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70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/* Copyright (c) 2005, 2011, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#ifndef _sql_cursor_h_
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#define _sql_cursor_h_
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#include "sql_class.h" /* Query_arena */
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class JOIN;
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/**
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@file
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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
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implementation of cursors. All cursors are self-contained
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(created in their own memory root). For that reason they must
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be deleted only using a pointer to Server_side_cursor, not to
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its base class.
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*/
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class Server_side_cursor: protected Query_arena
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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, STMT_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 bool export_structure(THD *thd, Row_definition_list *defs)
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{
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DBUG_ASSERT(0);
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return true;
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}
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virtual ~Server_side_cursor();
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static void *operator new(size_t size, MEM_ROOT *mem_root)
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{ return alloc_root(mem_root, size); }
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static void operator delete(void *ptr, size_t size);
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static void operator delete(void *, MEM_ROOT *){}
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};
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int mysql_open_cursor(THD *thd, select_result *result,
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Server_side_cursor **res);
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#endif /* _sql_cusor_h_ */
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