Question

我有files表

(userID, fileID, fileName, folderID, folderName).

我想为找到重复项的用户更新多行，例如

目前，我userID=1 2 files folderName 'work'和folderID of '1'下的'work1'

我想将folderName更新为folderID of '1'，但保持相同UPDATE files SET fileFolder = '$folderName' WHERE folderID = '$folderID' AND userID = '$userID'。

这是我当前的sql语句，我无法让它工作：

{{1}}

Answer 1

UPDATE files SET fileFolder = '$folderName'  
WHERE folderID = '$folderID' AND userID = '$userID'

而不是设置fileFolder，你尝试使用folderName吗？比如..

UPDATE files SET folderName= '$folderName'  
WHERE folderID = '$folderID' AND userID = '$userID'

Answer 2

如果工作文件夹有多次，你需要更新文件夹名称，例如work to work1。所以你需要检查旧文件夹是否有多次。

尝试这样的事情（未经测试）：

  UPDATE files SET folderName= '$folderName'  
    WHERE folderID = '$folderID' AND userID = '$userID' AND ( 1 < (SELECT count(*) from files where folderID = $folderID and folderName='oldFolderName'))

mySQL使用相同的值更新多行

2 个答案: