, even if user did not
supply the clause explicitly.
*/
packet->append(STRING_WITH_LEN("\'N\'"));
}
if (uses_general_tablespace) packet->append(STRING_WITH_LEN(" */"));
}
table->file->append_create_info(packet);
if (share->comment.length) {
packet->append(STRING_WITH_LEN(" COMMENT="));
append_unescaped(packet, share->comment.str, share->comment.length);
}
if (share->connect_string.length) {
packet->append(STRING_WITH_LEN(" CONNECTION="));
append_unescaped(packet, share->connect_string.str,
share->connect_string.length);
}
if (share->has_secondary_engine() &&
!thd->variables.show_create_table_skip_secondary_engine) {
packet->append(" SECONDARY_ENGINE=");
packet->append(share->secondary_engine.str,
share->secondary_engine.length);
}
append_directory(thd, packet, "DATA", create_info.data_file_name);
append_directory(thd, packet, "INDEX", create_info.index_file_name);
}
{
if (table->part_info &&
!(table->s->db_type()->partition_flags &&
(table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION) &&
table->part_info->is_auto_partitioned)) {
/*
Partition syntax for CREATE TABLE is at the end of the syntax.
*/
uint part_syntax_len;
char *part_syntax;
String comment_start;
table->part_info->set_show_version_string(&comment_start);
if ((part_syntax = generate_partition_syntax(
table->part_info, &part_syntax_len, false, show_table_options,
true, // For proper quoting.
comment_start.c_ptr()))) {
packet->append(comment_start);
if (packet->append(part_syntax, part_syntax_len) ||
packet->append(STRING_WITH_LEN(" */")))
error = true;
my_free(part_syntax);
}
}
}
return error;
}
static void store_key_options(THD *thd, String *packet, TABLE *table,
KEY *key_info) {
bool foreign_db_mode = (thd->variables.sql_mode & MODE_ANSI) != 0;
char *end, buff[32];
if (!foreign_db_mode) {
/*
Send USING clause only if key algorithm was explicitly specified
at the table creation time.
*/
if (key_info->is_algorithm_explicit) {
if (key_info->algorithm == HA_KEY_ALG_BTREE)
packet->append(STRING_WITH_LEN(" USING BTREE"));
if (key_info->algorithm == HA_KEY_ALG_HASH)
packet->append(STRING_WITH_LEN(" USING HASH"));
if (key_info->algorithm == HA_KEY_ALG_RTREE) {
/* We should send USING only in non-default case: non-spatial rtree. */
DBUG_ASSERT(!(key_info->flags & HA_SPATIAL));
packet->append(STRING_WITH_LEN(" USING RTREE"));
}
}
if ((key_info->flags & HA_USES_BLOCK_SIZE) &&
table->s->key_block_size != key_info->block_size) {
packet->append(STRING_WITH_LEN(" KEY_BLOCK_SIZE="));
end = longlong10_to_str(key_info->block_size, buff, 10);
packet->append(buff, (uint)(end - buff));
}
DBUG_ASSERT(MY_TEST(key_info->flags & HA_USES_COMMENT) ==
(key_info->comment.length > 0));
if (key_info->flags & HA_USES_COMMENT) {
packet->append(STRING_WITH_LEN(" COMMENT "));
append_unescaped(packet, key_info->comment.str, key_info->comment.length);
}
if (!key_info->is_visible)
packet->append(STRING_WITH_LEN(" /*!80000 INVISIBLE */"));
}
}
void view_store_options(const THD *thd, TABLE_LIST *table, String *buff) {
append_algorithm(table, buff);
append_definer(thd, buff, table->definer.user, table->definer.host);
if (table->view_suid)
buff->append(STRING_WITH_LEN("SQL SECURITY DEFINER "));
else
buff->append(STRING_WITH_LEN("SQL SECURITY INVOKER "));
}
/**
Append ALGORITHM clause to the given buffer.
@param table VIEW definition
@param [in,out] buff buffer to hold ALGORITHM clause
*/
static void append_algorithm(TABLE_LIST *table, String *buff) {
buff->append(STRING_WITH_LEN("ALGORITHM="));
switch ((int8)table->algorithm) {
case VIEW_ALGORITHM_UNDEFINED:
buff->append(STRING_WITH_LEN("UNDEFINED "));
break;
case VIEW_ALGORITHM_TEMPTABLE:
buff->append(STRING_WITH_LEN("TEMPTABLE "));
break;
case VIEW_ALGORITHM_MERGE:
buff->append(STRING_WITH_LEN("MERGE "));
break;
default:
DBUG_ASSERT(0); // never should happen
}
}
/**
Append DEFINER clause to the given buffer.
@param thd thread handle
@param [in,out] buffer buffer to hold DEFINER clause
@param definer_user user name part of definer
@param definer_host host name part of definer
*/
void append_definer(const THD *thd, String *buffer,
const LEX_CSTRING &definer_user,
const LEX_CSTRING &definer_host) {
buffer->append(STRING_WITH_LEN("DEFINER="));
append_identifier(thd, buffer, definer_user.str, definer_user.length);
buffer->append('@');
append_identifier(thd, buffer, definer_host.str, definer_host.length);
buffer->append(' ');
}
static void view_store_create_info(const THD *thd, TABLE_LIST *table,
String *buff) {
bool foreign_db_mode = (thd->variables.sql_mode & MODE_ANSI) != 0;
// Print compact view name if the view belongs to the current database
bool compact_view_name =
thd->db().str != NULL && (!strcmp(thd->db().str, table->view_db.str));
buff->append(STRING_WITH_LEN("CREATE "));
if (!foreign_db_mode) {
view_store_options(thd, table, buff);
}
buff->append(STRING_WITH_LEN("VIEW "));
if (!compact_view_name) {
append_identifier(thd, buff, table->view_db.str, table->view_db.length);
buff->append('.');
}
append_identifier(thd, buff, table->view_name.str, table->view_name.length);
print_derived_column_names(thd, buff, table->derived_column_names());
buff->append(STRING_WITH_LEN(" AS "));
/*
We can't just use table->query, because our SQL_MODE may trigger
a different syntax, like when ANSI_QUOTES is defined.
Append the db name only if it is not the same as connection's
database.
*/
table->view_query()->unit->print(
thd, buff, enum_query_type(QT_TO_ARGUMENT_CHARSET | QT_NO_DEFAULT_DB));
if (table->with_check != VIEW_CHECK_NONE) {
if (table->with_check == VIEW_CHECK_LOCAL)
buff->append(STRING_WITH_LEN(" WITH LOCAL CHECK OPTION"));
else
buff->append(STRING_WITH_LEN(" WITH CASCADED CHECK OPTION"));
}
}
/****************************************************************************
Return info about all processes
returns for each thread: thread id, user, host, db, command, info
****************************************************************************/
class thread_info {
public:
thread_info()
: thread_id(0),
start_time_in_secs(0),
command(0),
user(NULL),
host(NULL),
db(NULL),
proc_info(NULL),
state_info(NULL) {}
my_thread_id thread_id;
time_t start_time_in_secs;
uint command;
const char *user, *host, *db, *proc_info, *state_info;
CSET_STRING query_string;
};
// For sorting by thread_id.
class thread_info_compare {
public:
bool operator()(const thread_info *p1, const thread_info *p2) {
return p1->thread_id < p2->thread_id;
}
};
static const char *thread_state_info(THD *tmp) {
if (tmp->get_protocol()->get_rw_status()) {
if (tmp->get_protocol()->get_rw_status() == 2)
return "Sending to client";
else if (tmp->get_command() == COM_SLEEP)
return "";
else
return "Receiving from client";
} else {
MUTEX_LOCK(lock, &tmp->LOCK_current_cond);
if (tmp->proc_info)
return tmp->proc_info;
else if (tmp->current_cond.load())
return "Waiting on cond";
else
return NULL;
}
}
/**
This class implements callback function used by mysqld_list_processes() to
list all the client process information.
*/
typedef Mem_root_array<thread_info *> Thread_info_array;
class List_process_list : public Do_THD_Impl {
private:
/* Username of connected client. */
const char *m_user;
Thread_info_array *m_thread_infos;
/* THD of connected client. */
THD *m_client_thd;
size_t m_max_query_length;
public:
List_process_list(const char *user_value, Thread_info_array *thread_infos,
THD *thd_value, size_t max_query_length)
: m_user(user_value),
m_thread_infos(thread_infos),
m_client_thd(thd_value),
m_max_query_length(max_query_length) {}
virtual void operator()(THD *inspect_thd) {
Security_context *inspect_sctx = inspect_thd->security_context();
LEX_CSTRING inspect_sctx_user = inspect_sctx->user();
LEX_CSTRING inspect_sctx_host = inspect_sctx->host();
LEX_CSTRING inspect_sctx_host_or_ip = inspect_sctx->host_or_ip();
mysql_mutex_lock(&inspect_thd->LOCK_thd_protocol);
if ((!(inspect_thd->get_protocol() &&
inspect_thd->get_protocol()->connection_alive()) &&
!inspect_thd->system_thread) ||
(m_user && (inspect_thd->system_thread || !inspect_sctx_user.str ||
strcmp(inspect_sctx_user.str, m_user)))) {
mysql_mutex_unlock(&inspect_thd->LOCK_thd_protocol);
return;
}
mysql_mutex_unlock(&inspect_thd->LOCK_thd_protocol);
thread_info *thd_info = new (m_client_thd->mem_root) thread_info;
/* ID */
thd_info->thread_id = inspect_thd->thread_id();
/* USER */
if (inspect_sctx_user.str)
thd_info->user = m_client_thd->mem_strdup(inspect_sctx_user.str);
else if (inspect_thd->system_thread)
thd_info->user = "system user";
else
thd_info->user = "unauthenticated user";
/* HOST */
if (inspect_thd->peer_port &&
(inspect_sctx_host.length || inspect_sctx->ip().length) &&
m_client_thd->security_context()->host_or_ip().str[0]) {
char *host =
static_cast<char *>(m_client_thd->alloc(HOST_AND_PORT_LENGTH));
if (host)
snprintf(host, HOST_AND_PORT_LENGTH, "%s:%u",
inspect_sctx_host_or_ip.str, inspect_thd->peer_port);
thd_info->host = host;
} else
thd_info->host = m_client_thd->mem_strdup(
inspect_sctx_host_or_ip.str[0]
? inspect_sctx_host_or_ip.str
: inspect_sctx_host.length ? inspect_sctx_host.str : "");
DBUG_EXECUTE_IF("processlist_acquiring_dump_threads_LOCK_thd_data", {
if (inspect_thd->get_command() == COM_BINLOG_DUMP ||
inspect_thd->get_command() == COM_BINLOG_DUMP_GTID)
DEBUG_SYNC(m_client_thd,
"processlist_after_LOCK_thd_list_before_LOCK_thd_data");
});
/* DB */
mysql_mutex_lock(&inspect_thd->LOCK_thd_data);
const char *db = inspect_thd->db().str;
if (db) thd_info->db = m_client_thd->mem_strdup(db);
/* COMMAND */
if (inspect_thd->killed == THD::KILL_CONNECTION)
thd_info->proc_info = "Killed";
thd_info->command = (int)inspect_thd->get_command(); // Used for !killed.
/* STATE */
thd_info->state_info = thread_state_info(inspect_thd);
mysql_mutex_unlock(&inspect_thd->LOCK_thd_data);
/* INFO */
mysql_mutex_lock(&inspect_thd->LOCK_thd_query);
{
const char *query_str;
size_t query_length;
if ((query_length = inspect_thd->rewritten_query.length()) > 0) {
query_str = inspect_thd->rewritten_query.c_ptr();
} else {
query_length = inspect_thd->query().length;
query_str = inspect_thd->query().str;
}
String buf;
if (inspect_thd->is_a_srv_session()) {
buf.append(query_length ? "PLUGIN: " : "PLUGIN");
if (query_length) buf.append(query_str, query_length);
query_str = buf.c_ptr();
query_length = buf.length();
}
/* No else. We need fall-through */
if (query_str) {
const size_t width = min<size_t>(m_max_query_length, query_length);
const char *q = m_client_thd->strmake(query_str, width);
/* Safety: in case strmake failed, we set length to 0. */
thd_info->query_string =
CSET_STRING(q, q ? width : 0, inspect_thd->charset());
}
}
mysql_mutex_unlock(&inspect_thd->LOCK_thd_query);
/* MYSQL_TIME */
thd_info->start_time_in_secs = inspect_thd->query_start_in_secs();
m_thread_infos->push_back(thd_info);
}
};
void mysqld_list_processes(THD *thd, const char *user, bool verbose) {
Item *field;
List<Item> field_list;
Thread_info_array thread_infos(thd->mem_root);
size_t max_query_length =
(verbose ? thd->variables.max_allowed_packet : PROCESS_LIST_WIDTH);
Protocol *protocol = thd->get_protocol();
DBUG_TRACE;
field_list.push_back(
new Item_int(NAME_STRING("Id"), 0, MY_INT64_NUM_DECIMAL_DIGITS));
field_list.push_back(new Item_empty_string("User", USERNAME_CHAR_LENGTH));
field_list.push_back(new Item_empty_string("Host", HOSTNAME_LENGTH));
field_list.push_back(field = new Item_empty_string("db", NAME_CHAR_LEN));
field->maybe_null = 1;
field_list.push_back(new Item_empty_string("Command", 16));
field_list.push_back(field = new Item_return_int("Time", 7, MYSQL_TYPE_LONG));
field->unsigned_flag = 0;
field_list.push_back(field = new Item_empty_string("State", 30));
field->maybe_null = 1;
field_list.push_back(field = new Item_empty_string("Info", max_query_length));
field->maybe_null = 1;
if (thd->send_result_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
return;
if (!thd->killed) {
thread_infos.reserve(Global_THD_manager::get_instance()->get_thd_count());
List_process_list list_process_list(user, &thread_infos, thd,
max_query_length);
Global_THD_manager::get_instance()->do_for_all_thd_copy(&list_process_list);
}
// Return list sorted by thread_id.
std::sort(thread_infos.begin(), thread_infos.end(), thread_info_compare());
time_t now = my_time(0);
for (size_t ix = 0; ix < thread_infos.size(); ++ix) {
thread_info *thd_info = thread_infos.at(ix);
protocol->start_row();
protocol->store((ulonglong)thd_info->thread_id);
protocol->store(thd_info->user, system_charset_info);
protocol->store(thd_info->host, system_charset_info);
protocol->store(thd_info->db, system_charset_info);
if (thd_info->proc_info)
protocol->store(thd_info->proc_info, system_charset_info);
else
protocol->store(command_name[thd_info->command].str, system_charset_info);
if (thd_info->start_time_in_secs)
protocol->store_long((longlong)(now - thd_info->start_time_in_secs));
else
protocol->store_null();
protocol->store(thd_info->state_info, system_charset_info);
protocol->store(thd_info->query_string.str(),
thd_info->query_string.charset());
if (protocol->end_row()) break; /* purecov: inspected */
}
my_eof(thd);
}
/**
This class implements callback function used by fill_schema_processlist()
to populate all the client process information into I_S table.
*/
class Fill_process_list : public Do_THD_Impl {
private:
/* THD of connected client. */
THD *m_client_thd;
/* Information of each process is added as records into this table. */
TABLE_LIST *m_tables;
public:
Fill_process_list(THD *thd_value, TABLE_LIST *tables_value)
: m_client_thd(thd_value), m_tables(tables_value) {}
virtual void operator()(THD *inspect_thd) {
Security_context *inspect_sctx = inspect_thd->security_context();
LEX_CSTRING inspect_sctx_user = inspect_sctx->user();
LEX_CSTRING inspect_sctx_host = inspect_sctx->host();
LEX_CSTRING inspect_sctx_host_or_ip = inspect_sctx->host_or_ip();
const char *client_priv_user =
m_client_thd->security_context()->priv_user().str;
const char *user =
m_client_thd->security_context()->check_access(PROCESS_ACL)
? NullS
: client_priv_user;
if ((!inspect_thd->get_protocol()->connection_alive() &&
!inspect_thd->system_thread) ||
(user && (inspect_thd->system_thread || !inspect_sctx_user.str ||
strcmp(inspect_sctx_user.str, user))))
return;
TABLE *table = m_tables->table;
restore_record(table, s->default_values);
/* ID */
table->field[0]->store((ulonglong)inspect_thd->thread_id(), true);
/* USER */
const char *val = NULL;
if (inspect_sctx_user.str)
val = inspect_sctx_user.str;
else if (inspect_thd->system_thread)
val = "system user";
else
val = "unauthenticated user";
table->field[1]->store(val, strlen(val), system_charset_info);
/* HOST */
if (inspect_thd->peer_port &&
(inspect_sctx_host.length || inspect_sctx->ip().length) &&
m_client_thd->security_context()->host_or_ip().str[0]) {
char host[HOST_AND_PORT_LENGTH];
snprintf(host, HOST_AND_PORT_LENGTH, "%s:%u", inspect_sctx_host_or_ip.str,
inspect_thd->peer_port);
table->field[2]->store(host, strlen(host), system_charset_info);
} else
table->field[2]->store(inspect_sctx_host_or_ip.str,
inspect_sctx_host_or_ip.length,
system_charset_info);
DBUG_EXECUTE_IF("processlist_acquiring_dump_threads_LOCK_thd_data", {
if (inspect_thd->get_command() == COM_BINLOG_DUMP ||
inspect_thd->get_command() == COM_BINLOG_DUMP_GTID)
DEBUG_SYNC(m_client_thd,
"processlist_after_LOCK_thd_list_before_LOCK_thd_data");
});
/* DB */
mysql_mutex_lock(&inspect_thd->LOCK_thd_data);
const char *db = inspect_thd->db().str;
if (db) {
table->field[3]->store(db, strlen(db), system_charset_info);
table->field[3]->set_notnull();
}
/* COMMAND */
if (inspect_thd->killed == THD::KILL_CONNECTION) {
val = "Killed";
table->field[4]->store(val, strlen(val), system_charset_info);
} else
table->field[4]->store(command_name[inspect_thd->get_command()].str,
command_name[inspect_thd->get_command()].length,
system_charset_info);
/* STATE */
val = thread_state_info(inspect_thd);
if (val) {
table->field[6]->store(val, strlen(val), system_charset_info);
table->field[6]->set_notnull();
}
mysql_mutex_unlock(&inspect_thd->LOCK_thd_data);
/* INFO */
mysql_mutex_lock(&inspect_thd->LOCK_thd_query);
{
const char *query_str;
size_t query_length;
if (inspect_thd->rewritten_query.length()) {
query_str = inspect_thd->rewritten_query.c_ptr_safe();
query_length = inspect_thd->rewritten_query.length();
} else {
query_str = inspect_thd->query().str;
query_length = inspect_thd->query().length;
}
String buf;
if (inspect_thd->is_a_srv_session()) {
buf.append(query_length ? "PLUGIN: " : "PLUGIN");
if (query_length) buf.append(query_str, query_length);
query_str = buf.c_ptr();
query_length = buf.length();
}
/* No else. We need fall-through */
if (query_str) {
const size_t width = min<size_t>(PROCESS_LIST_INFO_WIDTH, query_length);
table->field[7]->store(query_str, width, inspect_thd->charset());
table->field[7]->set_notnull();
}
}
mysql_mutex_unlock(&inspect_thd->LOCK_thd_query);
/* MYSQL_TIME */
if (inspect_thd->query_start_in_secs())
table->field[5]->store((longlong)(my_micro_time() / 1000000 -
inspect_thd->query_start_in_secs()),
false);
else
table->field[5]->store(0, false);
schema_table_store_record(m_client_thd, table);
}
};
static int fill_schema_processlist(THD *thd, TABLE_LIST *tables, Item *) {
DBUG_TRACE;
Fill_process_list fill_process_list(thd, tables);
if (!thd->killed) {
Global_THD_manager::get_instance()->do_for_all_thd_copy(&fill_process_list);
}
return 0;
}
/*****************************************************************************
Status functions
*****************************************************************************/
// TODO: allocator based on my_malloc.
typedef std::vector<SHOW_VAR> Status_var_array;
Status_var_array all_status_vars(0);
bool status_vars_inited = 0;
/* Version counter, protected by LOCK_STATUS. */
ulonglong status_var_array_version = 0;
static inline int show_var_cmp(const SHOW_VAR *var1, const SHOW_VAR *var2) {
return strcmp(var1->name, var2->name);
}
class Show_var_cmp {
public:
bool operator()(const SHOW_VAR &var1, const SHOW_VAR &var2) {
return show_var_cmp(&var1, &var2) < 0;
}
};
static inline bool is_show_undef(const SHOW_VAR &var) {
return var.type == SHOW_UNDEF;
}
/*
Deletes all the SHOW_UNDEF elements from the array.
Shrinks array capacity to zero if it is completely empty.
*/
static void shrink_var_array(Status_var_array *array) {
/* remove_if maintains order for the elements that are *not* removed */
array->erase(std::remove_if(array->begin(), array->end(), is_show_undef),
array->end());
if (array->empty()) Status_var_array().swap(*array);
}
/*
Adds an array of SHOW_VAR entries to the output of SHOW STATUS
SYNOPSIS
add_status_vars(SHOW_VAR *list)
list - an array of SHOW_VAR entries to add to all_status_vars
the last entry must be {0,0,SHOW_UNDEF}
NOTE
The handling of all_status_vars[] is completely internal, it's allocated
automatically when something is added to it, and deleted completely when
the last entry is removed.
As a special optimization, if add_status_vars() is called before
init_status_vars(), it assumes "startup mode" - neither concurrent access
to the array nor SHOW STATUS are possible (thus it skips locks and sort)
The last entry of the all_status_vars[] should always be {0,0,SHOW_UNDEF}
*/
bool add_status_vars(const SHOW_VAR *list) {
MUTEX_LOCK(lock, status_vars_inited ? &LOCK_status : NULL);
try {
while (list->name) all_status_vars.push_back(*list++);
} catch (const std::bad_alloc &) {
my_error(ER_OUTOFMEMORY, MYF(ME_FATALERROR),
static_cast<int>(sizeof(Status_var_array::value_type)));
return true;
}
if (status_vars_inited)
std::sort(all_status_vars.begin(), all_status_vars.end(), Show_var_cmp());
status_var_array_version++;
return false;
}
/*
Make all_status_vars[] usable for SHOW STATUS
NOTE
See add_status_vars(). Before init_status_vars() call, add_status_vars()
works in a special fast "startup" mode. Thus init_status_vars()
should be called as late as possible but before enabling multi-threading.
*/
void init_status_vars() {
status_vars_inited = 1;
std::sort(all_status_vars.begin(), all_status_vars.end(), Show_var_cmp());
status_var_array_version++;
}
void reset_status_vars() {
Status_var_array::iterator ptr = all_status_vars.begin();
Status_var_array::iterator last = all_status_vars.end();
for (; ptr < last; ptr++) {
/* Note that SHOW_LONG_NOFLUSH variables are not reset */
if (ptr->type == SHOW_LONG || ptr->type == SHOW_SIGNED_LONG)
*(ulong *)ptr->value = 0;
}
}
/*
Current version of the all_status_vars.
*/
ulonglong get_status_vars_version(void) { return (status_var_array_version); }
/*
catch-all cleanup function, cleans up everything no matter what
DESCRIPTION
This function is not strictly required if all add_to_status/
remove_status_vars are properly paired, but it's a safety measure that
deletes everything from the all_status_vars[] even if some
remove_status_vars were forgotten
*/
void free_status_vars() {
Status_var_array().swap(all_status_vars);
status_var_array_version++;
}
/**
@brief Get the value of given status variable
@param[in] thd thread handler
@param[in] list list of SHOW_VAR objects in which function should
search
@param[in] name name of the status variable
@param[in] var_type Variable type
@param[in,out] value buffer in which value of the status variable
needs to be filled in
@param[in,out] length filled with buffer length
@return status
@retval false if variable is not found in the list
@retval true if variable is found in the list
*/
bool get_status_var(THD *thd, SHOW_VAR *list, const char *name,
char *const value, enum_var_type var_type, size_t *length) {
for (; list->name; list++) {
int res = strcmp(list->name, name);
if (res == 0) {
/*
if var->type is SHOW_FUNC, call the function.
Repeat as necessary, if new var is again SHOW_FUNC
*/
SHOW_VAR tmp;
for (; list->type == SHOW_FUNC; list = &tmp)
((mysql_show_var_func)(list->value))(thd, &tmp, value);
get_one_variable(thd, list, var_type, list->type, NULL, NULL, value,
length);
return true;
}
}
return false;
}
/*
Removes an array of SHOW_VAR entries from the output of SHOW STATUS
SYNOPSIS
remove_status_vars(SHOW_VAR *list)
list - an array of SHOW_VAR entries to remove to all_status_vars
the last entry must be {0,0,SHOW_UNDEF}
NOTE
there's lots of room for optimizing this, especially in non-sorted mode,
but nobody cares - it may be called only in case of failed plugin
initialization in the mysqld startup.
*/
void remove_status_vars(SHOW_VAR *list) {
if (status_vars_inited) {
mysql_mutex_lock(&LOCK_status);
size_t a = 0, b = all_status_vars.size(), c = (a + b) / 2;
for (; list->name; list++) {
int res = 0;
for (a = 0, b = all_status_vars.size(); b - a > 1; c = (a + b) / 2) {
res = show_var_cmp(list, &all_status_vars[c]);
if (res < 0)
b = c;
else if (res > 0)
a = c;
else
break;
}
if (res == 0) all_status_vars[c].type = SHOW_UNDEF;
}
shrink_var_array(&all_status_vars);
status_var_array_version++;
mysql_mutex_unlock(&LOCK_status);
} else {
uint i;
for (; list->name; list++) {
for (i = 0; i < all_status_vars.size(); i++) {
if (show_var_cmp(list, &all_status_vars[i])) continue;
all_status_vars[i].type = SHOW_UNDEF;
break;
}
}
shrink_var_array(&all_status_vars);
status_var_array_version++;
}
}
/**
Returns the value of a system or a status variable.
@param thd The handle of the current THD.
@param variable Details of the variable.
@param value_type Variable type.
@param show_type Variable show type.
@param status_var Status values or NULL if for system variable.
@param [out] charset Character set of the value.
@param [in,out] buff Buffer to store the value.
@param [out] length Length of the value.
@param [out] is_null Is variable value NULL or not.
@returns Pointer to the value buffer.
*/
const char *get_one_variable(THD *thd, const SHOW_VAR *variable,
enum_var_type value_type, SHOW_TYPE show_type,
System_status_var *status_var,
const CHARSET_INFO **charset, char *buff,
size_t *length, bool *is_null) {
return get_one_variable_ext(thd, thd, variable, value_type, show_type,
status_var, charset, buff, length, is_null);
}
/**
@brief Returns the value of a system or a status variable.
@param running_thd The handle of the current THD.
@param target_thd The handle of the remote THD.
@param variable Details of the variable.
@param value_type Variable type.
@param show_type Variable show type.
@param status_var Status values or NULL if for system variable.
@param [out] charset Character set of the value.
@param [in,out] buff Buffer to store the value.
@param [out] length Length of the value.
@param [out] is_null Is variable value NULL or not. This parameter is set
only for variables of string type.
@returns Pointer to the value buffer.
*/
const char *get_one_variable_ext(THD *running_thd, THD *target_thd,
const SHOW_VAR *variable,
enum_var_type value_type, SHOW_TYPE show_type,
System_status_var *status_var,
const CHARSET_INFO **charset, char *buff,
size_t *length, bool *is_null) {
const char *value;
const CHARSET_INFO *value_charset;
if (show_type == SHOW_SYS) {
LEX_STRING null_lex_str;
null_lex_str.str = 0; // For sys_var->value_ptr()
null_lex_str.length = 0;
sys_var *var = ((sys_var *)variable->value);
show_type = var->show_type();
value = pointer_cast<const char *>(
var->value_ptr(running_thd, target_thd, value_type, &null_lex_str));
value_charset = var->charset(target_thd);
} else {
value = variable->value;
value_charset = system_charset_info;
}
const char *pos = buff;
const char *end = buff;
/*
Note that value may == buff. All SHOW_xxx code below should still work.
*/
switch (show_type) {
case SHOW_DOUBLE_STATUS:
value = (char *)status_var + reinterpret_cast<size_t>(value);
/* 6 is the default precision for '%f' in sprintf() */
end = buff + my_fcvt(*pointer_cast<const double *>(value), 6, buff, NULL);
value_charset = system_charset_info;
break;
case SHOW_DOUBLE:
/* 6 is the default precision for '%f' in sprintf() */
end = buff + my_fcvt(*pointer_cast<const double *>(value), 6, buff, NULL);
value_charset = system_charset_info;
break;
case SHOW_LONG_STATUS:
value = (char *)status_var + reinterpret_cast<size_t>(value);
end = int10_to_str(*pointer_cast<const long *>(value), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_LONG:
/* the difference lies in refresh_status() */
case SHOW_LONG_NOFLUSH:
end = int10_to_str(*pointer_cast<const long *>(value), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_SIGNED_LONG:
end = int10_to_str(*pointer_cast<const long *>(value), buff, -10);
value_charset = system_charset_info;
break;
case SHOW_LONGLONG_STATUS:
value = (char *)status_var + reinterpret_cast<size_t>(value);
end = longlong10_to_str(*pointer_cast<const longlong *>(value), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_LONGLONG:
end = longlong10_to_str(*pointer_cast<const longlong *>(value), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_SIGNED_LONGLONG:
end =
longlong10_to_str(*pointer_cast<const longlong *>(value), buff, -10);
value_charset = system_charset_info;
break;
case SHOW_HA_ROWS:
end = longlong10_to_str(
static_cast<longlong>(*pointer_cast<const ha_rows *>(value)), buff,
10);
value_charset = system_charset_info;
break;
case SHOW_BOOL:
end = my_stpcpy(buff, *pointer_cast<const bool *>(value) ? "ON" : "OFF");
value_charset = system_charset_info;
break;
case SHOW_MY_BOOL:
end = my_stpcpy(buff, *pointer_cast<const bool *>(value) ? "ON" : "OFF");
value_charset = system_charset_info;
break;
case SHOW_INT:
end = int10_to_str(
static_cast<long>(*pointer_cast<const uint32 *>(value)), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_SIGNED_INT:
end = int10_to_str(static_cast<long>(*pointer_cast<const int32 *>(value)),
buff, -10);
value_charset = system_charset_info;
break;
case SHOW_HAVE: {
SHOW_COMP_OPTION tmp = *pointer_cast<const SHOW_COMP_OPTION *>(value);
pos = show_comp_option_name[(int)tmp];
end = strend(pos);
value_charset = system_charset_info;
break;
}
case SHOW_CHAR: {
if (!(pos = value)) pos = "";
end = strend(pos);
break;
}
case SHOW_CHAR_PTR: {
if (!(pos = *pointer_cast<char *const *>(value))) {
pos = "";
if (is_null) *is_null = true;
} else {
if (is_null) *is_null = false;
}
end = strend(pos);
break;
}
case SHOW_LEX_STRING: {
const LEX_STRING *ls = pointer_cast<const LEX_STRING *>(value);
if (!(pos = ls->str))
end = pos = "";
else
end = pos + ls->length;
break;
}
case SHOW_KEY_CACHE_LONG:
value = (char *)dflt_key_cache + reinterpret_cast<size_t>(value);
end = int10_to_str(*pointer_cast<const long *>(value), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_KEY_CACHE_LONGLONG:
value = (char *)dflt_key_cache + reinterpret_cast<size_t>(value);
end = longlong10_to_str(*pointer_cast<const longlong *>(value), buff, 10);
value_charset = system_charset_info;
break;
case SHOW_UNDEF:
break; /* Return empty string */
case SHOW_SYS: /* Cannot happen */
default:
DBUG_ASSERT(0);
break;
}
*length = (size_t)(end - pos);
/* Some callers do not use the result. */
if (charset != NULL) {
DBUG_ASSERT(value_charset != NULL);
*charset = value_charset;
}
return pos;
}
/**
Collect status for all running threads.
*/
class Add_status : public Do_THD_Impl {
public:
Add_status(System_status_var *value) : m_stat_var(value) {}
virtual void operator()(THD *thd) {
if (!thd->status_var_aggregated)
add_to_status(m_stat_var, &thd->status_var);
}
private:
/* Status of all threads are summed into this. */
System_status_var *m_stat_var;
};
void calc_sum_of_all_status(System_status_var *to) {
DBUG_TRACE;
mysql_mutex_assert_owner(&LOCK_status);
/* Get global values as base. */
*to = global_status_var;
Add_status add_status(to);
Global_THD_manager::get_instance()->do_for_all_thd_copy(&add_status);
}
/* This is only used internally, but we need it here as a forward reference */
extern ST_SCHEMA_TABLE schema_tables[];
/*
Store record to I_S table, convert HEAP table
to MyISAM if necessary
SYNOPSIS
schema_table_store_record()
thd thread handler
table Information schema table to be updated
RETURN
0 success
1 error
*/
bool schema_table_store_record(THD *thd, TABLE *table) {
int error;
if ((error = table->file->ha_write_row(table->record[0]))) {
if (create_ondisk_from_heap(thd, table, error, false, NULL)) return true;
}
return false;
}
/**
Store record to I_S table, convert HEAP table to InnoDB table if necessary.
@param[in] thd thread handler
@param[in] table Information schema table to be updated
@param[in] make_ondisk if true, convert heap table to on disk table.
default value is true.
@return 0 on success
@return error code on failure.
*/
int schema_table_store_record2(THD *thd, TABLE *table, bool make_ondisk) {
int error;
if ((error = table->file->ha_write_row(table->record[0]))) {
if (!make_ondisk) return error;
if (convert_heap_table_to_ondisk(thd, table, error)) return 1;
}
return 0;
}
/**
Convert HEAP table to InnoDB table if necessary
@param[in] thd thread handler
@param[in] table Information schema table to be converted.
@param[in] error the error code returned previously.
@return false on success, true on error.
*/
bool convert_heap_table_to_ondisk(THD *thd, TABLE *table, int error) {
return (create_ondisk_from_heap(thd, table, error, false, NULL));
}
/**
Prepare a Table_ident and add a table_list into SELECT_LEX
@param thd Thread
@param sel Instance of SELECT_LEX.
@param db_name Database name.
@param table_name Table name.
@returns true on failure.
false on success.
*/
bool make_table_list(THD *thd, SELECT_LEX *sel, const LEX_CSTRING &db_name,
const LEX_CSTRING &table_name) {
Table_ident *table_ident = new (thd->mem_root)
Table_ident(thd->get_protocol(), db_name, table_name, 1);
if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, MDL_SHARED_READ))
return true;
return false;
}
enum enum_schema_tables get_schema_table_idx(ST_SCHEMA_TABLE *schema_table) {
return (enum enum_schema_tables)(schema_table - &schema_tables[0]);
}
/**
* Implementation of SHOW INDEX / SHOW COLUMNS for temporary tables.
*
* @param thd Thread handle
* @param tables Table to fill with data
* @return
*/
static int show_temporary_tables(THD *thd, TABLE_LIST *tables, Item *) {
TABLE *table = tables->table;
SELECT_LEX *lsel = tables->schema_select_lex;
ST_SCHEMA_TABLE *schema_table = tables->schema_table;
DBUG_TRACE;
/*
This code is now only used for SHOW statements for temporary tables
and not for any I_S queries.
*/
DBUG_ASSERT(thd->lex->sql_command == SQLCOM_SHOW_KEYS ||
thd->lex->sql_command == SQLCOM_SHOW_FIELDS);
DBUG_ASSERT(lsel && lsel->table_list.first);
/*
When a view is opened its structures are allocated on a permanent
statement arena and linked into the LEX tree for the current statement
(this happens even in cases when view is handled through TEMPTABLE
algorithm).
To prevent this process from unnecessary hogging of memory in the permanent
arena of our I_S query and to avoid damaging its LEX we use temporary
arena and LEX for table/view opening.
Use temporary arena instead of statement permanent arena. Also make
it active arena and save original one for successive restoring.
*/
Query_arena i_s_arena(thd->mem_root, Query_arena::STMT_REGULAR_EXECUTION);
Query_arena *old_arena = thd->stmt_arena;
thd->stmt_arena = &i_s_arena;
Query_arena backup_arena;
thd->swap_query_arena(i_s_arena, &backup_arena);
/* Prepare temporary LEX. */
LEX temp_lex;
LEX *lex = &temp_lex;
LEX *old_lex = thd->lex;
thd->lex = lex;
lex_start(thd);
/* Disable constant subquery evaluation as we won't be locking tables. */
lex->context_analysis_only = CONTEXT_ANALYSIS_ONLY_VIEW;
/*
Some of process_table() functions rely on wildcard being passed from
old LEX (or at least being initialized).
*/
lex->wild = old_lex->wild;
TABLE_LIST *table_list;
bool result = true;
/*
Since make_table_list() might change database and table name passed
to it we create copies of the db and table name.
These copies are used for make_table_list() while unaltered values
are passed to process_table() functions.
*/
LEX_CSTRING db_name_lex_cstr, table_name_lex_cstr;
if (lex_string_strmake(thd->mem_root, &db_name_lex_cstr,
lsel->table_list.first->db,
lsel->table_list.first->db_length) ||
lex_string_strmake(thd->mem_root, &table_name_lex_cstr,
lsel->table_list.first->table_name,
lsel->table_list.first->table_name_length))
goto end;
/*
Create table list element for table to be open. Link it with the
temporary LEX. The latter is required to correctly open views and
produce table describing their structure.
*/
if (make_table_list(thd, lex->select_lex, db_name_lex_cstr,
table_name_lex_cstr))
goto end;
table_list = lex->select_lex->table_list.first;
DBUG_ASSERT(!table_list->is_view_or_derived());
result = open_temporary_tables(thd, table_list);
if (!result)
result = open_tables_for_query(
thd, table_list,
MYSQL_OPEN_IGNORE_FLUSH | MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL);
/*
Restore old value of sql_command back as it is being looked at in
process_table() function.
*/
lex->sql_command = old_lex->sql_command;
if (!result) {
const LEX_CSTRING orig_db_name{lsel->table_list.first->db,
lsel->table_list.first->db_length};
const LEX_CSTRING orig_table_name{
lsel->table_list.first->table_name,
lsel->table_list.first->table_name_length};
result = schema_table->process_table(thd, table_list, table, result,
orig_db_name, orig_table_name);
}
end:
lex->unit->cleanup(thd, true);
/* Restore original LEX value, statement's arena and THD arena values. */
lex_end(thd->lex);
// Free items, before restoring backup_arena below.
DBUG_ASSERT(i_s_arena.item_list() == nullptr);
thd->free_items();
thd->lex = old_lex;
thd->stmt_arena = old_arena;
thd->swap_query_arena(backup_arena, &i_s_arena);
return result;
}
/* Define fields' indexes for COLUMNS of temporary tables */
#define TMP_TABLE_COLUMNS_COLUMN_NAME 0
#define TMP_TABLE_COLUMNS_COLUMN_TYPE 1
#define TMP_TABLE_COLUMNS_COLLATION_NAME 2
#define TMP_TABLE_COLUMNS_IS_NULLABLE 3
#define TMP_TABLE_COLUMNS_COLUMN_KEY 4
#define TMP_TABLE_COLUMNS_COLUMN_DEFAULT 5
#define TMP_TABLE_COLUMNS_EXTRA 6
#define TMP_TABLE_COLUMNS_PRIVILEGES 7
#define TMP_TABLE_COLUMNS_COLUMN_COMMENT 8
#define TMP_TABLE_COLUMNS_GENERATION_EXPRESSION 9
static int get_schema_tmp_table_columns_record(THD *thd, TABLE_LIST *tables,
TABLE *table, bool res,
LEX_CSTRING db_name,
LEX_CSTRING table_name) {
DBUG_TRACE;
DBUG_ASSERT(thd->lex->sql_command == SQLCOM_SHOW_FIELDS);
if (res) return res;
const char *wild = thd->lex->wild ? thd->lex->wild->ptr() : nullptr;
CHARSET_INFO *cs = system_charset_info;
TABLE *show_table = tables->table;
Field **ptr = show_table->field;
Field *field;
show_table->use_all_columns(); // Required for default
restore_record(show_table, s->default_values);
for (; (field = *ptr); ptr++) {
const uchar *pos;
char tmp[MAX_FIELD_WIDTH];
String type(tmp, sizeof(tmp), system_charset_info);
if (wild && wild[0] &&
wild_case_compare(system_charset_info, field->field_name, wild))
continue;
// Get default row, with all NULL fields set to NULL
restore_record(table, s->default_values);
// NAME
table->field[TMP_TABLE_COLUMNS_COLUMN_NAME]->store(
field->field_name, strlen(field->field_name), cs);
// COLUMN_TYPE
field->sql_type(type);
table->field[TMP_TABLE_COLUMNS_COLUMN_TYPE]->store(type.ptr(),
type.length(), cs);
// COLLATION_NAME
if (field->has_charset()) {
table->field[TMP_TABLE_COLUMNS_COLLATION_NAME]->store(
field->charset()->name, strlen(field->charset()->name), cs);
table->field[TMP_TABLE_COLUMNS_COLLATION_NAME]->set_notnull();
}
// IS_NULLABLE
pos = pointer_cast<const uchar *>((field->flags & NOT_NULL_FLAG) ? "NO"
: "YES");
table->field[TMP_TABLE_COLUMNS_IS_NULLABLE]->store(
(const char *)pos, strlen((const char *)pos), cs);
// COLUMN_KEY
pos = pointer_cast<const uchar *>(
(field->flags & PRI_KEY_FLAG)
? "PRI"
: (field->flags & UNIQUE_KEY_FLAG)
? "UNI"
: (field->flags & MULTIPLE_KEY_FLAG) ? "MUL" : "");
table->field[TMP_TABLE_COLUMNS_COLUMN_KEY]->store(
(const char *)pos, strlen((const char *)pos), cs);
// COLUMN_DEFAULT
if (print_default_clause(thd, field, &type, false)) {
table->field[TMP_TABLE_COLUMNS_COLUMN_DEFAULT]->store(type.ptr(),
type.length(), cs);
table->field[TMP_TABLE_COLUMNS_COLUMN_DEFAULT]->set_notnull();
}
// EXTRA
/*
For non-temporary tables, EXTRA column value in I_S.columns table
is stored as below,
IF (col.is_auto_increment=true,
CONCAT(IFNULL(CONCAT("on update ", col.update_option, " "),''),
"auto_increment"),
CONCAT("on update ", col.update_option)) AS EXTRA,
Following the same logic for columns of temporary tables also.
*/
if (field->auto_flags & Field::NEXT_NUMBER) {
if (print_on_update_clause(field, &type, true))
table->field[TMP_TABLE_COLUMNS_EXTRA]->store(type.ptr(), type.length(),
cs);
table->field[TMP_TABLE_COLUMNS_EXTRA]->store(
STRING_WITH_LEN("auto_increment"), cs);
} else {
if (print_on_update_clause(field, &type, true))
table->field[TMP_TABLE_COLUMNS_EXTRA]->store(type.ptr(), type.length(),
cs);
else
table->field[TMP_TABLE_COLUMNS_EXTRA]->store(STRING_WITH_LEN("NULL"),
cs);
}
// PRIVILEGES
uint col_access;
check_access(thd, SELECT_ACL, db_name.str, &tables->grant.privilege,
nullptr, false, tables->schema_table != nullptr);
col_access = get_column_grant(thd, &tables->grant, db_name.str,
table_name.str, field->field_name) &
COL_ACLS;
if (!tables->schema_table && !col_access) continue;
char *end = tmp;
for (uint bitnr = 0; col_access; col_access >>= 1, bitnr++) {
if (col_access & 1) {
*end++ = ',';
end = my_stpcpy(end, grant_types.type_names[bitnr]);
}
}
table->field[TMP_TABLE_COLUMNS_PRIVILEGES]->store(
tmp + 1, end == tmp ? 0 : (uint)(end - tmp - 1), cs);
// COLUMN_COMMENT
table->field[TMP_TABLE_COLUMNS_COLUMN_COMMENT]->store(
field->comment.str, field->comment.length, cs);
// COLUMN_GENERATION_EXPRESSION
if (field->gcol_info) {
if (field->stored_in_db)
table->field[TMP_TABLE_COLUMNS_EXTRA]->store(
STRING_WITH_LEN("STORED GENERATED"), cs);
else
table->field[TMP_TABLE_COLUMNS_EXTRA]->store(
STRING_WITH_LEN("VIRTUAL GENERATED"), cs);
char buffer[128];
String s(buffer, sizeof(buffer), system_charset_info);
field->gcol_info->print_expr(thd, &s);
table->field[TMP_TABLE_COLUMNS_GENERATION_EXPRESSION]->store(
s.ptr(), s.length(), cs);
} else
table->field[TMP_TABLE_COLUMNS_GENERATION_EXPRESSION]->set_null();
if (schema_table_store_record(thd, table)) return 1;
}
return 0;
}
static bool iter_schema_engines(THD *thd, plugin_ref plugin, void *ptable) {
TABLE *table = (TABLE *)ptable;
handlerton *hton = plugin_data<handlerton *>(plugin);
const char *wild = thd->lex->wild ? thd->lex->wild->ptr() : NullS;
CHARSET_INFO *scs = system_charset_info;
handlerton *default_type = ha_default_handlerton(thd);
DBUG_TRACE;
/* Disabled plugins */
if (plugin_state(plugin) != PLUGIN_IS_READY) {
struct st_mysql_plugin *plug = plugin_decl(plugin);
if (!(wild && wild[0] && wild_case_compare(scs, plug->name, wild))) {
restore_record(table, s->default_values);
table->field[0]->store(plug->name, strlen(plug->name), scs);
table->field[1]->store(STRING_WITH_LEN("NO"), scs);
table->field[2]->store(plug->descr, strlen(plug->descr), scs);
if (schema_table_store_record(thd, table)) return 1;
}
return 0;
}
if (!(hton->flags & HTON_HIDDEN)) {
LEX_CSTRING *name = plugin_name(plugin);
if (!(wild && wild[0] && wild_case_compare(scs, name->str, wild))) {
LEX_CSTRING yesno[2] = {{STRING_WITH_LEN("NO")},
{STRING_WITH_LEN("YES")}};
LEX_CSTRING *tmp;
const char *option_name = show_comp_option_name[(int)hton->state];
restore_record(table, s->default_values);
table->field[0]->store(name->str, name->length, scs);
if (hton->state == SHOW_OPTION_YES && default_type == hton)
option_name = "DEFAULT";
table->field[1]->store(option_name, strlen(option_name), scs);
table->field[2]->store(plugin_decl(plugin)->descr,
strlen(plugin_decl(plugin)->descr), scs);
tmp = &yesno[MY_TEST(hton->commit)];
table->field[3]->store(tmp->str, tmp->length, scs);
table->field[3]->set_notnull();
tmp = &yesno[MY_TEST(hton->prepare)];
table->field[4]->store(tmp->str, tmp->length, scs);
table->field[4]->set_notnull();
tmp = &yesno[MY_TEST(hton->savepoint_set)];
table->field[5]->store(tmp->str, tmp->length, scs);
table->field[5]->set_notnull();
if (schema_table_store_record(thd, table)) return 1;
}
}
return 0;
}
static int fill_schema_engines(THD *thd, TABLE_LIST *tables, Item *) {
DBUG_TRACE;
if (plugin_foreach_with_mask(thd, iter_schema_engines,
MYSQL_STORAGE_ENGINE_PLUGIN, ~PLUGIN_IS_FREED,
tables->table))
return 1;
return 0;
}
/* Define fields' indexes for KEYS of temporary tables */
#define TMP_TABLE_KEYS_TABLE_NAME 0
#define TMP_TABLE_KEYS_IS_NON_UNIQUE 1
#define TMP_TABLE_KEYS_INDEX_SCHEMA 2
#define TMP_TABLE_KEYS_INDEX_NAME 3
#define TMP_TABLE_KEYS_SEQ_IN_INDEX 4
#define TMP_TABLE_KEYS_COLUMN_NAME 5
#define TMP_TABLE_KEYS_COLLATION 6
#define TMP_TABLE_KEYS_CARDINALITY 7
#define TMP_TABLE_KEYS_SUB_PART 8
#define TMP_TABLE_KEYS_PACKED 9
#define TMP_TABLE_KEYS_IS_NULLABLE 10
#define TMP_TABLE_KEYS_INDEX_TYPE 11
#define TMP_TABLE_KEYS_COMMENT 12
#define TMP_TABLE_KEYS_INDEX_COMMENT 13
#define TMP_TABLE_KEYS_IS_VISIBLE 14
#define TMP_TABLE_KEYS_EXPRESSION 15
static int get_schema_tmp_table_keys_record(THD *thd, TABLE_LIST *tables,
TABLE *table, bool res, LEX_CSTRING,
LEX_CSTRING table_name) {
DBUG_TRACE;
DBUG_ASSERT(thd->lex->sql_command == SQLCOM_SHOW_KEYS);
if (res) return res;
CHARSET_INFO *cs = system_charset_info;
TABLE *show_table = tables->table;
KEY *key_info = show_table->s->key_info;
if (show_table->file)
show_table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK |
HA_STATUS_TIME);
for (uint i = 0; i < show_table->s->keys; i++, key_info++) {
KEY_PART_INFO *key_part = key_info->key_part;
const char *str;
for (uint j = 0; j < key_info->user_defined_key_parts; j++, key_part++) {
restore_record(table, s->default_values);
// TABLE_NAME
table->field[TMP_TABLE_KEYS_TABLE_NAME]->store(table_name.str,
table_name.length, cs);
// NON_UNIQUE
table->field[TMP_TABLE_KEYS_IS_NON_UNIQUE]->store(
(longlong)((key_info->flags & HA_NOSAME) ? 0 : 1), true);
// INDEX_NAME
table->field[TMP_TABLE_KEYS_INDEX_NAME]->store(
key_info->name, strlen(key_info->name), cs);
// SEQ_IN_INDEX
table->field[TMP_TABLE_KEYS_SEQ_IN_INDEX]->store((longlong)(j + 1), true);
// COLUMN_NAME
str = (key_part->field ? key_part->field->field_name : "?unknown field?");
if (key_part->field && key_part->field->is_hidden_from_user()) {
table->field[TMP_TABLE_KEYS_COLUMN_NAME]->set_null();
} else {
table->field[TMP_TABLE_KEYS_COLUMN_NAME]->store(str, strlen(str), cs);
table->field[TMP_TABLE_KEYS_COLUMN_NAME]->set_notnull();
}
if (show_table->file) {
// COLLATION
if (show_table->file->index_flags(i, j, 0) & HA_READ_ORDER) {
table->field[TMP_TABLE_KEYS_COLLATION]->store(
((key_part->key_part_flag & HA_REVERSE_SORT) ? "D" : "A"), 1, cs);
table->field[TMP_TABLE_KEYS_COLLATION]->set_notnull();
}
// CARDINALITY
KEY *key = show_table->key_info + i;
if (key->has_records_per_key(j)) {
double records =
(show_table->file->stats.records / key->records_per_key(j));
table->field[TMP_TABLE_KEYS_CARDINALITY]->store(
static_cast<longlong>(round(records)), true);
table->field[TMP_TABLE_KEYS_CARDINALITY]->set_notnull();
}
}
// INDEX_TYPE
if (key_info->flags & HA_SPATIAL)
str = "SPATIAL";
else {
ha_key_alg key_alg = key_info->algorithm;
/* If index algorithm is implicit get SE default. */
switch (key_alg) {
case HA_KEY_ALG_SE_SPECIFIC:
str = "";
break;
case HA_KEY_ALG_BTREE:
str = "BTREE";
break;
case HA_KEY_ALG_RTREE:
str = "RTREE";
break;
case HA_KEY_ALG_HASH:
str = "HASH";
break;
case HA_KEY_ALG_FULLTEXT:
str = "FULLTEXT";
break;
default:
DBUG_ASSERT(0);
str = "";
}
}
table->field[TMP_TABLE_KEYS_INDEX_TYPE]->store(str, strlen(str), cs);
// SUB_PART
if (!(key_info->flags & HA_FULLTEXT) &&
(key_part->field &&
key_part->length !=
show_table->s->field[key_part->fieldnr - 1]->key_length())) {
table->field[TMP_TABLE_KEYS_SUB_PART]->store(
key_part->length / key_part->field->charset()->mbmaxlen, true);
table->field[TMP_TABLE_KEYS_SUB_PART]->set_notnull();
}
// NULLABLE
uint flags = key_part->field ? key_part->field->flags : 0;
const char *pos = ((flags & NOT_NULL_FLAG) ? "" : "YES");
table->field[TMP_TABLE_KEYS_IS_NULLABLE]->store(pos, strlen(pos), cs);
// COMMENT
if (!show_table->s->keys_in_use.is_set(i) && key_info->is_visible)
table->field[TMP_TABLE_KEYS_COMMENT]->store(STRING_WITH_LEN("disabled"),
cs);
else
table->field[TMP_TABLE_KEYS_COMMENT]->store("", 0, cs);
table->field[TMP_TABLE_KEYS_COMMENT]->set_notnull();
// INDEX_COMMENT
DBUG_ASSERT(MY_TEST(key_info->flags & HA_USES_COMMENT) ==
(key_info->comment.length > 0));
if (key_info->flags & HA_USES_COMMENT)
table->field[TMP_TABLE_KEYS_INDEX_COMMENT]->store(
key_info->comment.str, key_info->comment.length, cs);
// is_visible column
const char *is_visible = key_info->is_visible ? "YES" : "NO";
table->field[TMP_TABLE_KEYS_IS_VISIBLE]->store(is_visible,
strlen(is_visible), cs);
table->field[TMP_TABLE_KEYS_IS_VISIBLE]->set_notnull();
// Expression for functional key parts
if (key_info->key_part->field->is_hidden_from_user()) {
Value_generator *gcol = key_info->key_part->field->gcol_info;
table->field[TMP_TABLE_KEYS_EXPRESSION]->store(
gcol->expr_str.str, gcol->expr_str.length, cs);
table->field[TMP_TABLE_KEYS_EXPRESSION]->set_notnull();
} else {
table->field[TMP_TABLE_KEYS_EXPRESSION]->set_null();
}
if (schema_table_store_record(thd, table)) return 1;
}
}
return res;
}
/*
Convert a string in a given character set to a string which can be
used for FRM file storage in which case use_hex is true and we store
the character constants as hex strings in the character set encoding
their field have. In the case of SHOW CREATE TABLE and the
PARTITIONS information schema table we instead provide utf8 strings
to the user and convert to the utf8 character set.
SYNOPSIS
get_cs_converted_part_value_from_string()
item Item from which constant comes
input_str String as provided by val_str after
conversion to character set
output_str Out value: The string created
cs Character set string is encoded in
NULL for INT_RESULT's here
use_hex true => hex string created
false => utf8 constant string created
RETURN VALUES
true Error
false Ok
*/
bool get_cs_converted_part_value_from_string(THD *thd, Item *item,
String *input_str,
String *output_str,
const CHARSET_INFO *cs,
bool use_hex) {
if (item->result_type() == INT_RESULT) {
longlong value = item->val_int();
output_str->set(value, system_charset_info);
return false;
}
if (!input_str) {
my_error(ER_PARTITION_FUNCTION_IS_NOT_ALLOWED, MYF(0));
return true;
}
get_cs_converted_string_value(thd, input_str, output_str, cs, use_hex);
return false;
}
static int fill_open_tables(THD *thd, TABLE_LIST *tables, Item *) {
DBUG_TRACE;
const char *wild = thd->lex->wild ? thd->lex->wild->ptr() : NullS;
TABLE *table = tables->table;
CHARSET_INFO *cs = system_charset_info;
OPEN_TABLE_LIST *open_list;
if (!(open_list = list_open_tables(thd, thd->lex->select_lex->db, wild)) &&
thd->is_fatal_error())
return 1;
for (; open_list; open_list = open_list->next) {
restore_record(table, s->default_values);
table->field[0]->store(open_list->db, strlen(open_list->db), cs);
table->field[1]->store(open_list->table, strlen(open_list->table), cs);
table->field[2]->store((longlong)open_list->in_use, true);
table->field[3]->store((longlong)open_list->locked, true);
if (schema_table_store_record(thd, table)) return 1;
}
return 0;
}
struct schema_table_ref {
const char *table_name;
ST_SCHEMA_TABLE *schema_table;
};
/*
Find schema_tables elment by name
SYNOPSIS
find_schema_table_in_plugin()
plugin plugin
table_name table name
RETURN
0 table not found
1 found the schema table
*/
static bool find_schema_table_in_plugin(THD *, plugin_ref plugin,
void *p_table) {
schema_table_ref *p_schema_table = (schema_table_ref *)p_table;
const char *table_name = p_schema_table->table_name;
ST_SCHEMA_TABLE *schema_table = plugin_data<ST_SCHEMA_TABLE *>(plugin);
DBUG_TRACE;
if (!my_strcasecmp(system_charset_info, schema_table->table_name,
table_name)) {
p_schema_table->schema_table = schema_table;
return true;
}
return false;
}
/*
Find schema_tables elment by name
SYNOPSIS
find_schema_table()
thd thread handler
table_name table name
RETURN
0 table not found
# pointer to 'schema_tables' element
*/
ST_SCHEMA_TABLE *find_schema_table(THD *thd, const char *table_name) {
schema_table_ref schema_table_a;
ST_SCHEMA_TABLE *schema_table = schema_tables;
DBUG_TRACE;
for (; schema_table->table_name; schema_table++) {
if (!my_strcasecmp(system_charset_info, schema_table->table_name,
table_name))
return schema_table;
}
schema_table_a.table_name = table_name;
if (plugin_foreach(thd, find_schema_table_in_plugin,
MYSQL_INFORMATION_SCHEMA_PLUGIN, &schema_table_a))
return schema_table_a.schema_table;
return NULL;
}
ST_SCHEMA_TABLE *get_schema_table(enum enum_schema_tables schema_table_idx) {
return &schema_tables[schema_table_idx];
}
/**
Create information_schema table using schema_table data.
@note
For MYSQL_TYPE_DECIMAL fields only, the field_length member has encoded
into it two numbers, based on modulus of base-10 numbers. In the ones
position is the number of decimals. Tens position is unused. In the
hundreds and thousands position is a two-digit decimal number representing
length. Encode this value with (decimals*100)+length , where
0<decimals<10 and 0<=length<100 .
@param thd thread handler
@param table_list Used to pass I_S table information(fields info, tables
parameters etc) and table name.
@returns Pointer to created table
@retval NULL Can't create table
*/
static TABLE *create_schema_table(THD *thd, TABLE_LIST *table_list) {
int field_count = 0;
Item *item;
TABLE *table;
List<Item> field_list;
ST_SCHEMA_TABLE *schema_table = table_list->schema_table;
ST_FIELD_INFO *fields_info = schema_table->fields_info;
CHARSET_INFO *cs = system_charset_info;
DBUG_TRACE;
for (; fields_info->field_name; fields_info++) {
switch (fields_info->field_type) {
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONGLONG:
case MYSQL_TYPE_INT24:
if (!(item = new Item_return_int(
fields_info->field_name, fields_info->field_length,
fields_info->field_type, fields_info->value))) {
return 0;
}
item->unsigned_flag = (fields_info->field_flags & MY_I_S_UNSIGNED);
break;
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_DATETIME: {
const Name_string field_name(fields_info->field_name,
strlen(fields_info->field_name));
if (!(item =
new Item_temporal(fields_info->field_type, field_name, 0, 0)))
return 0;
if (fields_info->field_type == MYSQL_TYPE_TIMESTAMP ||
fields_info->field_type == MYSQL_TYPE_DATETIME)
item->decimals = fields_info->field_length;
break;
}
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE: {
const Name_string field_name(fields_info->field_name,
strlen(fields_info->field_name));
if ((item = new Item_float(field_name, 0.0, DECIMAL_NOT_SPECIFIED,
fields_info->field_length)) == NULL)
return NULL;
break;
}
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_NEWDECIMAL:
if (!(item = new Item_decimal((longlong)fields_info->value, false))) {
return 0;
}
item->unsigned_flag = (fields_info->field_flags & MY_I_S_UNSIGNED);
item->decimals = fields_info->field_length % 10;
item->max_length = (fields_info->field_length / 100) % 100;
if (item->unsigned_flag == 0) item->max_length += 1;
if (item->decimals > 0) item->max_length += 1;
item->item_name.copy(fields_info->field_name);
break;
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
if (!(item = new Item_blob(fields_info->field_name,
fields_info->field_length))) {
return 0;
}
break;
default:
/* Don't let unimplemented types pass through. Could be a grave error.
*/
DBUG_ASSERT(fields_info->field_type == MYSQL_TYPE_STRING);
if (!(item =
new Item_empty_string("", fields_info->field_length, cs))) {
return 0;
}
item->item_name.copy(fields_info->field_name);
break;
}
field_list.push_back(item);
item->maybe_null = (fields_info->field_flags & MY_I_S_MAYBE_NULL);
field_count++;
}
Temp_table_param *tmp_table_param = new (thd->mem_root) Temp_table_param;
if (!tmp_table_param) return 0;
tmp_table_param->table_charset = cs;
tmp_table_param->field_count = field_count;
tmp_table_param->schema_table = 1;
SELECT_LEX *select_lex = thd->lex->current_select();
if (!(table = create_tmp_table(
thd, tmp_table_param, field_list, (ORDER *)0, 0, 0,
select_lex->active_options() | TMP_TABLE_ALL_COLUMNS, HA_POS_ERROR,
table_list->alias)))
return 0;
my_bitmap_map *bitmaps =
(my_bitmap_map *)thd->alloc(bitmap_buffer_size(field_count));
bitmap_init(&table->def_read_set, bitmaps, field_count, false);
table->read_set = &table->def_read_set;
bitmap_clear_all(table->read_set);
table_list->schema_table_param = tmp_table_param;
return table;
}
/*
For old SHOW compatibility. It is used when
old SHOW doesn't have generated column names
Make list of fields for SHOW
SYNOPSIS
make_old_format()
thd thread handler
schema_table pointer to 'schema_tables' element
RETURN
1 error
0 success
*/
static int make_old_format(THD *thd, ST_SCHEMA_TABLE *schema_table) {
ST_FIELD_INFO *field_info = schema_table->fields_info;
Name_resolution_context *context = &thd->lex->select_lex->context;
for (; field_info->field_name; field_info++) {
if (field_info->old_name) {
Item_field *field =
new Item_field(context, NullS, NullS, field_info->field_name);
if (field) {
field->item_name.copy(field_info->old_name);
if (add_item_to_list(thd, field)) return 1;
}
}
}
return 0;
}
static int make_tmp_table_columns_format(THD *thd,
ST_SCHEMA_TABLE *schema_table) {
int fields_arr[] = {
TMP_TABLE_COLUMNS_COLUMN_NAME, TMP_TABLE_COLUMNS_COLUMN_TYPE,
TMP_TABLE_COLUMNS_COLLATION_NAME, TMP_TABLE_COLUMNS_IS_NULLABLE,
TMP_TABLE_COLUMNS_COLUMN_KEY, TMP_TABLE_COLUMNS_COLUMN_DEFAULT,
TMP_TABLE_COLUMNS_EXTRA, TMP_TABLE_COLUMNS_PRIVILEGES,
TMP_TABLE_COLUMNS_COLUMN_COMMENT, -1};
int *field_num = fields_arr;
ST_FIELD_INFO *field_info;
Name_resolution_context *context = &thd->lex->select_lex->context;
for (; *field_num >= 0; field_num++) {
field_info = &schema_table->fields_info[*field_num];
if (!thd->lex->verbose && (*field_num == TMP_TABLE_COLUMNS_COLLATION_NAME ||
*field_num == TMP_TABLE_COLUMNS_PRIVILEGES ||
*field_num == TMP_TABLE_COLUMNS_COLUMN_COMMENT))
continue;
Item_field *field =
new Item_field(context, NullS, NullS, field_info->field_name);
if (field) {
field->item_name.copy(field_info->old_name);
if (add_item_to_list(thd, field)) return 1;
}
}
return 0;
}
/**
Create information_schema table
@param thd thread handler
@param lex pointer to LEX
@param table_list pointer to table_list
@return true on error, false otherwise.
*/
bool mysql_schema_table(THD *thd, LEX *lex, TABLE_LIST *table_list) {
TABLE *table;
DBUG_TRACE;
if (!(table = table_list->schema_table->create_table(thd, table_list)))
return 1;
table->s->tmp_table = SYSTEM_TMP_TABLE;
table_list->grant.privilege = SELECT_ACL;
/*
This test is necessary to make
case insensitive file systems +
upper case table names(information schema tables) +
views
working correctly
*/
if (table_list->schema_table_name)
table->alias_name_used = my_strcasecmp(
table_alias_charset, table_list->schema_table_name, table_list->alias);
table_list->table_name = table->s->table_name.str;
table_list->table_name_length = table->s->table_name.length;
table_list->table = table;
table->pos_in_table_list = table_list;
if (table_list->select_lex->first_execution)
table_list->select_lex->add_base_options(OPTION_SCHEMA_TABLE);
lex->safe_to_cache_query = 0;
if (table_list->schema_table_reformed) // show command
{
SELECT_LEX *sel = lex->current_select();
Item *item;
Field_translator *transl, *org_transl;
ulonglong want_privilege_saved = thd->want_privilege;
thd->want_privilege = SELECT_ACL;
enum enum_mark_columns save_mark_used_columns = thd->mark_used_columns;
thd->mark_used_columns = MARK_COLUMNS_READ;
if (table_list->field_translation) {
Field_translator *end = table_list->field_translation_end;
for (transl = table_list->field_translation; transl < end; transl++) {
if (!transl->item->fixed &&
transl->item->fix_fields(thd, &transl->item))
return true;
}
thd->want_privilege = want_privilege_saved;
thd->mark_used_columns = save_mark_used_columns;
return false;
}
List_iterator_fast<Item> it(sel->item_list);
if (!(transl = (Field_translator *)(thd->stmt_arena->alloc(
sel->item_list.elements * sizeof(Field_translator))))) {
return true;
}
for (org_transl = transl; (item = it++); transl++) {
transl->item = item;
transl->name = item->item_name.ptr();
if (!item->fixed && item->fix_fields(thd, &transl->item)) {
return true;
}
}
thd->want_privilege = want_privilege_saved;
thd->mark_used_columns = save_mark_used_columns;
table_list->field_translation = org_transl;
table_list->field_translation_end = transl;
}
return false;
}
/**
Generate select from information_schema table
@param thd thread handler
@param sel pointer to SELECT_LEX
@param schema_table_idx index of 'schema_tables' element
@return true on error, false otherwise
*/
bool make_schema_select(THD *thd, SELECT_LEX *sel,
enum enum_schema_tables schema_table_idx) {
ST_SCHEMA_TABLE *schema_table = get_schema_table(schema_table_idx);
LEX_STRING db, table;
DBUG_TRACE;
DBUG_PRINT("enter", ("mysql_schema_select: %s", schema_table->table_name));
/*
We have to make non const db_name & table_name
because of lower_case_table_names
*/
lex_string_strmake(thd->mem_root, &db, INFORMATION_SCHEMA_NAME.str,
INFORMATION_SCHEMA_NAME.length);
lex_string_strmake(thd->mem_root, &table, schema_table->table_name,
strlen(schema_table->table_name));
if (schema_table->old_format(thd, schema_table) || /* Handle old syntax */
!sel->add_table_to_list(thd,
new (thd->mem_root) Table_ident(
thd->get_protocol(), to_lex_cstring(db),
to_lex_cstring(table), false),
nullptr, 0, TL_READ, MDL_SHARED_READ)) {
return true;
}
return false;
}
/**
Fill INFORMATION_SCHEMA-table, leave correct Diagnostics_area
state after itself.
This function is a wrapper around ST_SCHEMA_TABLE::fill_table(), which
may "partially silence" some errors. The thing is that during
fill_table() many errors might be emitted. These errors stem from the
nature of fill_table().
For example, SELECT ... FROM INFORMATION_SCHEMA.xxx WHERE TABLE_NAME = 'xxx'
results in a number of 'Table @<db name@>.xxx does not exist' errors,
because fill_table() tries to open the 'xxx' table in every possible
database.
Those errors are cleared (the error status is cleared from
Diagnostics_area) inside fill_table(), but they remain in the
Diagnostics_area condition list (the list is not cleared because
it may contain useful warnings).
This function is responsible for making sure that Diagnostics_area
does not contain warnings corresponding to the cleared errors.
@note: THD::no_warnings_for_error used to be set before calling
fill_table(), thus those errors didn't go to Diagnostics_area. This is not
the case now (THD::no_warnings_for_error was eliminated as a hack), so we
need to take care of those warnings here.
@param thd Thread context.
@param table_list I_S table.
@param qep_tab JOIN/SELECT table.
@return Error status.
@retval true Error.
@retval false Success.
*/
bool do_fill_information_schema_table(THD *thd, TABLE_LIST *table_list,
QEP_TAB *qep_tab) {
/*
Return if there is already an error reported.
This situation occurs because there are few functions
that return success, even after reporting error as
mentioned in Bug#25642468. The following check would
be removed by fix for Bug#25642468.
*/
if (thd->is_error()) return true;
// NOTE: fill_table() may generate many "useless" warnings, which will be
// ignored afterwards. On the other hand, there might be "useful"
// warnings, which should be presented to the user. Diagnostics_area usually
// stores no more than THD::variables.max_error_count warnings.
// The problem is that "useless warnings" may occupy all the slots in the
// Diagnostics_area, so "useful warnings" get rejected. In order to avoid
// that problem we create a Diagnostics_area instance, which is capable of
// storing "unlimited" number of warnings.
Diagnostics_area *da = thd->get_stmt_da();
Diagnostics_area tmp_da(true);
// Don't copy existing conditions from the old DA so we don't get them twice
// when we call copy_non_errors_from_da below.
thd->push_diagnostics_area(&tmp_da, false);
/*
We pass a condition, which can be used to do less file manipulations (for
example, WHERE TABLE_SCHEMA='test' allows to open only directory 'test',
not other database directories). Filling schema tables is done before
QEP_TAB::sort_table() (=filesort, for ORDER BY), so we can trust
that condition() is complete, has not been zeroed by filesort:
*/
DBUG_ASSERT(qep_tab->condition() == qep_tab->condition_optim());
bool res = table_list->schema_table->fill_table(thd, table_list,
qep_tab->condition());
thd->pop_diagnostics_area();
// Pass an error if any.
if (tmp_da.is_error()) {
da->set_error_status(tmp_da.mysql_errno(), tmp_da.message_text(),
tmp_da.returned_sqlstate());
da->push_warning(thd, tmp_da.mysql_errno(), tmp_da.returned_sqlstate(),
Sql_condition::SL_ERROR, tmp_da.message_text());
}
// Pass warnings (if any).
//
// Filter out warnings with SL_ERROR level, because they
// correspond to the errors which were filtered out in fill_table().
da->copy_non_errors_from_da(thd, &tmp_da);
return res;
}
/*
Fill temporary schema tables before SELECT
SYNOPSIS
get_schema_tables_result()
join join which use schema tables
executed_place place where I_S table processed
RETURN
false success
true error
*/
bool get_schema_tables_result(JOIN *join,
enum enum_schema_table_state executed_place) {
THD *thd = join->thd;
bool result = false;
DBUG_TRACE;
/* Check if the schema table is optimized away */
if (!join->qep_tab) return result;
for (uint i = 0; i < join->tables; i++) {
QEP_TAB *const tab = join->qep_tab + i;
if (!tab->table() || !tab->table_ref) continue;
TABLE_LIST *const table_list = tab->table_ref;
if (table_list->schema_table && thd->fill_information_schema_tables()) {
bool is_subselect = join->select_lex->master_unit() &&
join->select_lex->master_unit()->item;
/* A value of 0 indicates a dummy implementation */
if (table_list->schema_table->fill_table == 0) continue;
/* skip I_S optimizations specific to show_temporary_tables */
if (thd->lex->is_explain() &&
(table_list->schema_table->fill_table != show_temporary_tables))
continue;
/*
If schema table is already processed and
the statement is not a subselect then
we don't need to fill this table again.
If schema table is already processed and
schema_table_state != executed_place then
table is already processed and
we should skip second data processing.
*/
if (table_list->schema_table_state &&
(!is_subselect || table_list->schema_table_state != executed_place))
continue;
/*
if table is used in a subselect and
table has been processed earlier with the same
'executed_place' value then we should refresh the table.
*/
if (table_list->schema_table_state && is_subselect) {
table_list->table->file->ha_extra(HA_EXTRA_RESET_STATE);
table_list->table->file->ha_delete_all_rows();
free_io_cache(table_list->table);
table_list->table->set_not_started();
} else
table_list->table->file->stats.records = 0;
if (do_fill_information_schema_table(thd, table_list, tab)) {
result = true;
join->error = 1;
table_list->schema_table_state = executed_place;
break;
}
table_list->schema_table_state = executed_place;
}
}
return result;
}
struct run_hton_fill_schema_table_args {
TABLE_LIST *tables;
Item *cond;
};
static bool run_hton_fill_schema_table(THD *thd, plugin_ref plugin, void *arg) {
struct run_hton_fill_schema_table_args *args =
(run_hton_fill_schema_table_args *)arg;
handlerton *hton = plugin_data<handlerton *>(plugin);
if (hton->fill_is_table && hton->state == SHOW_OPTION_YES)
hton->fill_is_table(hton, thd, args->tables, args->cond,
get_schema_table_idx(args->tables->schema_table));
return false;
}
static int hton_fill_schema_table(THD *thd, TABLE_LIST *tables, Item *cond) {
DBUG_TRACE;
struct run_hton_fill_schema_table_args args;
args.tables = tables;
args.cond = cond;
plugin_foreach(thd, run_hton_fill_schema_table, MYSQL_STORAGE_ENGINE_PLUGIN,
&args);
return 0;
}
ST_FIELD_INFO engines_fields_info[] = {
{"ENGINE", 64, MYSQL_TYPE_STRING, 0, 0, "Engine", 0},
{"SUPPORT", 8, MYSQL_TYPE_STRING, 0, 0, "Support", 0},
{"COMMENT", 80, MYSQL_TYPE_STRING, 0, 0, "Comment", 0},
{"TRANSACTIONS", 3, MYSQL_TYPE_STRING, 0, 1, "Transactions", 0},
{"XA", 3, MYSQL_TYPE_STRING, 0, 1, "XA", 0},
{"SAVEPOINTS", 3, MYSQL_TYPE_STRING, 0, 1, "Savepoints", 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO tmp_table_keys_fields_info[] = {
{"TABLE_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Table", 0},
{"NON_UNIQUE", 1, MYSQL_TYPE_LONGLONG, 0, 0, "Non_unique", 0},
{"INDEX_SCHEMA", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"INDEX_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Key_name", 0},
{"SEQ_IN_INDEX", 2, MYSQL_TYPE_LONGLONG, 0, 0, "Seq_in_index", 0},
{"COLUMN_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Column_name", 0},
{"COLLATION", 1, MYSQL_TYPE_STRING, 0, 1, "Collation", 0},
{"CARDINALITY", MY_INT64_NUM_DECIMAL_DIGITS, MYSQL_TYPE_LONGLONG, 0, 1,
"Cardinality", 0},
{"SUB_PART", 3, MYSQL_TYPE_LONGLONG, 0, 1, "Sub_part", 0},
{"PACKED", 10, MYSQL_TYPE_STRING, 0, 1, "Packed", 0},
{"NULLABLE", 3, MYSQL_TYPE_STRING, 0, 0, "Null", 0},
{"INDEX_TYPE", 16, MYSQL_TYPE_STRING, 0, 0, "Index_type", 0},
{"COMMENT", 16, MYSQL_TYPE_STRING, 0, 1, "Comment", 0},
{"INDEX_COMMENT", INDEX_COMMENT_MAXLEN, MYSQL_TYPE_STRING, 0, 0,
"Index_comment", 0},
{"IS_VISIBLE", 4, MYSQL_TYPE_STRING, 0, 1, "Visible", 0},
{"EXPRESSION", MAX_FIELD_BLOBLENGTH, MYSQL_TYPE_STRING, 0, 1, "Expression",
0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
/**
Grantee is of form 'user'@'hostname', so add +1 for '@' and +4 for the
single qoutes.
*/
static const int GRANTEE_MAX_CHAR_LENGTH =
USERNAME_CHAR_LENGTH + 1 + HOSTNAME_LENGTH + 4;
ST_FIELD_INFO user_privileges_fields_info[] = {
{"GRANTEE", GRANTEE_MAX_CHAR_LENGTH, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_CATALOG", FN_REFLEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"PRIVILEGE_TYPE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"IS_GRANTABLE", 3, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO schema_privileges_fields_info[] = {
{"GRANTEE", GRANTEE_MAX_CHAR_LENGTH, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_CATALOG", FN_REFLEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_SCHEMA", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"PRIVILEGE_TYPE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"IS_GRANTABLE", 3, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO table_privileges_fields_info[] = {
{"GRANTEE", GRANTEE_MAX_CHAR_LENGTH, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_CATALOG", FN_REFLEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_SCHEMA", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"PRIVILEGE_TYPE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"IS_GRANTABLE", 3, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO column_privileges_fields_info[] = {
{"GRANTEE", GRANTEE_MAX_CHAR_LENGTH, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_CATALOG", FN_REFLEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_SCHEMA", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLE_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"COLUMN_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"PRIVILEGE_TYPE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"IS_GRANTABLE", 3, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO open_tables_fields_info[] = {
{"Database", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Database", 0},
{"Table", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Table", 0},
{"In_use", 1, MYSQL_TYPE_LONGLONG, 0, 0, "In_use", 0},
{"Name_locked", 4, MYSQL_TYPE_LONGLONG, 0, 0, "Name_locked", 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO processlist_fields_info[] = {
{"ID", 21, MYSQL_TYPE_LONGLONG, 0, MY_I_S_UNSIGNED, "Id", 0},
{"USER", USERNAME_CHAR_LENGTH, MYSQL_TYPE_STRING, 0, 0, "User", 0},
{"HOST", HOST_AND_PORT_LENGTH - 1, MYSQL_TYPE_STRING, 0, 0, "Host", 0},
{"DB", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 1, "Db", 0},
{"COMMAND", 16, MYSQL_TYPE_STRING, 0, 0, "Command", 0},
{"TIME", 7, MYSQL_TYPE_LONG, 0, 0, "Time", 0},
{"STATE", 64, MYSQL_TYPE_STRING, 0, 1, "State", 0},
{"INFO", PROCESS_LIST_INFO_WIDTH, MYSQL_TYPE_STRING, 0, 1, "Info", 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO plugin_fields_info[] = {
{"PLUGIN_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Name", 0},
{"PLUGIN_VERSION", 20, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"PLUGIN_STATUS", 10, MYSQL_TYPE_STRING, 0, 0, "Status", 0},
{"PLUGIN_TYPE", 80, MYSQL_TYPE_STRING, 0, 0, "Type", 0},
{"PLUGIN_TYPE_VERSION", 20, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"PLUGIN_LIBRARY", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 1, "Library", 0},
{"PLUGIN_LIBRARY_VERSION", 20, MYSQL_TYPE_STRING, 0, 1, 0, 0},
{"PLUGIN_AUTHOR", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 1, 0, 0},
{"PLUGIN_DESCRIPTION", 65535, MYSQL_TYPE_STRING, 0, 1, 0, 0},
{"PLUGIN_LICENSE", 80, MYSQL_TYPE_STRING, 0, 1, "License", 0},
{"LOAD_OPTION", 64, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO tablespaces_fields_info[] = {
{"TABLESPACE_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"ENGINE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0},
{"TABLESPACE_TYPE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, MY_I_S_MAYBE_NULL,
0, 0},
{"LOGFILE_GROUP_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0,
MY_I_S_MAYBE_NULL, 0, 0},
{"EXTENT_SIZE", 21, MYSQL_TYPE_LONGLONG, 0,
MY_I_S_MAYBE_NULL | MY_I_S_UNSIGNED, 0, 0},
{"AUTOEXTEND_SIZE", 21, MYSQL_TYPE_LONGLONG, 0,
MY_I_S_MAYBE_NULL | MY_I_S_UNSIGNED, 0, 0},
{"MAXIMUM_SIZE", 21, MYSQL_TYPE_LONGLONG, 0,
MY_I_S_MAYBE_NULL | MY_I_S_UNSIGNED, 0, 0},
{"NODEGROUP_ID", 21, MYSQL_TYPE_LONGLONG, 0,
MY_I_S_MAYBE_NULL | MY_I_S_UNSIGNED, 0, 0},
{"TABLESPACE_COMMENT", 2048, MYSQL_TYPE_STRING, 0, MY_I_S_MAYBE_NULL, 0, 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
ST_FIELD_INFO tmp_table_columns_fields_info[] = {
{"COLUMN_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Field", 0},
{"COLUMN_TYPE", 65535, MYSQL_TYPE_STRING, 0, 0, "Type", 0},
{"COLLATION_NAME", MY_CS_NAME_SIZE, MYSQL_TYPE_STRING, 0, 1, "Collation",
0},
{"IS_NULLABLE", 3, MYSQL_TYPE_STRING, 0, 0, "Null", 0},
{"COLUMN_KEY", 3, MYSQL_TYPE_STRING, 0, 0, "Key", 0},
{"COLUMN_DEFAULT", MAX_FIELD_VARCHARLENGTH, MYSQL_TYPE_STRING, 0, 1,
"Default", 0},
{"EXTRA", 30, MYSQL_TYPE_STRING, 0, 0, "Extra", 0},
{"PRIVILEGES", 80, MYSQL_TYPE_STRING, 0, 0, "Privileges", 0},
{"COLUMN_COMMENT", COLUMN_COMMENT_MAXLEN, MYSQL_TYPE_STRING, 0, 0,
"Comment", 0},
{"GENERATION_EXPRESSION", GENERATED_COLUMN_EXPRESSION_MAXLEN,
MYSQL_TYPE_STRING, 0, 0, "Generation expression", 0},
{0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}};
/** For creating fields of information_schema.OPTIMIZER_TRACE */
extern ST_FIELD_INFO optimizer_trace_info[];
/*
Description of ST_FIELD_INFO in table.h
Make sure that the order of schema_tables and enum_schema_tables are the same.
*/
ST_SCHEMA_TABLE schema_tables[] = {
{"COLUMN_PRIVILEGES", column_privileges_fields_info, create_schema_table,
fill_schema_column_privileges, nullptr, nullptr, -1, -1, false, 0},
{"ENGINES", engines_fields_info, create_schema_table, fill_schema_engines,
make_old_format, nullptr, -1, -1, false, 0},
{"OPEN_TABLES", open_tables_fields_info, create_schema_table,
fill_open_tables, make_old_format, nullptr, -1, -1, true, 0},
{"OPTIMIZER_TRACE", optimizer_trace_info, create_schema_table,
fill_optimizer_trace_info, nullptr, nullptr, -1, -1, false, 0},
{"PLUGINS", plugin_fields_info, create_schema_table, fill_plugins,
make_old_format, nullptr, -1, -1, false, 0},
{"PROCESSLIST", processlist_fields_info, create_schema_table,
fill_schema_processlist, make_old_format, nullptr, -1, -1, false, 0},
{"PROFILING", query_profile_statistics_info, create_schema_table,
fill_query_profile_statistics_info, make_profile_table_for_show, nullptr,
-1, -1, false, 0},
{"SCHEMA_PRIVILEGES", schema_privileges_fields_info, create_schema_table,
fill_schema_schema_privileges, nullptr, nullptr, -1, -1, false, 0},
{"TABLESPACES", tablespaces_fields_info, create_schema_table,
hton_fill_schema_table, nullptr, nullptr, -1, -1, false, 0},
{"TABLE_PRIVILEGES", table_privileges_fields_info, create_schema_table,
fill_schema_table_privileges, nullptr, nullptr, -1, -1, false, 0},
{"USER_PRIVILEGES", user_privileges_fields_info, create_schema_table,
fill_schema_user_privileges, nullptr, nullptr, -1, -1, false, 0},
{"TMP_TABLE_COLUMNS", tmp_table_columns_fields_info, create_schema_table,
show_temporary_tables, make_tmp_table_columns_format,
get_schema_tmp_table_columns_record, -1, -1, true, 0},
{"TMP_TABLE_KEYS", tmp_table_keys_fields_info, create_schema_table,
show_temporary_tables, make_old_format, get_schema_tmp_table_keys_record,
-1, -1, true, 0},
{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, 0, 0, false, 0}};
int initialize_schema_table(st_plugin_int *plugin) {
ST_SCHEMA_TABLE *schema_table;
DBUG_TRACE;
if (!(schema_table = (ST_SCHEMA_TABLE *)my_malloc(key_memory_ST_SCHEMA_TABLE,
sizeof(ST_SCHEMA_TABLE),
MYF(MY_WME | MY_ZEROFILL))))
return 1;
/* Historical Requirement */
plugin->data = schema_table; // shortcut for the future
if (plugin->plugin->init) {
schema_table->create_table = create_schema_table;
schema_table->old_format = make_old_format;
schema_table->idx_field1 = -1, schema_table->idx_field2 = -1;
/* Make the name available to the init() function. */
schema_table->table_name = plugin->name.str;
if (plugin->plugin->init(schema_table)) {
LogErr(ERROR_LEVEL, ER_PLUGIN_INIT_FAILED, plugin->name.str);
plugin->data = NULL;
my_free(schema_table);
return 1;
}
/* Make sure the plugin name is not set inside the init() function. */
schema_table->table_name = plugin->name.str;
}
return 0;
}
int finalize_schema_table(st_plugin_int *plugin) {
ST_SCHEMA_TABLE *schema_table = (ST_SCHEMA_TABLE *)plugin->data;
DBUG_TRACE;
if (schema_table) {
if (plugin->plugin->deinit) {
DBUG_PRINT("info", ("Deinitializing plugin: '%s'", plugin->name.str));
if (plugin->plugin->deinit(NULL)) {
DBUG_PRINT("warning", ("Plugin '%s' deinit function returned error.",
plugin->name.str));
}
}
my_free(schema_table);
}
return 0;
}
/**
Output trigger information (SHOW CREATE TRIGGER) to the client.
@param thd Thread context.
@param trigger table trigger to dump.
@return Operation status
@retval true Error.
@retval false Success.
*/
static bool show_create_trigger_impl(THD *thd, Trigger *trigger) {
Protocol *p = thd->get_protocol();
List<Item> fields;
// Construct sql_mode string.
LEX_STRING sql_mode_str;
if (sql_mode_string_representation(thd, trigger->get_sql_mode(),
&sql_mode_str))
return true;
char create_trg_str_buf[10 * STRING_BUFFER_USUAL_SIZE];
String create_trg_str(create_trg_str_buf, sizeof(create_trg_str_buf),
system_charset_info);
create_trg_str.length(0);
/*
NOTE: SQL statement field must be not less than 1024 in order not to
confuse old clients.
*/
Item_empty_string *stmt_fld = new Item_empty_string(
"SQL Original Statement", max<size_t>(create_trg_str.length(), 1024));
if (stmt_fld == nullptr) return true;
if (trigger->create_full_trigger_definition(thd, &create_trg_str))
return true;
stmt_fld->maybe_null = true;
// Send header.
if (fields.push_back(new Item_empty_string("Trigger", NAME_LEN)) ||
fields.push_back(
new Item_empty_string("sql_mode", sql_mode_str.length)) ||
fields.push_back(stmt_fld) ||
fields.push_back(
new Item_empty_string("character_set_client", MY_CS_NAME_SIZE)) ||
fields.push_back(
new Item_empty_string("collation_connection", MY_CS_NAME_SIZE)) ||
fields.push_back(
new Item_empty_string("Database Collation", MY_CS_NAME_SIZE)) ||
fields.push_back(new Item_temporal(
MYSQL_TYPE_TIMESTAMP, Name_string("Created", sizeof("created") - 1),
0, 0)) ||
thd->send_result_metadata(&fields,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
return true;
// Resolve trigger client character set.
const CHARSET_INFO *client_cs;
if (resolve_charset(trigger->get_client_cs_name().str, NULL, &client_cs))
return true;
// Send data.
p->start_row();
if (p->store_string(trigger->get_trigger_name().str,
trigger->get_trigger_name().length,
system_charset_info) ||
p->store(sql_mode_str, system_charset_info) ||
p->store_string(create_trg_str.c_ptr(), create_trg_str.length(),
client_cs) ||
p->store_string(trigger->get_client_cs_name().str,
trigger->get_client_cs_name().length,
system_charset_info) ||
p->store_string(trigger->get_connection_cl_name().str,
trigger->get_connection_cl_name().length,
system_charset_info) ||
p->store_string(trigger->get_db_cl_name().str,
trigger->get_db_cl_name().length, system_charset_info))
return true;
bool rc;
if (!trigger->is_created_timestamp_null()) {
MYSQL_TIME timestamp;
my_tz_SYSTEM->gmt_sec_to_TIME(&timestamp, trigger->get_created_timestamp());
rc = p->store_datetime(timestamp, 2);
} else
rc = p->store_null();
if (rc || p->end_row()) return true;
my_eof(thd);
return false;
}
/**
Read the Data Dictionary to obtain base table name for the specified
trigger name and construct TABE_LIST object for the base table.
@param thd Thread context.
@param trg_name Trigger name.
@return TABLE_LIST object corresponding to the base table.
TODO: This function is a copy&paste from add_table_to_list() and
sp_add_to_query_tables(). The problem is that in order to be compatible
with Stored Programs (Prepared Statements), we should not touch thd->lex.
The "source" functions also add created TABLE_LIST object to the
thd->lex->query_tables.
The plan to eliminate this copy&paste is to:
- get rid of sp_add_to_query_tables() and use Lex::add_table_to_list().
Only add_table_to_list() must be used to add tables from the parser
into Lex::query_tables list.
- do not update Lex::query_tables in add_table_to_list().
*/
static TABLE_LIST *get_trigger_table(THD *thd, const sp_name *trg_name) {
LEX_CSTRING db;
LEX_STRING tbl_name;
dd::Schema_MDL_locker mdl_locker(thd);
dd::cache::Dictionary_client *dd_client = thd->dd_client();
dd::cache::Dictionary_client::Auto_releaser releaser(dd_client);
const dd::Schema *sch_obj = nullptr;
if (mdl_locker.ensure_locked(trg_name->m_db.str) ||
dd_client->acquire(trg_name->m_db.str, &sch_obj))
return nullptr;
if (sch_obj == nullptr) {
my_error(ER_BAD_DB_ERROR, MYF(0), trg_name->m_db.str);
return nullptr;
}
dd::String_type table_name;
if (dd_client->get_table_name_by_trigger_name(*sch_obj, trg_name->m_name.str,
&table_name))
return nullptr;
if (table_name == "") {
my_error(ER_TRG_DOES_NOT_EXIST, MYF(0));
return nullptr;
}
db = trg_name->m_db;
db.str = thd->strmake(db.str, db.length);
char lc_table_name[NAME_LEN + 1];
const char *table_name_ptr = table_name.c_str();
if (lower_case_table_names == 2) {
my_stpncpy(lc_table_name, table_name.c_str(), NAME_LEN);
my_casedn_str(files_charset_info, lc_table_name);
lc_table_name[NAME_LEN] = '\0';
table_name_ptr = lc_table_name;
}
size_t table_name_length = strlen(table_name_ptr);
tbl_name.str = thd->strmake(table_name_ptr, table_name_length);
tbl_name.length = table_name_length;
if (db.str == nullptr || tbl_name.str == nullptr) return nullptr;
/* We need to reset statement table list to be PS/SP friendly. */
return new (thd->mem_root)
TABLE_LIST(db.str, db.length, tbl_name.str, tbl_name.length, tbl_name.str,
TL_IGNORE);
}
/**
Acquire shared MDL lock for a specified database name/table name.
@param thd Thread context.
@param db_name Database name.
@param table_name Table name.
@return Operation status
@retval true Error.
@retval false Success.
*/
static bool acquire_mdl_for_table(THD *thd, const char *db_name,
const char *table_name) {
MDL_request table_request;
MDL_REQUEST_INIT(&table_request, MDL_key::TABLE, db_name, table_name,
MDL_SHARED, MDL_TRANSACTION);
if (thd->mdl_context.acquire_lock(&table_request,
thd->variables.lock_wait_timeout))
return true;
return false;
}
/**
SHOW CREATE TRIGGER high-level implementation.
@param thd Thread context.
@param trg_name Trigger name.
@return Operation status
@retval true Error.
@retval false Success.
*/
bool show_create_trigger(THD *thd, const sp_name *trg_name) {
uint num_tables; /* NOTE: unused, only to pass to open_tables(). */
bool error = true;
Trigger *trigger;
/*
Metadata locks taken during SHOW CREATE TRIGGER should be released when
the statement completes as it is an information statement.
*/
MDL_savepoint mdl_savepoint = thd->mdl_context.mdl_savepoint();
if (acquire_shared_mdl_for_trigger(thd, trg_name->m_db.str,
trg_name->m_name.str))
return true;
TABLE_LIST *lst = get_trigger_table(thd, trg_name);
if (!lst) return true;
if (check_table_access(thd, TRIGGER_ACL, lst, false, 1, true)) {
my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "TRIGGER");
return true;
}
DEBUG_SYNC(thd, "show_create_trigger_before_table_lock");
if (acquire_mdl_for_table(thd, trg_name->m_db.str, lst->table_name))
return true;
/*
Open the table by name in order to load Table_trigger_dispatcher object.
*/
if (open_tables(thd, &lst, &num_tables,
MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL)) {
my_error(ER_TRG_CANT_OPEN_TABLE, MYF(0), trg_name->m_db.str,
lst->table_name);
goto exit;
/* Perform closing actions and return error status. */
}
if (!lst->table->triggers) {
my_error(ER_TRG_DOES_NOT_EXIST, MYF(0));
goto exit;
}
trigger = lst->table->triggers->find_trigger(trg_name->m_name);
if (!trigger) {
my_error(ER_TRG_CORRUPTED_FILE, MYF(0), trg_name->m_db.str,
lst->table_name);
goto exit;
}
error = show_create_trigger_impl(thd, trigger);
/*
NOTE: if show_create_trigger_impl() failed, that means we could not
send data to the client. In this case we simply raise the error
status and client connection will be closed.
*/
exit:
close_thread_tables(thd);
/* Release any metadata locks taken during SHOW CREATE TRIGGER. */
thd->mdl_context.rollback_to_savepoint(mdl_savepoint);
return error;
}
static IS_internal_schema_access is_internal_schema_access;
void initialize_information_schema_acl() {
ACL_internal_schema_registry::register_schema(INFORMATION_SCHEMA_NAME,
&is_internal_schema_access);
}
/*
Convert a string in character set in column character set format
to utf8 character set if possible, the utf8 character set string
will later possibly be converted to character set used by client.
Thus we attempt conversion from column character set to both
utf8 and to character set client.
Examples of strings that should fail conversion to utf8 are unassigned
characters as e.g. 0x81 in cp1250 (Windows character set for for countries
like Czech and Poland). Example of string that should fail conversion to
character set on client (e.g. if this is latin1) is 0x2020 (daggger) in
ucs2.
If the conversion fails we will as a fall back convert the string to
hex encoded format. The caller of the function can also ask for hex
encoded format of output string unconditionally.
SYNOPSIS
get_cs_converted_string_value()
thd Thread object
input_str Input string in cs character set
output_str Output string to be produced in utf8
cs Character set of input string
use_hex Use hex string unconditionally
RETURN VALUES
No return value
*/
static void get_cs_converted_string_value(THD *thd, String *input_str,
String *output_str,
const CHARSET_INFO *cs,
bool use_hex) {
output_str->length(0);
if (input_str->length() == 0) {
output_str->append("''");
return;
}
// Note that since the String charset conversion functions used below, are
// created to be used as (potentially unsafe) "casts" for user data, they
// perform conversion from binary to UTF-8 by simply copying bytes. By
// forcing a hex string when cs is binary, we avoid creating strings that are
// invalid. Such invalid strings looks strange and will cause asserts when
// they are stored in TEXT columns in the DD.
if (!use_hex && cs != &my_charset_bin) {
String try_val;
uint try_conv_error = 0;
try_val.copy(input_str->ptr(), input_str->length(), cs,
thd->variables.character_set_client, &try_conv_error);
if (!try_conv_error) {
String val;
uint conv_error = 0;
val.copy(input_str->ptr(), input_str->length(), cs, system_charset_info,
&conv_error);
if (!conv_error) {
append_unescaped(output_str, val.ptr(), val.length());
return;
}
}
/* We had a conversion error, use hex encoded string for safety */
}
{
const uchar *ptr;
size_t i, len;
char buf[3];
output_str->append("_");
output_str->append(cs->csname);
output_str->append(" ");
output_str->append("0x");
len = input_str->length();
ptr = (uchar *)input_str->ptr();
for (i = 0; i < len; i++) {
uint high, low;
high = (*ptr) >> 4;
low = (*ptr) & 0x0F;
buf[0] = _dig_vec_upper[high];
buf[1] = _dig_vec_upper[low];
buf[2] = 0;
output_str->append((const char *)buf);
ptr++;
}
}
return;
}
/**
A field's SQL type printout
@param type the type to print
@param is_array whether the field is a typed array
@param metadata field's metadata, depending on the type
could be nothing, length, or length + decimals
@param str String to print to
@param field_cs field's charset. When given [var]char length is printed in
characters, otherwise - in bytes
*/
void show_sql_type(enum_field_types type, bool is_array, uint metadata,
String *str, const CHARSET_INFO *field_cs) {
DBUG_TRACE;
DBUG_PRINT("enter", ("type: %d, metadata: 0x%x", type, metadata));
switch (type) {
case MYSQL_TYPE_TINY:
str->set_ascii(STRING_WITH_LEN("tinyint"));
break;
case MYSQL_TYPE_SHORT:
str->set_ascii(STRING_WITH_LEN("smallint"));
break;
case MYSQL_TYPE_LONG:
str->set_ascii(STRING_WITH_LEN("int"));
break;
case MYSQL_TYPE_FLOAT:
str->set_ascii(STRING_WITH_LEN("float"));
break;
case MYSQL_TYPE_DOUBLE:
str->set_ascii(STRING_WITH_LEN("double"));
break;
case MYSQL_TYPE_NULL:
str->set_ascii(STRING_WITH_LEN("null"));
break;
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_TIMESTAMP2:
str->set_ascii(STRING_WITH_LEN("timestamp"));
break;
case MYSQL_TYPE_LONGLONG:
str->set_ascii(STRING_WITH_LEN("bigint"));
break;
case MYSQL_TYPE_INT24:
str->set_ascii(STRING_WITH_LEN("mediumint"));
break;
case MYSQL_TYPE_NEWDATE:
case MYSQL_TYPE_DATE:
str->set_ascii(STRING_WITH_LEN("date"));
break;
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_TIME2:
str->set_ascii(STRING_WITH_LEN("time"));
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_DATETIME2:
str->set_ascii(STRING_WITH_LEN("datetime"));
break;
case MYSQL_TYPE_YEAR:
str->set_ascii(STRING_WITH_LEN("year"));
break;
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_VARCHAR: {
const CHARSET_INFO *cs = str->charset();
size_t length;
if (field_cs)
length =
cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"varchar(%u)", metadata / field_cs->mbmaxlen);
else
length = cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"varchar(%u(bytes))", metadata);
str->length(length);
} break;
case MYSQL_TYPE_BIT: {
const CHARSET_INFO *cs = str->charset();
int bit_length = 8 * (metadata >> 8) + (metadata & 0xFF);
size_t length = cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"bit(%d)", bit_length);
str->length(length);
} break;
case MYSQL_TYPE_DECIMAL: {
const CHARSET_INFO *cs = str->charset();
size_t length = cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"decimal(%d,?)", metadata);
str->length(length);
} break;
case MYSQL_TYPE_NEWDECIMAL: {
const CHARSET_INFO *cs = str->charset();
uint len = (metadata >> 8) & 0xff;
uint dec = metadata & 0xff;
size_t length = cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"decimal(%d,%d)", len, dec);
str->length(length);
} break;
case MYSQL_TYPE_ENUM:
str->set_ascii(STRING_WITH_LEN("enum"));
break;
case MYSQL_TYPE_SET:
str->set_ascii(STRING_WITH_LEN("set"));
break;
case MYSQL_TYPE_TINY_BLOB:
if (!field_cs || field_cs == &my_charset_bin)
str->set_ascii(STRING_WITH_LEN("tinyblob"));
else
str->set_ascii(STRING_WITH_LEN("tinytext"));
break;
case MYSQL_TYPE_MEDIUM_BLOB:
if (!field_cs || field_cs == &my_charset_bin)
str->set_ascii(STRING_WITH_LEN("mediumblob"));
else
str->set_ascii(STRING_WITH_LEN("mediumtext"));
break;
case MYSQL_TYPE_LONG_BLOB:
if (!field_cs || field_cs == &my_charset_bin)
str->set_ascii(STRING_WITH_LEN("longblob"));
else
str->set_ascii(STRING_WITH_LEN("longtext"));
break;
case MYSQL_TYPE_BLOB:
/*
Field::real_type() lies regarding the actual type of a BLOB, so
it is necessary to check the pack length to figure out what kind
of blob it really is.
Non-'BLOB' is handled above.
*/
switch (metadata) {
case 1:
str->set_ascii(STRING_WITH_LEN("tinyblob"));
break;
case 3:
str->set_ascii(STRING_WITH_LEN("mediumblob"));
break;
case 4:
str->set_ascii(STRING_WITH_LEN("longblob"));
break;
default:
case 2:
if (!field_cs || field_cs == &my_charset_bin)
str->set_ascii(STRING_WITH_LEN("blob"));
else
str->set_ascii(STRING_WITH_LEN("text"));
break;
}
break;
case MYSQL_TYPE_STRING: {
/*
This is taken from Field_string::unpack.
*/
const CHARSET_INFO *cs = str->charset();
uint bytes = (((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0x00ff);
size_t length;
if (field_cs)
length = cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"char(%d)", bytes / field_cs->mbmaxlen);
else
length = cs->cset->snprintf(cs, str->ptr(), str->alloced_length(),
"char(%d(bytes))", bytes);
str->length(length);
} break;
case MYSQL_TYPE_GEOMETRY:
str->set_ascii(STRING_WITH_LEN("geometry"));
break;
case MYSQL_TYPE_JSON:
str->set_ascii(STRING_WITH_LEN("json"));
break;
default:
str->set_ascii(STRING_WITH_LEN("<unknown type>"));
}
if (is_array) str->append(STRING_WITH_LEN(" array"));
}