MySQL錯誤從PHP查詢：IF EXISTS

Question

我有這個PHP代碼查詢到MySQL數據庫：

$query2 = "IF(EXISTS (SELECT * FROM shipcargo WHERE shipid='$shipid' AND item='$item' AND price='$price')) 
    BEGIN 
    UPDATE shipcargo SET amount = amount+'$amount' WHERE shipid='$shipid' AND item='$item' AND price='$price' 
    END 
    ELSE 
    BEGIN 
    INSERT INTO shipcargo (shipid, item, amount, price) VALUES('$shipid', '$item', '$amount', '$price') 
    END"; 
    mysql_query($query2) or die(mysql_error()); 

返回的錯誤是：

您的SQL語法錯誤; （EXISTS（SELECT * FROM shipcargo WHERE shipid = '11'AND item ='WheatBastard'AN'at line 1）

Answer 1

語法wron G！看看http://dev.mysql.com/doc/refman/5.0/en/exists-and-not-exists-subqueries.html

Answer 2

我在使用附近的IF語句相信這是

IF EXISTS (SELECT * FROM 

不是

IF (EXISTS (SELECT 

你並不需要一個支架與IF語句