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How can we write MySQL handler in a stored procedure?
Whenever an exception occurred in MySQL stored procedure, it is very important to handle it by throwing a proper error message. Suppose, if we do not handle the exception, there would be a chance to fail application with that certain exception in a stored procedure. MySQL provides a handler to handle the exception in the stored procedure. Followings are the four kinds of MySQL handlers which can be used in a stored procedure −
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SELECT 'got an error';
The above handler will throw an error message and continues the execution.
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET got_error=1;
The above handler will set the variable got_error to 1 and continues the execution.
DECLARE EXIT HANDLER FOR SQLEXCEPTION SET got_error=1;
The above handler will set the variable got_error to 1 and terminates the execution.
DECLARE EXIT HANDLER FOR SQLSTATE '23000' SET got_error=1;
The above handler will throw a default MySQL error message and terminates the execution by setting the variable got_error to 1.
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