一,回顾
上一部分讲述了“在ADO.NET中利用DataTable对象,将其作为参数传给存贮过程”。
通过DataTable实例,完成了两部分的内容:
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)。
这一部分的内容,通过Collection对象,还是要实现上边的两个实例。
二,在ADO.NET中利用Collection对象,将其作为参数传给存贮过程
通过实例,大家对各个特性和参数的如何使用,有更深刻的感性认识。同时,通过
这些实例的改造,也可做出符合自己的程序代码。
这次,还是主要输出Sample,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:- //---Main Sub
- private void btnCollection_Click(object sender, EventArgs e)
- {
- //------利用OrderItem object
- List<OrderItem> orderItems = new List<OrderItem>();
- orderItems.Add(new OrderItem() { OrderId = 901, CustomerId = 67, OrderedAt = DateTime.Now });
- orderItems.Add(new OrderItem() { OrderId = 902, CustomerId = 68, OrderedAt = DateTime.Now });
- OrderItemCollection itemCollection = new OrderItemCollection();
- itemCollection.AddRange(orderItems);
- //------利用OrderDetail object
- List<OrderDetail> orderDetails = new List<OrderDetail>();
- orderDetails.Add(new OrderDetail() { OrderId = 901, LineNumber = 1, ProductId = 34, Quantity = 2, Price = 10.5m });
- orderDetails.Add(new OrderDetail() { OrderId = 901, LineNumber = 2, ProductId = 100, Quantity = 45, Price = 3.8m });
- orderDetails.Add(new OrderDetail() { OrderId = 901, LineNumber = 3, ProductId = 56, Quantity = 67, Price = 9.1m });
- orderDetails.Add(new OrderDetail() { OrderId = 902, LineNumber = 1, ProductId = 88, Quantity = 5, Price = 88.5m });
- orderDetails.Add(new OrderDetail() { OrderId = 902, LineNumber = 2, ProductId = 1, Quantity = 345, Price = 0.465m });
- OrderDetailCollection detailCollection = new OrderDetailCollection();
- detailCollection.AddRange(orderDetails);
- //----
- using (SqlConnection conn = new SqlConnection("Data Source=;Initial Catalog=AdventureWorks;User ID=sa;Password="))
- {
- conn.Open();
- //---Passing a Table-Valued Parameter to a Stored Pcocedure
- using (SqlCommand cmd = new SqlCommand("dbo.OrderItem$Insert", conn))
- {
- cmd.CommandType = CommandType.StoredProcedure;
- //---注意:下边的两个参数名,要和SP的参数名一致。
- SqlParameter tvpOrderItem = cmd.Parameters.AddWithValue("@OrderHeaders", itemCollection);
- SqlParameter tvpOrderDetail = cmd.Parameters.AddWithValue("@OrderDetails", detailCollection);
- tvpOrderItem.SqlDbType = SqlDbType.Structured;
- tvpOrderDetail.SqlDbType = SqlDbType.Structured;
- cmd.ExecuteNonQuery();
- }
- //---Streadming rows with a dataReader
- string sql = @"select tvp1.OrderId, tvp1.CustomerId, tvp2.LineNumber, tvp2.ProductId
- from dbo.OrderItem as tvp1 INNER JOIN @tvpDetail as tvp2 ON tvp1.OrderId=tvp2.OrderId
- order by tvp2.OrderId, tvp2.LineNumber;";
- SqlCommand readCommand = new SqlCommand(sql, conn);
- readCommand.CommandType = CommandType.Text;
- SqlParameter tvpDetail = readCommand.Parameters.AddWithValue("@tvpDetail", detailCollection);
- tvpDetail.SqlDbType = SqlDbType.Structured;
- tvpDetail.TypeName = "dbo.OrderDetail$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();
- // Output results:
- //------------------
- //OrderId=901, CustomrId=67, LineNumber=1, ProductId=34
- //OrderId=901, CustomrId=67, LineNumber=2, ProductId=100
- //OrderId=901, CustomrId=67, LineNumber=3, ProductId=56
- //OrderId=902, CustomrId=68, LineNumber=1, ProductId=88
- //OrderId=902, CustomrId=68, LineNumber=2, ProductId=1
- //------------------
- conn.Close();
- }
- }
- //---OrderItem object
- public sealed class OrderItem
- {
- public int OrderId { get; set; }
- public int CustomerId { get; set; }
- public DateTime OrderedAt { get; set; }
- }
- //---OrderDetail object
- public sealed class OrderDetail
- {
- public int OrderId { get; set; }
- public int LineNumber { get; set; }
- public int ProductId { get; set; }
- public int Quantity { get; set; }
- public decimal Price { get; set; }
- }
- //---OrderItemCollection
- public sealed class OrderItemCollection: List<OrderItem>, IEnumerable<SqlDataRecord>
- {
- #region IEnumerable<SqlDataRecord> Members
- public new IEnumerator<SqlDataRecord> GetEnumerator()
- {
- SqlDataRecord record = new SqlDataRecord(
- new SqlMetaData("OrderId", SqlDbType.Int),
- new SqlMetaData("CustomerId", SqlDbType.Int),
- new SqlMetaData("OrderedAt", SqlDbType.DateTime));
- foreach(OrderItem item in this.ToArray())
- {
- record.SetInt32(0, item.OrderId);
- record.SetInt32(1, item.CustomerId);
- record.SetDateTime(2, item.OrderedAt);
- yield return record;
- }
- }
- #endregion
- }
- //---OrderDetailCollection
- public sealed class OrderDetailCollection: List<OrderDetail>, IEnumerable<SqlDataRecord>
- {
- #region IEnumerable<SqlDataRecord> Members
- public new IEnumerator<SqlDataRecord> GetEnumerator()
- {
- SqlDataRecord record = new SqlDataRecord(
- new SqlMetaData("OrderId", SqlDbType.Int),
- new SqlMetaData("LineNumber", SqlDbType.Int),
- new SqlMetaData("ProductId", SqlDbType.Int),
- new SqlMetaData("Quantity", SqlDbType.Int),
- new SqlMetaData("Price", SqlDbType.Money));
- foreach (OrderDetail detail in this.ToArray())
- {
- record.SetInt32(0, detail.OrderId);
- record.SetInt32(1, detail.LineNumber);
- record.SetInt32(2, detail.ProductId);
- record.SetInt32(3, detail.Quantity);
- record.SetDecimal(4, detail.Price);
- yield return record;
- }
- }
- #endregion
- }
复制代码 三,其他
通过Table-Values三部分的内容描述和实例,相信大家对TVP的应用有了一定的了解。
在编程中也许有人还是习惯在插入多项或Select多行数据时,使用笨拙的逗号分隔列表或XML,
虽其能够胜任,但不是以习惯的对象方式存在,而且存取速度也很慢。
所以,我建议大家在使用IN语句等需要发送多行数据的编程时,多考虑使用TVP的方式,会取满意的效果。
关于这方面的内容,还需要大家不断的交流和探讨。
四,参考文档
参看URL:
ms-help://MS.SQLCC.v10/MS.SQLSVR.v10.en/s10de_1devconc/html/5e95a382-1e01-4c74-81f5-055612c2ad99.htm
ms-help://MS.MSDNQTR.v90.en/wd_adonet/html/370c16d5-db7b-43e3-945b-ccaab35b739b.htm |
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