Question

我试图让我的DataAdapter从另一个数据库（相同的表但不同的值）更新/插入我的表的新值它应该只复制DB1中的值并在DB2中插入/更新它们。我没有编译错误，DataTables似乎有正确的值。但没有任何内容得到更新或插入。

所以它应该从我的数据库（DB1）填充数据表（dataTable1），然后设置要修改的所有行并将它们插入DB2 但是，它不会起作用。

    DataTable dataTable1 = new DataTable("counters");
    string command = "SELECT * FROM counters;"; // same layout and name on both tables

    using (MySqlConnection connectionFrom = new MySqlConnection(constringfrom)) // DB1
    {
        MySqlDataAdapter dataAdapter1 = new MySqlDataAdapter(command, connectionFrom);
        dataAdapter1.Fill(dataTable1);
    } 

    using (MySqlConnection ConnectionTo = new MySqlConnection(constringto)) // DB2
    {
        MySqlDataAdapter dataAdapter2 = new MySqlDataAdapter(command, ConnectionTo);
        MySqlCommandBuilder cmb2 = new MySqlCommandBuilder(dataAdapter2);
        dataAdapter2.UpdateCommand = cmb2.GetUpdateCommand();
        dataAdapter2.InsertCommand = cmb2.GetInsertCommand();
        foreach (DataRow r in dataTable1.Rows)
        {
            r.SetModified(); // just for testing purposes..
        }

        dataAdapter2.Update(dataTable1); // Correct values but no update to the DB :(
    }

    Console.WriteLine("Updating..... DONE"); // well... no

C＃DataAdapter似乎无法更新我的MySQL表

0 个答案: