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/* Copyright (c) 2006, 2010, 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_UPDATE_INCLUDED
#define SQL_UPDATE_INCLUDED
#include "sql_class.h" /* enum_duplicates */
#include "sql_cmd.h" // Sql_cmd_dml
#include "sql_base.h"
class Item;
struct TABLE_LIST;
class THD;
typedef class st_select_lex SELECT_LEX;
typedef class st_select_lex_unit SELECT_LEX_UNIT;
bool check_unique_table(THD *thd, TABLE_LIST *table_list);
bool records_are_comparable(const TABLE *table);
bool compare_record(const TABLE *table);
class Sql_cmd_update final : public Sql_cmd_dml
{
public:
Sql_cmd_update(bool multitable_arg)
: multitable(multitable_arg)
{ }
enum_sql_command sql_command_code() const override
{
return multitable ? SQLCOM_UPDATE_MULTI : SQLCOM_UPDATE;
}
DML_prelocking_strategy *get_dml_prelocking_strategy()
{
return &multiupdate_prelocking_strategy;
}
protected:
bool precheck(THD *thd) override;
bool prepare_inner(THD *thd) override;
bool execute_inner(THD *thd) override;
private:
bool update_single_table(THD *thd);
bool multitable;
DML_prelocking_strategy dml_prelocking_strategy;
Multiupdate_prelocking_strategy multiupdate_prelocking_strategy;
public:
List<Item> *update_value_list;
};
#endif /* SQL_UPDATE_INCLUDED */
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