How to throw an error in MySql procedure?

http://stackoverflow.com/questions/4862911/how-to-throw-an-error-in-mysql-procedure

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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??

BTW I am using MySQL 5.5.8

thanks Arman.

mysql stored-procedures throw stored-functions

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asked Feb 1 '11 at 13:06 Arman 1,89652952

1

related : stackoverflow.com/questions/465727/… – Haim Evgi Feb 1 '11 at 13:09

also read this chapter docstoc.com/docs/687360/Error-Handling-In-Stored-Procedure – Haim Evgi Feb 1 '11 at 13:11

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2 Answers

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up vote7down voteaccepted

Yes, there is: use the SIGNAL keyword.

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edited Sep 2 '14 at 16:52 Air 3,75212446

answered Feb 1 '11 at 13:20 Halasy 861

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Thank you! DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET err= 1 exactly that what I need!!! – Arman Feb 2 '11 at 11:11

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up vote5down vote

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');