Table-values parameter(TVP)系列之二: 利用DataTable将其作为参数传给SP

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();           }       }

三，参照文献 
  MSDN：Table-Valued Parameters in SQL Server 2008 (ADO.NET)
  URL: ms-help://MS.MSDNQTR.v90.en/wd_adonet/html/370c16d5-db7b-43e3-945b-ccaab35b739b.htm