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利用DataTable将其作为参数传给SP

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一,回顾
        上一部分讲述了“在T-SQL中创建和使用TVP”,通过T-SQL建立如下的对象:    
        1)Tables    
          dbo.OrderItem    
          dbo.OrderDetail    
        2) User-Defined Table Types    
            dbo.OrderDetail$Udt    
            dbo.OrderItem$Udt    
        3) Stored Procedures    
            dbo.OrderItem$Insert    
二,在ADO.NET中利用DataTable对象,将其作为参数传给存贮过程    
  相信大家对DataTable的利用已经非常熟悉了,在此主要以Sample为主。    
  ***这次的Sample数据,还是利用上一部分已有的对象,完成DataTable传输数据的操作。    
  主要包含两部分的内容:    
  1)DataTable的数据传输给Stored Procedure    
  2)利用DataTable的TVP数据,可以参与别的实体数据读写(DataReader)。    
  具体实例如下:

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private void btnDataTable_Click(object sender, EventArgs e)      {          //---OrderItem          DataTable dtOrderItem = new DataTable();          dtOrderItem.Columns.Add("OrderId", typeof(int));          dtOrderItem.Columns.Add("CustomerId", typeof(int));          dtOrderItem.Columns.Add("OrderAt", typeof(DateTime));          //---OrderDetail          DataTable dtOrderDetail = new DataTable();          dtOrderDetail.Columns.Add("OrderId", typeof(int));          dtOrderDetail.Columns.Add("LineNumber", typeof(int));          dtOrderDetail.Columns.Add("ProductId", typeof(int));          dtOrderDetail.Columns.Add("Quantity", typeof(int));          dtOrderDetail.Columns.Add("Price", typeof(decimal));          //---Add data          dtOrderItem.Rows.Add(new object[] { 1001, 5001, DateTime.Now });          dtOrderDetail.Rows.Add(new object[] { 1001, 1, 101, 15, 12.28 });          dtOrderDetail.Rows.Add(new object[] { 1001, 2, 102, 20, 102.12 });          dtOrderDetail.Rows.Add(new object[] { 1001, 3, 103, 23, 0.85 });          dtOrderItem.Rows.Add(new object[] { 2001, 6001, DateTime.Now });          dtOrderDetail.Rows.Add(new object[] { 2001, 1, 201, 5, 79.59 });          dtOrderDetail.Rows.Add(new object[] { 2001, 2, 202, 200, 3.25 });          //----          using (SqlConnection conn = new SqlConnection("Data Source=;Initial Catalog=AdventureWorks;UserID=sa;Password="))          {              conn.Open();              //---Passing a Table-Valued Parameter to a Stored Pcocedure              using (SqlCommand cmd = new SqlCommand("dbo.OrderItem$Insert", conn))              {                  cmd.CommandType = CommandType.StoredProcedure;                  //---注意:下边的两个参数名,要和SP的参数名一致。                  SqlParameter tvpOrderItem = cmd.Parameters.AddWithValue("@OrderHeaders", dtOrderItem);                  SqlParameter tvpOrderDetail = cmd.Parameters.AddWithValue("@OrderDetails", dtOrderDetail);                  tvpOrderItem.SqlDbType = SqlDbType.Structured;                  tvpOrderDetail.SqlDbType = SqlDbType.Structured;                  cmd.ExecuteNonQuery();              }              //---Streadming rows with a dataReader              string sql= @"select tvp1.OrderId, tvp1.CustomerId, tvp2.LineNumber, tvp2.ProductId                          from    dbo.OrderItem as tvp1 INNER JOIN @tvpDetail as tvp2 ON tvp1.OrderId=tvp2.OrderId                          order by tvp2.OrderId, tvp2.LineNumber;";              SqlCommand readCommand = new SqlCommand(sql, conn);              readCommand.CommandType = CommandType.Text;              SqlParameter tvpDetail = readCommand.Parameters.AddWithValue("@tvpDetail", dtOrderDetail);              tvpDetail.SqlDbType = SqlDbType.Structured;              tvpDetail.TypeName = "dbo.OrderDetail$Udt";              SqlDataReader reader = readCommand.ExecuteReader();              while (reader.Read())              {                  Console.WriteLine(string.Format("OrderId={0}, CustomrId={1}, LineNumber={2}, ProductId={3}",                                      reader.GetInt32(0), reader.GetInt32(1), reader.GetInt32(2), reader.GetInt32(3)));              }              reader.Close();              //读出结果如下:              //-----------------------              //OrderId=1001, CustomrId=5001, LineNumber=1, ProductId=101              //OrderId=1001, CustomrId=5001, LineNumber=2, ProductId=102              //OrderId=1001, CustomrId=5001, LineNumber=3, ProductId=103              //OrderId=2001, CustomrId=6001, LineNumber=1, ProductId=201              //OrderId=2001, CustomrId=6001, LineNumber=2, ProductId=202              //-----------------------              conn.Close();          }      }


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