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61 lines
2.2 KiB
61 lines
2.2 KiB
create
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definer = `mysql.sys`@localhost function sys.list_drop(in_list text, in_drop_value text) returns text 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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' deterministic sql security invoker
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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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