MySql - Stored function syntax error

Question

SQL:

CREATE FUNCTION delete_user (uId INT) RETURNS BOOLEAN
BEGIN
    IF uID >= 0 THEN
        START TRANSACTION;
        DELETE FROM Folder WHERE u_id = uId;
        DELETE FROM `User` WHERE id = uId;
        RETURN 1;
    END IF;
    RETURN 0;
END;

Error:

#1064 - 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 '' at line 4

Where is the syntax error?

Answer 1

You need to put a delimiter around your function

delimiter |
CREATE FUNCTION delete_usr (uId INT) RETURNS BOOLEAN
BEGIN
    IF uID >= 0 THEN        
        DELETE FROM Folder WHERE u_id = uId;
        DELETE FROM `User` WHERE id = uId;
        RETURN 1;
    END IF;
    RETURN 0;
END
|
delimiter ;

The default delimiter is ; . But if you want to create the procedure/function the DB engine would think your statement ends at the first ; . That would lead to an incomplete statement. You can define another delimiter and then use it to mark the end of statements.