DROP PROCEDURE [IF EXISTS] sp_name
This statement is used to drop a stored procedure. That is, the specified routine is removed from the server along with all privileges specific to the procedure. You must have the ALTER ROUTINE
privilege for the routine. If the automatic_sp_privileges
server system variable is set, that privilege and EXECUTE
are granted automatically to the routine creator - see Stored Routine Privileges.
The IF EXISTS
clause is a MySQL/MariaDB extension. It prevents an error from occurring if the procedure or function does not exist. A NOTE
is produced that can be viewed with SHOW WARNINGS
.
While this statement takes effect immediately, threads which are executing a procedure can continue execution.
DROP PROCEDURE simpleproc;
IF EXISTS:
DROP PROCEDURE simpleproc; ERROR 1305 (42000): PROCEDURE test.simpleproc does not exist DROP PROCEDURE IF EXISTS simpleproc; Query OK, 0 rows affected, 1 warning (0.00 sec) SHOW WARNINGS; +-------+------+------------------------------------------+ | Level | Code | Message | +-------+------+------------------------------------------+ | Note | 1305 | PROCEDURE test.simpleproc does not exist | +-------+------+------------------------------------------+
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https://mariadb.com/kb/en/drop-procedure/