dd_view.h

Go to the documentation of this file.

/* Copyright (c) 2015, 2017, 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 DD_VIEW_INCLUDED
#define DD_VIEW_INCLUDED
 
struct MEM_ROOT;
class THD;
struct TABLE_LIST;
 
namespace dd {
class Schema;
class View;
 
/**
  Store view metadata in the data-dictionary.
 
  @param   thd                Thread handle.
  @param   schema             Schema where the view should be created.
  @param   view               TABLE_LIST element describing the view.
 
  @note The caller must rollback both statement and transaction on failure,
        before any further accesses to DD. This is because such a failure
        might be caused by a deadlock, which requires rollback before any
        other operations on SE (including reads using attachable transactions)
        can be done.
 
  @retval  false        On Success.
  @retval  true         On Failure.
*/
bool create_view(THD *thd, const dd::Schema &schema, TABLE_LIST *view);
 
/**
  Update view metadata in dd.views.
 
  @param thd                Thread handle.
  @param new_view           View object that should be updated.
  @param view               TABLE_LIST element describing the new view.
 
  @note The caller must rollback both statement and transaction on failure,
        before any further accesses to DD. This is because such a failure
        might be caused by a deadlock, which requires rollback before any
        other operations on SE (including reads using attachable transactions)
        can be done.
 
  @retval false       On success.
  @retval true        On failure.
*/
bool update_view(THD *thd, dd::View *new_view, TABLE_LIST *view);
 
/** Read view metadata from dd.views into TABLE_LIST */
bool read_view(TABLE_LIST *view, const dd::View &view_ref, MEM_ROOT *mem_root);
 
/**
  Update view status(valid/invalid) value in dd.views.options.
 
  @param   thd          Thread handle.
  @param   schema_name  Schema name.
  @param   view_name    View name.
  @param   status       View status(valid/invalid).
  @param   commit_dd_changes  Indicates whether changes to DD need to be
                              committed.
 
  @note In case when commit_dd_changes is false, the caller must rollback
        both statement and transaction on failure, before any further
        accesses to DD. This is because such a failure might be caused by
        a deadlock, which requires rollback before any other operations on
        SE (including reads using attachable transactions) can be done.
        If case when commit_dd_changes is true this function will handle
        transaction rollback itself.
 
  @retval  false        On Success.
  @retval  true         On Failure.
*/
bool update_view_status(THD *thd, const char *schema_name,
                        const char *view_name, bool status,
                        bool commit_dd_changes);
 
}  // namespace dd
#endif  // DD_VIEW_INCLUDED