SQL语句中的output用法

 private void button2_Click(object sender, RoutedEventArgs e)
         {
             using (SqlConnection conn = new SqlConnection("Data Source=XX;Initial Catalog=DBData;User ID=sa;Password=111111"))
             {
                 conn.Open();
 
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = "insert [DBData].[dbo].[T_Student] (Number,Name,Score) output inserted.ID values('012345','LiLei','89')";
                     long id = (long)cmd.ExecuteScalar(); //ExecuteScalar()：执行查询，返回结果集中的第一行的第                                                                                                              一列
                     MessageBox.Show("操作成功: i=" + id.ToString());
                 }
             }
 
         }
 
 private void button2_Click(object sender, RoutedEventArgs e)
         {
             using (SqlConnection conn = new SqlConnection("Data Source=XX;Initial Catalog=DBData;User ID=sa;Password=111111"))
             {
                 conn.Open();
 
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = "Select * from [DBData].[dbo].[T_Student] where score<160";
                     using (SqlDataReader reader = cmd.ExecuteReader())
                     {
                         while (reader.Read())
                         {
                             MessageBox.Show(reader.GetString());  //获取指定列的字符串的值
                         }
                     }
                 }
             }
 
         }
 
 private void button2_Click(object sender, RoutedEventArgs e)
         {
             using (SqlConnection conn = new SqlConnection("Data Source=XX;Initial Catalog=DBData;User ID=sa;Password=111111"))
             {
                 conn.Open();
                 using (SqlCommand cmd = conn.CreateCommand())
                 {
                     cmd.CommandText = "select * from [DBData].[dbo].[T_Student] where Score<@Score";
                     cmd.Parameters.Add(new SqlParameter("@Score", ));
 
                     DataSet dataset = new DataSet();
 
                     //SqlDataAdapter是一个帮我们把SqlCommand查询结果填充到DataSet中的类
                     SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                     adapter.Fill(dataset);
 
                     DataTable dt = dataset.Tables[];
                 }
             }
 
             MessageBox.Show("操作成功");
 
         }