插入/更新mysql記錄查詢錯誤

Question

我有一個查詢來更新數據，如果它存在或插入新記錄。查詢也運行在for循環中：

$pname = $c_info['name']; 
    $cname = $model[$c_id]['name']; 

$iqs =" IF EXISTS (SELECT * FROM custom_question_details WHERE Quiz_id 
=$data[$i] and User_id=$user_id and Parent_Category='$pname' and 
Category_Name='$cname' and Score=$temp)  
UPDATE custom_question_details SET Quiz_id =$data[$i],User_id=$user_id, 
Parent_Category='$pname', Category_Name='$cname',Score=$temp 
ELSE 
insert into custom_question_details (User_id,Quiz_id,Parent_Category,Category_Name,Score) 
values (".$user_id.",".$data[$i].",'".$c_info['name']."','".$model[$c_id]['name']."','".$temp."')"; 

echo "<br>".$iqs; 

我通過在PHP腳本中執行某些計算來獲取變量值。

這些查詢有些錯誤。在回顯上述sql查詢時，也會打印此數據。

IF EXISTS (
SELECT * 
FROM custom_question_details 
WHERE Quiz_id =7 
AND User_id =3 
AND Parent_Category = 'Default for System' 
AND Category_Name = 'sample quiz question 1' 
)UPDATE custom_question_details SET Quiz_id =7,User_id=3,Parent_Category='Default for System',Category_Name='sample quiz question 1',Score='100' 

ELSE insert into custom_question_details (User_id,Quiz_id,Parent_Category,Category_Name,Score) values(3,7,'Default for System','sample quiz question 1','100') 

爲什麼我的查詢錯誤？我甚至嘗試過：

SELECT EXISTS (
SELECT * 
FROM custom_question_details 
WHERE Quiz_id =7 
AND User_id =3 
AND Parent_Category = 'Default for System' 
AND Category_Name = 'sample quiz question 1' 
)UPDATE custom_question_details SET Quiz_id =7,User_id=3, 
Parent_Category='Default for System',Category_Name='sample quiz question 1',Score='100' 
ELSE 
insert into custom_question_details  (User_id,Quiz_id,Parent_Category,Category_Name,Score) values(3,7,'Default for System','sample quiz question 1','100') 

...但它仍然不起作用。我哪裏出錯了？

Answer 1

首先，IF條件的語法是這樣的：

IF EXISTS ([condition]) THEN [your code] ELSE [some other code] 

其次，我認爲你缺少的更新方法的一些括號。 第三，我不確定您是否可以在IF條件下使用多於一列。我需要再多研究一下。

也許你可以告訴我們你收到的確切錯誤？！

希望它能幫助， 丹尼斯Rendler