Question

I have some stored procedures and a trigger that work great in MySQL 5.5.8 but for some reason don’t work in 5.1. The error descriptions aren’t enough for me to figure out the problem. Here is the code and the errors.

CREATE PROCEDURE `cg_getMatchingContent`( 
MatchTerm VARCHAR(255),
MaxResults INT)
BEGIN
SELECT * FROM (
    SELECT t.*, INSTR(t.`Title`,MatchTerm) as Pos 
    FROM cg_content t ) c
WHERE Pos>0 ORDER BY Pos LIMIT 0, MaxResults;

END 

Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘MaxResults’ at line 8

DELIMITER ;;
CREATE TRIGGER `cg`.`cg_content_UrlDup_ConstTrig`
BEFORE INSERT ON `cg`.`cg_content`
FOR EACH ROW
Begin
DECLARE errorString VARCHAR(500);
DECLARE insert_error CONDITION FOR SQLSTATE '99001';      

IF new.Url = '' THEN
        SET errorString = CONCAT('Url cannot be blank
Title: ' , new.Title);  
     SIGNAL insert_error
        SET MESSAGE_TEXT=errorString; 
END if;

IF Exists(SELECT id FROM cg.cg_content WHERE Url=new.Url) THEN
     SET errorString = CONCAT('Url is not unique
Title: ' , new.Title  , '
Url: ' + new.Url);
     SIGNAL insert_error
        SET MESSAGE_TEXT=errorString;

End if;
End ;;

Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘insert_error
SET MESSAGE_TEXT=errorString;END if;IF ‘ at line 10

Answer 1

The second one is easy to figure, hard to fix. SIGNAL and RESIGNAL commands were introduced in MySQL 5.5. You can’t convert it easily to 5.1. One way to do it, would be to run a query that errors. For example a SELECT from a non-existent table.