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Edit File : sql_cursor.h \| Size : 2.26 KB
/* 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_ */ Back

Edit File : sql_cursor.h | Size : 2.26 KB

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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