MySQL中的存儲過程語法錯誤

Question

我正在搜索錯誤兩個小時，但到目前為止找不到：

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

上面的存儲過程就像找到鏈接一樣工作，它將刪除該行！ 如果沒有，它將添加並更新新鏈接。

Answer 1

將“退出”更改為“如果存在”

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