will IF SIGNAL SQLSTATE in mariadb exit stored procedure? - stored-procedures

Question

I don't quite understand how MariaDB signals work.
I have a stored procedure that takes a string as input. I am testing that string for valid characters. If invalid characters are found then I want to send a signal that the error was invalid. Will a stored procedure immediately exit if a SIGNAL SQLSTATE '......' SET MESAGE_TEXT='......' is raised? Or will it complete the procedure before issuing the signal?

Answer 1

When just using IF...THEN statements it does not seem to work.
CREATE PROCEDURE `testP`()
BEGIN
IF testStringSecurity('he;llo world') != 0 THEN
SELECT 'INVALID CHARACTERS';
END IF;
SELECT 'GOOD TO GO';
END;
Always returns GOOD TO GO. It seems that you must wrap in IF ... THEN ... ELSE like so to get a valid case. Though setting a signal is different.
CREATE PROCEDURE `testP`()
BEGIN
IF testStringSecurity('he;llo') != 0 THEN
SELECT 'INVALID CHARACTERS';
ELSE
SELECT 'GOOD TO GO';
END IF;
END
Using a SIGNAL does seem to interrupt execution immediately.
CREATE PROCEDURE `testP`()
BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
GET DIAGNOSTICS CONDITION 1 #sqlstate = RETURNED_SQLSTATE,
#errno = MYSQL_ERRNO, #text = MESSAGE_TEXT;
SET #full_error = CONCAT("ERROR ", #errno, " (", #sqlstate, "): ", #text);
SELECT #full_error;
END;
DECLARE EXIT HANDLER FOR NOT FOUND
BEGIN
SELECT CONCAT('ERROR: ',#str,' RETRUNED NOT FOUND EXCEPTION.');
END;
IF testStringSecurity('he;llo') != 0 THEN
SIGNAL SQLSTATE '42000'
SET MESSAGE_TEXT = 'ERROR: Invalid string';
END IF;
SELECT 'GOOD TO GO';
END
Returns 'ERROR 1644 (42000): ERROR: Invalid string'