`RESIGNAL` Requires an Active Handler

All forms of RESIGNAL require that a handler be active when it executes. If no handler is active, RESIGNAL is illegal and a resignal when handler not active error occurs. For example:

mysql> CREATE PROCEDURE p () RESIGNAL;
Query OK, 0 rows affected (0.00 sec)
mysql> CALL p();
ERROR 1739 (0K000): RESIGNAL when handler not active

Here is a more difficult example:

delimiter //
CREATE FUNCTION f () RETURNS INT BEGIN
 RESIGNAL;
 RETURN 5;
END//
CREATE PROCEDURE p ()
BEGIN
 DECLARE EXIT HANDLER FOR SQLEXCEPTION SET @a=f();
 SIGNAL SQLSTATE '55555';
END//
delimiter ;
CALL p();

At the time the RESIGNAL executes, there is a handler, even though the RESIGNAL is not defined inside the handler.

A statement such as the one following may appear bizarre because RESIGNAL apparently is not in a handler:

CREATE TRIGGER t_bi BEFORE INSERT ON t FOR EACH ROW RESIGNAL;

But it does not matter. RESIGNAL does not have to be technically "in" (that is, contained in), a handler declaration. The requirement is that a handler must be active.

RESIGNAL Requires an Active Handler

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`RESIGNAL` Requires an Active Handler