更新MySQL使用VB.NET

Question

我正在使用VB.NET与MySQL数据库。我想要更新此代码，以在ONE SQL中完成，而不是在三次。任何人都知道吗？

下面是我使用的代码，工作正常，但有多条线路的速度太慢......

If count3 = "1" Then 

    Dim myCommand As New MySqlCommand 
    Dim myAdapter As New MySqlDataAdapter 
    Dim SQL As String 
    myCommand.Connection = conn 
    myAdapter.SelectCommand = myCommand 
    SQL = "UPDATE employees SET emprole1 = '" & val2 & "' WHERE emprole1 = '" & val1 & "'" 
    myCommand.CommandText = SQL 
    myCommand.ExecuteNonQuery() 
    SQL = "UPDATE employees SET emprole2 = '" & val3 & "' WHERE emprole2 = '" & val2 & "'" 
    myCommand.CommandText = SQL 
    myCommand.ExecuteNonQuery() 
    SQL = "UPDATE employees SET emprole3 = '" & val4 & "' WHERE emprole3 = '" & val3 & "'" 
    myCommand.CommandText = SQL 
    myCommand.ExecuteNonQuery() 

End If 

Answer 1

这只是我的猜测，但你可以尝试胶合所有三个SQL语句一起;非常像

SQL = "update employees set ... ; update employees set ... ;"; 

请注意分隔语句的分号。