From a175314c3e5827eb193872241446f2f8f5c9d33c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 20:07:14 +0200 Subject: Adding upstream version 1:10.5.12. Signed-off-by: Daniel Baumann --- sql/sql_truncate.h | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 sql/sql_truncate.h (limited to 'sql/sql_truncate.h') diff --git a/sql/sql_truncate.h b/sql/sql_truncate.h new file mode 100644 index 00000000..7d2ff4b6 --- /dev/null +++ b/sql/sql_truncate.h @@ -0,0 +1,73 @@ +#ifndef SQL_TRUNCATE_INCLUDED +#define SQL_TRUNCATE_INCLUDED +/* Copyright (c) 2010, 2014, 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 */ + +class THD; +struct TABLE_LIST; + +/** + Sql_cmd_truncate_table represents the TRUNCATE statement. +*/ +class Sql_cmd_truncate_table : public Sql_cmd +{ +private: + /* Set if a lock must be downgraded after truncate is done. */ + MDL_ticket *m_ticket_downgrade; + +public: + /** + Constructor, used to represent a TRUNCATE statement. + */ + Sql_cmd_truncate_table() + {} + + virtual ~Sql_cmd_truncate_table() + {} + + /** + Execute a TRUNCATE statement at runtime. + @param thd the current thread. + @return false on success. + */ + bool execute(THD *thd); + + virtual enum_sql_command sql_command_code() const + { + return SQLCOM_TRUNCATE; + } + +protected: + enum truncate_result{ + TRUNCATE_OK=0, + TRUNCATE_FAILED_BUT_BINLOG, + TRUNCATE_FAILED_SKIP_BINLOG + }; + + /** Handle locking a base table for truncate. */ + bool lock_table(THD *, TABLE_LIST *, bool *); + + /** Truncate table via the handler method. */ + enum truncate_result handler_truncate(THD *, TABLE_LIST *, bool); + + /** + Optimized delete of all rows by doing a full regenerate of the table. + Depending on the storage engine, it can be accomplished through a + drop and recreate or via the handler truncate method. + */ + bool truncate_table(THD *, TABLE_LIST *); +}; + +#endif -- cgit v1.2.3