Question

I created this test procedure :

DELIMITER //  
CREATE PROCEDURE `str` (IN var1 INT)  
BEGIN
    WHILE var1 < 5 DO
        SELECT var1;
        SET var1 = var1 + 1;
    END WHILE;
END //
DELIMITER ;

when I run it via phpmyadmin, nothing happens. no error, no confirm message. If I CALL str(1), I get a message saying the procedure doesn’t exist. What’s wrong here?

Answer 1

If you want to get the iterated value of var1 you need the SELECT outside of the WHILE loop. The following works fine in my MySQL install:

DROP PROCEDURE IF EXISTS `str`;
DELIMITER //  
CREATE PROCEDURE `str` (IN var1 INT)  
BEGIN
    WHILE var1 < 5 DO
        SET var1 = var1 + 1;
    END WHILE;
    SELECT var1;
END //
DELIMITER ;

Executing CALL str(1) returns 5