String connStr = "server='" + SeverName + "';Database='" + DBName + "';uid='" + UserName + "';pwd='"  + UserPW + "'";
        string sql="select * from t_a";
        DataSet dt = new DataSet("t_a");//创建一个数据集dt
        MySqlConnection Conn = new MySqlConnection(connStr);//定义新的数据连接控件并初始化
        Conn.Open();//打开连接
        MySqlDataAdapter reads = new MySqlDataAdapter(sql, Conn);//定义并初始化数据适配器

        MySqlCommandBuilder cmb = new MySqlCommandBuilder(reads);

        reads.MissingSchemaAction = MissingSchemaAction.AddWithKey;
        reads.Fill(dt, "t_a");    //将数据适配器中的数据填充到数据集dt中

        FileStream fs = new FileStream(@"E:\My Pictures\test.bmp", FileMode.OpenOrCreate, FileAccess.Read);

        byte[] MyData = new byte[fs.Length];
        fs.Read(MyData, 0, System.Convert.ToInt32(fs.Length));

        fs.Close();

        DataRow myRow;
        myRow = dt.Tables["t_a"].NewRow();

       
        myRow["image"] = MyData;

        dt.Tables["t_a"].Rows.Add(myRow);

        reads.Update(dt, "t_a");

        Conn.Close();//关闭连接

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