RELEASE_LOCK( )

This MySQL function releases a lock created by GET_LOCK().

Syntax

Below is the syntax for this command. Text within square brackets (i.e, [ and ] ) are optional. Choices are separated by bars (i.e, | ). Ellipses preceded by a comma indicates a repeating pattern. Ellipses before or after syntax are used to highlight a relevant except from the larger syntax. Text displayed in italic letters represent text that should be replaced with the specific names related to the database (e.g., column with the name of the column).

RELEASE_LOCK(string)

Explanation

This function releases a lock created by GET_LOCK(). The name of the lock is given in parentheses. If successful, 1 is returned; if unsuccessful, 0 is returned. If the lock specified does not exist, NULL is returned.

Examples

SELECT RELEASE_LOCK('my_lock');

+-------------------------+
| RELEASE_LOCK('my_lock') |
+-------------------------+
|                       1 |
+-------------------------+

As an alternative to using SELECT, you can use the DO statement. In this case, no results are returned, but the lock is released.

DO RELEASE_LOCK('my_lock');