Question

我有一个查询来更新数据（如果存在）或插入新记录。该查询也在for循环中运行：

  $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;

我通过在PHP脚本中执行某些计算来获取变量值。

这些是查询的一些错误。在回显上面的sql查询时，也会打印这些数据。

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')

为什么我的查询错了？我甚至尝试过：

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')

......但它仍然无效。我哪里错了？

Answer 1

首先，IF条件语法是这样的：

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

其次，我认为你缺少UPDATE方法的一些括号。第三，我不确定你是否可以在IF条件下使用多个列。我需要多研究一下。

也许您可以告诉我们您收到的确切错误？！

希望它有所帮助，丹尼斯雷德勒

插入/更新mysql记录查询错误

1 个答案: