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-- Copyright (c) 2015, 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 02110-1301 USA
DROP FUNCTION IF EXISTS list_add;
DELIMITER $$
CREATE DEFINER='mariadb.sys'@'localhost' FUNCTION list_add (
in_list TEXT,
in_add_value TEXT
)
RETURNS TEXT
COMMENT '
Description
-----------
Takes a list, and a value to add to the list, and returns the resulting list.
Useful for altering certain session variables, like sql_mode or optimizer_switch for instance.
Parameters
-----------
in_list (TEXT):
The comma separated list to add a value to
in_add_value (TEXT):
The value to add to the input list
Returns
-----------
TEXT
Example
--------
mysql> select @@sql_mode;
+-----------------------------------------------------------------------------------+
| @@sql_mode |
+-----------------------------------------------------------------------------------+
| ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
+-----------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> set sql_mode = sys.list_add(@@sql_mode, ''ANSI_QUOTES'');
Query OK, 0 rows affected (0.06 sec)
mysql> select @@sql_mode;
+-----------------------------------------------------------------------------------------------+
| @@sql_mode |
+-----------------------------------------------------------------------------------------------+
| ANSI_QUOTES,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
+-----------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
'
SQL SECURITY INVOKER
DETERMINISTIC
CONTAINS SQL
BEGIN
IF (in_add_value IS NULL) THEN
SIGNAL SQLSTATE '02200'
SET MESSAGE_TEXT = 'Function sys.list_add: in_add_value input variable should not be NULL',
MYSQL_ERRNO = 1138;
END IF;
IF (in_list IS NULL OR LENGTH(in_list) = 0) THEN
-- return the new value as a single value list
RETURN in_add_value;
END IF;
RETURN (SELECT CONCAT(TRIM(BOTH ',' FROM TRIM(in_list)), ',', in_add_value));
END$$
DELIMITER ;
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