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<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span lang=ES>
public void Insert(int orderId, OrderLine orderDetail)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt;line-height:14.5pt'><span
lang=ES> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> SqlConnection connection = new
SqlConnection(connectionString);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> try</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> SqlCommand command =
connection.CreateCommand();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> command.CommandText = "INSERT
INTO [Order Details] (OrderId, " +</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> "ProductId,
UnitPrice, Quantity) " + </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> "VALUES(@OrderId,
@ ProductId, @ UnitPrice, @ Quantity) ";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> command.Parameters.Add("@
OrderId", orderId);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> command.Parameters.Add("@
ProductId", orderDetail. ProductId);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> command.Parameters.Add("@
UnitPrice", orderDetai</span><span lang=EN-US>l</span><span lang=ES>.
UnitPrice);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> command.Parameters.Add("@
Quantity", orderDetail. Quantity);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> connection.Open();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> command.ExecuteNonQuery();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> catch (Exception ex)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> ContextUtil.SetAbort();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> throw;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt;line-height:14.5pt'><span
lang=ES> finally</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> connection.Close();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=ES> ContextUtil.SetComplete();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES>}</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:0cm'><span lang=ES>}</span></p>
<h4 style='FTEL:21.45pt'><span lang=EN-US>5. </span><span
style='font-family:黑体'>客户应用程序</span></h4>
<p class=MsoNormal style='line-height:18.0pt'><span style='font-family:宋体'>建立了组件后，就可以创建客户应用程序了。为了进行测试，可以创建一个控制台应用程序。在引用程序集</span><span
lang=ES>NorthwindComponent</span><span style='font-family:宋体'>和程序集</span><span
lang=ES>System.EnterpriseServices</span><span style='font-family:宋体'>后，就可以使用静态方法</span><span
lang=ES>Order.Create()</span><span style='font-family:宋体'>创建一个新的</span><span
lang=ES>Order</span><span style='font-family:宋体'>对象。使用</span><span lang=ES>Order.AddOrderLine()</span><span
style='font-family:宋体'>给订单添加一个新订单行。</span><span lang=ES>OrderLine.Create()</span><span
style='font-family:宋体'>利用产品</span><span lang=ES>ID</span><span
style='font-family:宋体'>、价格和数量来创建订单行。在真实的应用程序中，添加</span><span lang=ES>Product</span><span
style='font-family:宋体'>类比使用产品</span><span lang=ES>ID</span><span
style='font-family:宋体'>会更好，但本例仅用于演示一般的事务处理。</span></p>
<p class=MsoNormal style='line-height:18.0pt'><span style='font-family:宋体'>最后，创建服务组件类</span><span
lang=ES>OrderControl</span><span style='font-family:宋体'>，以调用方法</span><span
lang=ES>NewOrder()</span><span style='font-family:宋体'>：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span lang=ES>Order
order = Order.Create("PICCO", DateTime.Today, "Georg Pipps",</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES>
"SalzBurg", "Austria");</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES>order.AddOrderLine(OrderLine.Create(16,
17.45F, 2));</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES>order.AddOrderLine(OrderLine.Create(67,
14, 1));</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=ES>OrderControl
orderControl = new OrderControl();</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=ES>orderControl.NewOrder(order);</span></p>
<p class=MsoNormal style='line-height:18.0pt'><span style='font-family:宋体'>可以试着把不存在的产品写到</span><span
lang=ES>OrderLine(</span><span style='font-family:宋体'>使用不在</span><span lang=ES>Products</span><span
style='font-family:宋体'>表中的产品</span><span lang=ES>id)</span><span
style='font-family:宋体'>中。在这种情况下，事务处理会中止，不会把数据写到数据库中。</span></p>
<p class=MsoNormal style='line-height:18.0pt'><span style='font-family:宋体'>在事务处理处于激活状态时，可以通过在树图中选择</span><span
lang=ES>Distributed Transaction Coordinator</span><span style='font-family:
宋体'>，在组件服务管理工具中看到事务处理，如图</span><span lang=ES>29-8</span><span style='font-family:
宋体'>所示。</span></p>
<p align=center><span lang=ES><img width=364 height=138
src="29/image008.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=ES> 29-8</span></p>
<p class=a3 style='margin-top:8.15pt;FTEL:21.45pt'><span
style='font-family:黑体'>注意：</span></p>
<p class=a1 style='FTEL:8.15pt;FTEL:21.45pt'><span
style='font-family:楷体_GB2312'>如果服务组件在事务处理中运行时对它进行调试，应注意对于该服务组件，默认的事务处理超时时间是</span><span
lang=ES>60</span><span style='font-family:楷体_GB2312'>秒。在组件服务管理工具的</span><span
lang=ES>My Computer</span><span style='font-family:楷体_GB2312'>中，选择属性中的</span><span
lang=ES>Options</span><span style='font-family:楷体_GB2312'>，就可以为整个系统修改这个默认值，也可以为每个组件选择</span><span
lang=ES>Transaction</span><span style='font-family:楷体_GB2312'>选项，修改每个组件的默认值。</span></p>
<p class=MsoNormal><span lang=ES> </span></p>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165763.htm'><font color='red'>29.6.4 示例应用程序(2)</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165760.htm'>29.6.2 事务处理的属性</a></div><div style='float:right;width:49%'>·<a href='100165761.htm'>29.6.3 事务处理的结果</a></div><div style='float:left;width:49%'>·<a href='100165762.htm'>29.6.4 示例应用程序(1)</a></div><div style='float:right;width:49%'>·<a href='100165764.htm'>29.7 小结</a></div><div style='float:left;width:49%'>·<a href='100165765.htm'>30.1 管理文件系统</a></div><div style='float:right;width:49%'>·<a href='100165766.htm'>30.1.1 表示文件和文件夹的.NET类</a></div></div>
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