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cursor is interpreted latin1 character and Bug#9819 "Cursors: Mysql Server Crash while fetching from table with 5 million records." A fix for a possible memory leak when fetching into an SP cursor in a long loop. The patch uses a common implementation of cursors in the binary protocol and in stored procedures and implements materialized cursors. For implementation details, see comments in sql_cursor.cc
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
#ifndef _sql_cursor_h_
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#define _sql_cursor_h_
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/* Copyright (C) 2005 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class interface */
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#endif
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/*
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Declarations for implementation of server side cursors. Only
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read-only non-scrollable cursors are currently implemented.
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*/
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/*
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Server_side_cursor -- an interface for materialized and
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sensitive (non-materialized) implementation of cursors. All
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cursors are self-contained (created in their own memory root).
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For that reason they must be deleted only using a pointer to
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Server_side_cursor, not to its base class.
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*/
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class Server_side_cursor: protected Query_arena, public Sql_alloc
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{
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protected:
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/* Row destination used for fetch */
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select_result *result;
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public:
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Server_side_cursor(MEM_ROOT *mem_root_arg, select_result *result_arg)
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:Query_arena(mem_root_arg, INITIALIZED), result(result_arg)
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{}
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virtual bool is_open() const= 0;
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virtual int open(JOIN *top_level_join)= 0;
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virtual void fetch(ulong num_rows)= 0;
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virtual void close()= 0;
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virtual ~Server_side_cursor();
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static void operator delete(void *ptr, size_t size);
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};
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int mysql_open_cursor(THD *thd, uint flags,
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select_result *result,
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Server_side_cursor **res);
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/* Possible values for flags */
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enum { ANY_CURSOR= 1, ALWAYS_MATERIALIZED_CURSOR= 2 };
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#endif /* _sql_cusor_h_ */
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