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70 lines
2 KiB
C++
70 lines
2 KiB
C++
#ifndef SQL_TRUNCATE_INCLUDED
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#define SQL_TRUNCATE_INCLUDED
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/* Copyright (c) 2010, 2014, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 02110-1335 USA */
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class THD;
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struct TABLE_LIST;
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/**
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Truncate_statement represents the TRUNCATE statement.
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*/
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class Truncate_statement : public Sql_statement
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{
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private:
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/* Set if a lock must be downgraded after truncate is done. */
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MDL_ticket *m_ticket_downgrade;
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public:
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/**
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Constructor, used to represent a ALTER TABLE statement.
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@param lex the LEX structure for this statement.
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*/
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Truncate_statement(LEX *lex)
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: Sql_statement(lex)
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{}
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virtual ~Truncate_statement()
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{}
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/**
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Execute a TRUNCATE statement at runtime.
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@param thd the current thread.
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@return false on success.
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*/
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bool execute(THD *thd);
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protected:
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enum truncate_result{
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TRUNCATE_OK=0,
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TRUNCATE_FAILED_BUT_BINLOG,
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TRUNCATE_FAILED_SKIP_BINLOG
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};
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/** Handle locking a base table for truncate. */
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bool lock_table(THD *, TABLE_LIST *, bool *);
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/** Truncate table via the handler method. */
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enum truncate_result handler_truncate(THD *, TABLE_LIST *, bool);
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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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bool truncate_table(THD *, TABLE_LIST *);
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};
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#endif
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