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142 lines
4.8 KiB
142 lines
4.8 KiB
/* Copyright (c) 2006, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SQL_DELETE_INCLUDED
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#define SQL_DELETE_INCLUDED
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#include <stddef.h>
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#include <sys/types.h>
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#include "my_base.h" // ha_rows
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#include "my_sqlcommand.h"
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#include "my_table_map.h"
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#include "sql/query_result.h" // Query_result_interceptor
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#include "sql/sql_cmd_dml.h" // Sql_cmd_dml
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class Item;
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class SELECT_LEX_UNIT;
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class THD;
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class Unique;
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struct TABLE;
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struct TABLE_LIST;
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template <class T>
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class List;
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template <typename T>
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class SQL_I_List;
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class Query_result_delete final : public Query_result_interceptor {
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/// Pointers to temporary files used for delayed deletion of rows
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Unique **tempfiles;
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/// Pointers to table objects matching tempfiles
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TABLE **tables;
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/// Number of tables being deleted from
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uint delete_table_count;
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/// Number of rows produced by the join
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ha_rows found_rows;
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/// Number of rows deleted
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ha_rows deleted_rows;
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/// Handler error status for the operation.
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int error;
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/// Map of all tables to delete rows from
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table_map delete_table_map;
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/// Map of tables to delete from immediately
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table_map delete_immediate;
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// Map of transactional tables to be deleted from
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table_map transactional_table_map;
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/// Map of non-transactional tables to be deleted from
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table_map non_transactional_table_map;
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/// True if the full delete operation is complete
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bool delete_completed;
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/// True if some actual delete operation against non-transactional table done
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bool non_transactional_deleted;
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/*
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error handling (rollback and binlogging) can happen in send_eof()
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so that afterward send_error() needs to find out that.
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*/
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bool error_handled;
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public:
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Query_result_delete()
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: Query_result_interceptor(),
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tempfiles(NULL),
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tables(NULL),
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delete_table_count(0),
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found_rows(0),
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deleted_rows(0),
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error(0),
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delete_table_map(0),
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delete_immediate(0),
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transactional_table_map(0),
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non_transactional_table_map(0),
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delete_completed(false),
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non_transactional_deleted(false),
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error_handled(false) {}
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bool need_explain_interceptor() const override { return true; }
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bool prepare(THD *thd, List<Item> &list, SELECT_LEX_UNIT *u) override;
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bool send_data(THD *thd, List<Item> &items) override;
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void send_error(THD *thd, uint errcode, const char *err) override;
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bool optimize() override;
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bool start_execution(THD *) override {
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delete_completed = false;
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return false;
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}
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int do_deletes(THD *thd);
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int do_table_deletes(THD *thd, TABLE *table);
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bool send_eof(THD *thd) override;
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inline ha_rows num_deleted() { return deleted_rows; }
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void abort_result_set(THD *thd) override;
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void cleanup(THD *thd) override;
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};
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class Sql_cmd_delete final : public Sql_cmd_dml {
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public:
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Sql_cmd_delete(bool multitable_arg, SQL_I_List<TABLE_LIST> *delete_tables_arg)
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: multitable(multitable_arg), delete_tables(delete_tables_arg) {}
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enum_sql_command sql_command_code() const override {
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return multitable ? SQLCOM_DELETE_MULTI : SQLCOM_DELETE;
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}
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bool is_single_table_plan() const override { return !multitable; }
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virtual bool accept(THD *thd, Select_lex_visitor *visitor) override;
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protected:
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bool precheck(THD *thd) override;
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bool prepare_inner(THD *thd) override;
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bool execute_inner(THD *thd) override;
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private:
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bool delete_from_single_table(THD *thd);
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bool multitable;
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/**
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References to tables that are deleted from in a multitable delete statement.
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Only used to track such tables from the parser. In preparation and
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optimization, use the TABLE_LIST::updating property instead.
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*/
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SQL_I_List<TABLE_LIST> *delete_tables;
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};
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#endif /* SQL_DELETE_INCLUDED */
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