How to throw an error in MySql procedure?

Question

What is the mechanism to force the MySQL to throw an error within the stored procedure?

I have a procedure which call s another function:

PREPARE my_cmd FROM @jobcommand;
EXECUTE my_cmd;
DEALLOCATE PREPARE my_cmd;

the job command is:

jobq.exec("Select 1;wfdlk# to simulatte an error");

then:

CREATE PROCEDURE jobq.`exec`(jobID VARCHAR(128),cmd TEXT)
BEGIN
DECLARE result INT DEFAULT 0;  
SELECT sys_exec( CONCAT('echo ',cmd,' |  base64 -d > ', '/tmp/jobq.',jobID,'.sh ; bash /tmp/jobq.',jobID,'.sh &> /tmp/jobq.',jobID)) INTO result; 
IF result>0 THEN 
# call raise_mysql_error(result); 
END IF;
END;

My jobq.exec is always succeeding. Are there way to rise an error? How to implement raise_mysql_error function??

I am using MySQL 5.5.8

related : http://stackoverflow.com/questions/465727/raise-error-within-mysql-function — Haim Evgi, Feb 01 '11 at 13:09
also read this chapter http://www.docstoc.com/docs/687360/Error-Handling-In-Stored-Procedure — Haim Evgi, Feb 01 '11 at 13:11

score 9 · Accepted Answer · edited Sep 02 '14 at 16:52

9

Yes, there is: use the SIGNAL keyword.

edited Sep 02 '14 at 16:52

Air

8,274
2
53
88

answered Feb 01 '11 at 13:20

Halasy

116
1

3

Thank you! DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET err= 1 exactly that what I need!!! – Arman Feb 02 '11 at 11:11

score 7 · Answer 2 · answered May 20 '13 at 07:18

You may use following stored procedure to emulate error-throwing:

CREATE PROCEDURE `raise`(`errno` BIGINT UNSIGNED, `message` VARCHAR(256))
BEGIN
SIGNAL SQLSTATE
    'ERR0R'
SET
    MESSAGE_TEXT = `message`,
    MYSQL_ERRNO = `errno`;
END

Example:

CALL `raise`(1356, 'My Error Message');

How to throw an error in MySql procedure?

2 Answers2

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