MySQL中的存储过程语法错误

Question

I am searching the error for two hours, yet I can't find so far:

CREATE DEFINER=`root`@`localhost` PROCEDURE `insert_diffmod`
     (IN para_diffmod LONGTEXT, 
      IN para_link LONGTEXT)
BEGIN

IF EXIT (
    SELECT website_link FROM diffmod WHERE website_link=para_link
    )THEN 
    DELETE FROM diffmod WHERE website_link=para_link;

ELSE
    INSERT INTO diffmod(website_id,website_link)
    SELECT id,link
    FROM   site_html
    Where  link=para_link;

    UPDATE diffmod
    SET diffmod_content= para_diffmod
    where website_link = para_link;

END IF; 
END

The above stored procedure works as if the link found, it will delete the row! If not, it will add and update the new link.

Answer 1

Change If EXIT to IF EXISTS

CREATE DEFINER=`root`@`localhost` PROCEDURE `insert_diffmod`( 
IN para_diffmod LONGTEXT, 
IN para_link LONGTEXT)
BEGIN

IF EXISTS (
    SELECT website_link FROM diffmod WHERE website_link=para_link
    )THEN 
    DELETE FROM diffmod WHERE website_link=para_link;

ELSE
    INSERT INTO diffmod(website_id,website_link)
    SELECT id,link
    FROM   site_html
    Where  link=para_link;

    UPDATE diffmod
    SET diffmod_content= para_diffmod
    where website_link = para_link;

END IF; 
END