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/* Copyright (c) 2005, 2011, 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 as published by the Free Software Foundation; version 2 of the License. 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 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 02110-1335 USA */ #ifndef _sql_cursor_h_ #define _sql_cursor_h_ #ifdef USE_PRAGMA_INTERFACE #pragma interface /* gcc class interface */ #endif #include "sql_class.h" /* Query_arena */ class JOIN; /** @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 { protected: /** Row destination used for fetch */ select_result *result; public: Server_side_cursor(MEM_ROOT *mem_root_arg, select_result *result_arg) :Query_arena(mem_root_arg, STMT_INITIALIZED), result(result_arg) {} virtual bool is_open() const= 0; virtual int open(JOIN *top_level_join)= 0; virtual void fetch(ulong num_rows)= 0; virtual void close()= 0; virtual bool export_structure(THD *thd, Row_definition_list *defs) { DBUG_ASSERT(0); return true; } virtual ~Server_side_cursor(); static void *operator new(size_t size, MEM_ROOT *mem_root) { return alloc_root(mem_root, size); } static void operator delete(void *ptr, size_t size); static void operator delete(void *, MEM_ROOT *){} }; int mysql_open_cursor(THD *thd, select_result *result, Server_side_cursor **res); #endif /* _sql_cusor_h_ */
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