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91 lines
3.5 KiB
SQL
91 lines
3.5 KiB
SQL
-- Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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--
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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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--
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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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--
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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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DROP FUNCTION IF EXISTS list_drop;
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DELIMITER $$
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CREATE DEFINER='mariadb.sys'@'localhost' FUNCTION list_drop (
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in_list TEXT,
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in_drop_value TEXT
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)
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RETURNS TEXT
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COMMENT '
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Description
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-----------
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Takes a list, and a value to attempt to remove from the list, and returns the resulting list.
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Useful for altering certain session variables, like sql_mode or optimizer_switch for instance.
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Parameters
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-----------
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in_list (TEXT):
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The comma separated list to drop a value from
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in_drop_value (TEXT):
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The value to drop from the input list
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Returns
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-----------
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TEXT
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Example
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--------
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mysql> select @@sql_mode;
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+-----------------------------------------------------------------------------------------------+
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| @@sql_mode |
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+-----------------------------------------------------------------------------------------------+
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| ANSI_QUOTES,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
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+-----------------------------------------------------------------------------------------------+
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1 row in set (0.00 sec)
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mysql> set sql_mode = sys.list_drop(@@sql_mode, ''ONLY_FULL_GROUP_BY'');
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Query OK, 0 rows affected (0.03 sec)
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mysql> select @@sql_mode;
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+----------------------------------------------------------------------------+
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| @@sql_mode |
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+----------------------------------------------------------------------------+
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| ANSI_QUOTES,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
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+----------------------------------------------------------------------------+
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1 row in set (0.00 sec)
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'
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SQL SECURITY INVOKER
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DETERMINISTIC
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CONTAINS SQL
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BEGIN
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IF (in_drop_value IS NULL) THEN
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SIGNAL SQLSTATE '02200'
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SET MESSAGE_TEXT = 'Function sys.list_drop: in_drop_value input variable should not be NULL',
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MYSQL_ERRNO = 1138;
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END IF;
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IF (in_list IS NULL OR LENGTH(in_list) = 0) THEN
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-- return the list as it was passed in
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RETURN in_list;
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END IF;
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-- ensure that leading / trailing commas are remove, support values with either spaces or not between commas
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RETURN (SELECT TRIM(BOTH ',' FROM REPLACE(REPLACE(CONCAT(',', in_list), CONCAT(',', in_drop_value), ''), CONCAT(', ', in_drop_value), '')));
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END$$
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DELIMITER ;
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