一、回顧

上一部分講述了“在T-SQL中創(chuàng)建和使用TVP”，通過T-SQL建立如下的對象：

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對象，將其作為參數(shù)傳給存貯過程

相信大家對DataTable的利用已經(jīng)非常熟悉了，在此主要以Sample為主。

這次的Sample數(shù)據(jù)，還是利用上一部分已有的對象，完成DataTable傳輸數(shù)據(jù)的操作。

主要包含兩部分的內(nèi)容：

1）DataTable的數(shù)據(jù)傳輸給Stored Procedure

2）利用DataTable的TVP數(shù)據(jù)，可以參與別的實(shí)體數(shù)據(jù)讀寫(DataReader)。

具體實(shí)例如下：

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：下邊的兩個(gè)參數(shù)名，要和SP的參數(shù)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();

//讀出結(jié)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();

}

}