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81 lines
2.6 KiB
81 lines
2.6 KiB
5 months ago
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#ifndef SQL_TRUNCATE_INCLUDED
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#define SQL_TRUNCATE_INCLUDED
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/* Copyright (c) 2010, 2019, 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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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 02110-1301 USA */
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#include <memory>
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#include <string>
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#include "my_sqlcommand.h"
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#include "sql/dd/types/table.h"
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#include "sql/sql_cmd.h"
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class MDL_ticket;
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class THD;
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struct TABLE_LIST;
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struct handlerton;
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using Up_table = std::unique_ptr<dd::Table>;
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/**
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Sql_cmd_truncate_table represents the TRUNCATE statement.
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*/
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class Sql_cmd_truncate_table : public Sql_cmd {
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/** Set if a lock must be downgraded after truncate is done. */
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MDL_ticket *m_ticket_downgrade = nullptr;
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/** Track error status from functions called. */
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bool m_error = true;
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public:
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/**
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Constructor, used to represent a TRUNCATE statement.
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*/
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Sql_cmd_truncate_table() {}
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virtual ~Sql_cmd_truncate_table() {}
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bool execute(THD *);
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virtual enum_sql_command sql_command_code() const { return SQLCOM_TRUNCATE; }
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private:
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/* Handle locking a base table for truncate. */
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bool lock_table(THD *, TABLE_LIST *);
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/*
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Optimized delete of all rows by doing a full regenerate of the table.
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Depending on the storage engine, it can be accomplished through a
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drop and recreate or via the handler truncate method.
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*/
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void truncate_base(THD *, TABLE_LIST *);
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void truncate_temporary(THD *, TABLE_LIST *);
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void end_transaction(THD *, bool, bool);
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void cleanup_base(THD *, const handlerton *);
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void cleanup_temporary(THD *, handlerton *, const TABLE_LIST &, Up_table *,
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const std::string &);
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};
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#endif
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