You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
2.5 KiB
79 lines
2.5 KiB
5 months ago
|
/* Copyright (c) 2005, 2018, 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 */
|
||
|
|
|
||
|
|
#ifndef _sql_cursor_h_
|
||
|
|
#define _sql_cursor_h_
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <new>
|
||
|
|
|
||
|
|
#include "sql/sql_class.h" /* Query_arena */
|
||
|
|
|
||
|
|
class JOIN;
|
||
|
|
class Query_result;
|
||
|
|
struct MEM_ROOT;
|
||
|
|
|
||
|
|
/**
|
||
|
|
@file
|
||
|
|
|
||
|
|
Declarations for implementation of server side cursors. Only
|
||
|
|
read-only non-scrollable cursors are currently implemented.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
Server_side_cursor -- an interface for materialized
|
||
|
|
implementation of cursors. All cursors are self-contained
|
||
|
|
(created in their own memory root). For that reason they must
|
||
|
|
be deleted only using a pointer to Server_side_cursor, not to
|
||
|
|
its base class.
|
||
|
|
*/
|
||
|
|
|
||
|
|
class Server_side_cursor {
|
||
|
|
protected:
|
||
|
|
Query_arena m_arena;
|
||
|
|
/** Row destination used for fetch */
|
||
|
|
Query_result *result;
|
||
|
|
|
||
|
|
public:
|
||
|
|
Server_side_cursor(MEM_ROOT *mem_root_arg, Query_result *result_arg)
|
||
|
|
: m_arena(mem_root_arg, Query_arena::STMT_INITIALIZED),
|
||
|
|
result(result_arg) {}
|
||
|
|
|
||
|
|
virtual bool is_open() const = 0;
|
||
|
|
|
||
|
|
virtual int open(THD *thd, JOIN *top_level_join) = 0;
|
||
|
|
virtual bool fetch(ulong num_rows) = 0;
|
||
|
|
virtual void close() = 0;
|
||
|
|
virtual ~Server_side_cursor();
|
||
|
|
|
||
|
|
static void operator delete(void *ptr, size_t size);
|
||
|
|
static void operator delete(
|
||
|
|
void *, MEM_ROOT *, const std::nothrow_t &)noexcept { /* never called */
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
bool mysql_open_cursor(THD *thd, Query_result *result,
|
||
|
|
Server_side_cursor **res);
|
||
|
|
|
||
|
|
#endif /* _sql_cusor_h_ */
|