Question

我有两张桌子：

Login有4个属性：

 1. NRIC
 2. NAME
 3. PASSWORD
 4. TYPE (USER / ADMIN)

DETAILS有4个属性：

 1. NRIC
 2. NAME
 3. PASSWORD
 4. EMAIL

如果表LOGIN已更新，我希望表DETAILS更新。

例如，如果表password中的DETAILS已更新，则假设的表LOGIN也应更新。

SQLCmd.CommandText = "UPDATE DETAILS set PASSWORD='" & TextBoxPassword.Text & "',EMAIL='" & TextBoxEmail.Text & "' WHERE NRIC='" & myVar2 & "'"

我如何更新它们？

Answer 1

首先更新详细信息表。然后提交更改。然后更新登录表。交易：D

Answer 2

为此使用SqlTransaction，下面是参考代码：

<强> C＃：

    SqlConnection conn = new SqlConnection("[Your connection string]");
    conn.Open();
    SqlTransaction Trans = conn.BeginTransaction();
    SqlCommand SQLCmd = new SqlCommand("",conn);
    SQLCmd.Transaction = Trans;
    try
    {
        SQLCmd.CommandText = "UPDATE DETAILS set PASSWORD='" & TextBoxPassword.Text & "',EMAIL='" & TextBoxEmail.Text & "' WHERE NRIC='" & myVar2 & "'";
        SQLCmd.ExecuteNonQuery();
        SQLCmd.CommandText = "UPDATE Login  set PASSWORD='" & TextBoxPassword.Text & "' WHERE NRIC='" & myVar2 & "'";
        SQLCmd.ExecuteNonQuery();
        Trans.Commit();

    }
    catch
    {
        Trans.Rollback();
    }
    finally {
        conn.Close();

    }

<强> VB：

Dim conn As New SqlConnection("[Your connection string]")
conn.Open()
Dim Trans As SqlTransaction = conn.BeginTransaction()
Dim SQLCmd As New SqlCommand("", conn)
SQLCmd.Transaction = Trans
Try
  SQLCmd.CommandText = "UPDATE DETAILS set PASSWORD='" And TextBoxPassword.Text And "',EMAIL='" And TextBoxEmail.Text And "' WHERE NRIC='" And myVar2 And "'"
  SQLCmd.ExecuteNonQuery()
  SQLCmd.CommandText = "UPDATE Login  set PASSWORD='" And TextBoxPassword.Text And "' WHERE NRIC='" And myVar2 And "'"
  SQLCmd.ExecuteNonQuery()

  Trans.Commit()
Catch
  Trans.Rollback()
Finally

  conn.Close()
End Try

Answer 3

MySQL = "DECLARE @NumberOfRowsUpdated INT" & vbcrlf
MySQL &= "" & vbcrlf 
MySQL &= "UPDATE details" & vbcrlf 
MySQL &= "SET password = '@password'," & vbcrlf 
MySQL &= "    email = '@email'" & vbcrlf 
MySQL &= "WHERE NRIC = '@nric'" & vbcrlf 
MySQL &= "" & vbcrlf 
MySQL &= "SELECT @NumberOfRowsUpdated = @@ROWCOUNT" & vbcrlf 
MySQL &= "" & vbcrlf 
MySQL &= "IF @NumberOfRowsUpdated > 0" & vbcrlf 
MySQL &= "BEGIN" & vbcrlf 
MySQL &= "    UPDATE LOGIN" & vbcrlf 
MySQL &= "    SET password = '@password'," & vbcrlf 
MySQL &= "        email = '@email'" & vbcrlf 
MySQL &= "    WHERE NRIC = '@nric'" & vbcrlf 
MySQL &= "END" & vbcrlf 

MySQL = MySQL.Replace("@password",TextBoxPassword.Text).Replace("@email", TextBoxEmail.Text).Replace("@nric", myVar2)

SqlCmd.Commandtext = MySQL
SqlCmd.ExecuteNonQuery

已发布答案的人已经提交并回复了＃39;解决方案是错的。那些解决方案并不认为查询实际执行了＃34; UPDATED＆＃34;细节。此解决方案可确保第一个查询实际上是＆＃34;更新＆＃34;在进行第二次查询之前有一行详细信息。

Answer 4

这是比SQL解决方案更多VB的代码：

Dim intTotalRowsUpdated As Integer
SQLCmd.CommandText = "UPDATE DETAILS set PASSWORD='" & TextBoxPassword.Text & "',EMAIL='" & TextBoxEmail.Text & "' WHERE NRIC='" & myVar2 & "'"
intTotalRowsUpdated = SQLCmd.ExecuteNonQuery()
If intTotalRowsUpdated > 0 Then
    SQLCmd.CommandText = "UPDATE login set PASSWORD='" & TextBoxPassword.Text & "',EMAIL='" & TextBoxEmail.Text & "' WHERE NRIC='" & myVar2 & "'"
    SQLCmd.ExecuteNonQuery
End If

Answer 5

您可以使用存储过程来执行此任务。像下面的东西，

CREATE PROC proc_UpdateProcedure    
@PASSWORD VARCHAR(100),     
@NRIC INT    
AS    
DECLARE @Ret INT  

BEGIN TRANSACTION    
 BEGIN TRY  
  -- UPDATE DETAILS TABLE  
  UPDATE DETAILS SET PASSWORD = @PASSWORD WHERE NRIC = @NRIC

  -- UPDATE Login TABLE
  UPDATE Login SET PASSWORD = @PASSWORD WHERE NRIC = @NRIC 

  COMMIT TRANSACTION  
  SET @Ret = 1  
  SELECT @Ret  
 END TRY  
 BEGIN CATCH   
  ROLLBACK TRANSACTION  
  SET @Ret = 0  
  SELECT @Ret  
 END CATCH

Answer 6

如果你真的想要在更新一个表时更新另一个表，你可能需要考虑一个触发器：

create trigger trigUpdateDetails
on details
after update
as
begin
    update login
    set 
        password=ins.password
    from login td
    join inserted ins on td.nric = ins.nric
end

此触发器导致详细信息表的任何更新也更新登录表的密码字段，无论更新源自客户端应用程序还是源自数据库级别的语句。

更多信息：

http://msdn.microsoft.com/en-us/magazine/cc164047.aspx

文章有点陈旧，但文章中的信息仍然相关。

如何在一个查询中更新2表

6 个答案: