.net - 使用 VB.NET 更新 MySQL

Question

我正在使用带有 MySQL 数据库的 VB.NET。我想更新此代码以在一个 SQL 而不是三个 SQL 中完成所有操作。谁知道怎么做？

这是我正在使用的代码，工作正常但多行太慢...

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，但您可以尝试将所有三个 SQL 语句粘合在一起；很像

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

注意分隔语句的分号。