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29.6.4 示例应用程序(1)
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29.6.4 示例应用程序(1)
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<div style='float:left;width:49%'>·<a href='100165759.htm'>29.6.1 ACID属性</a></div><div style='float:right;width:49%'>·<a href='100165760.htm'>29.6.2 事务处理的属性</a></div><div style='float:left;width:49%'>·<a href='100165761.htm'>29.6.3 事务处理的结果</a></div><div style='float:right;width:49%'>·<a href='100165763.htm'>29.6.4 示例应用程序(2)</a></div><div style='float:left;width:49%'>·<a href='100165764.htm'>29.7 小结</a></div><div style='float:right;width:49%'>·<a href='100165765.htm'>30.1 管理文件系统</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><span lang=EN-US>29.6.4 </span><span style='font-family:黑体'>示例应用程序</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>在这个示例应用程序中，要模拟一个简化的场景：把一些新订单写到</span><span
lang=EN-US>Northwind</span><span style='font-family:宋体'>示例数据库中。如图</span><span
lang=EN-US>29-6</span><span style='font-family:宋体'>所示，多个组件和</span><span
lang=EN-US>COM+</span><span style='font-family:宋体'>应用程序一起使用。在客户应用程序中调用类</span><span
lang=EN-US>OrderControl</span><span style='font-family:宋体'>，创建新的订单。</span><span
lang=EN-US>OrderControl</span><span style='font-family:宋体'>使用</span><span
lang=EN-US>OrderData</span><span style='font-family:宋体'>组件，该组件负责在</span><span
lang=EN-US>Northwind</span><span style='font-family:宋体'>数据库的</span><span
lang=EN-US>Order</span><span style='font-family:宋体'>表中创建一个新条目。</span><span
lang=EN-US>OrderData</span><span style='font-family:宋体'>组件使用</span><span
lang=EN-US>OrderLineData</span><span style='font-family:宋体'>组件把</span><span
lang=EN-US>Order Detail</span><span style='font-family:宋体'>条目写到数据库中。</span><span
lang=EN-US>OrderData</span><span style='font-family:宋体'>和</span><span
lang=EN-US>OrderLineData</span><span style='font-family:宋体'>组件都必须参与同一个事务处理。</span></p>
<p align=center><span lang=EN-US><img width=463 height=174
src="29/image006.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 29-6</span></p>
<p class=MsoNormal><span style='font-family:宋体'>首先要创建一个</span><span lang=EN-US>C#</span><span
style='font-family:宋体'>组件库，命名为</span><span lang=EN-US>NorthwindComppnent</span><span
style='font-family:宋体'>。在文件</span><span lang=EN-US>assemblyinfo.cs</span><span
style='font-family:宋体'>中，用属性</span><span lang=EN-US>[AssemblyKeyFile]</span><span
style='font-family:宋体'>添加键文件，定义</span><span lang=EN-US>Enterprise Services</span><span
style='font-family:宋体'>应用程序属性，如下面的代码所示：</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=EN-US>[assembly: AssemblyKeyFile("../../../mykey.snk")]</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>[assembly:
ApplicationName("Wrox NorthwindDemo")]</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>[assembly:
ApplicationActivation(ActivationOption.Library)] </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>[assembly:
ApplicationAccessControl(false)]</span></p>
<h4 style='FTEL:21.45pt'><span lang=EN-US>1. </span><span
style='font-family:黑体'>实体类</span></h4>
<p class=MsoNormal><span style='font-family:宋体'>接着添加一些实体类，表示</span><span
lang=ES>Northwind</span><span style='font-family:宋体'>数据库中</span><span lang=ES>Order</span><span
style='font-family:宋体'>表和</span><span lang=ES>Order Detail</span><span
style='font-family:宋体'>表中的列。类</span><span lang=ES>Order</span><span
style='font-family:宋体'>有一个静态方法</span><span lang=ES>Create()</span><span
style='font-family:宋体'>，</span><span style='font-family:宋体'>它创建并返回类</span><span
lang=ES>Order</span><span style='font-family:宋体'>的一个新实例</span><span
style='font-family:宋体'>，</span><span style='font-family:宋体'>用传送给该方法的参数初始化这个实例。类</span><span
lang=EN-US>Order</span><span style='font-family:宋体'>还有一些只读属性，以访问字段</span><span
lang=EN-US>orderId</span><span style='font-family:宋体'>、</span><span lang=EN-US>customerId</span><span
style='font-family:宋体'>、</span><span lang=EN-US>orderData</span><span
style='font-family:宋体'>、</span><span lang=EN-US>shipAddress</span><span
style='font-family:宋体'>、</span><span lang=EN-US>shipCity</span><span
style='font-family:宋体'>和</span><span lang=EN-US>shipCountry</span><span
style='font-family:宋体'>。</span><span lang=EN-US>orderId</span><span
style='font-family:宋体'>在类</span><span lang=EN-US>Order</span><span
style='font-family:宋体'>的创建阶段是未知的，但因为</span><span lang=ES>Northwind</span><span
style='font-family:宋体'>数据库中的</span><span lang=ES>Order</span><span
style='font-family:宋体'>表有一个自动递增的属性，所以</span><span lang=EN-US>orderId</span><span
style='font-family:宋体'>仅在订单写入数据库中后才已知。方法</span><span lang=EN-US>SetOrderId()</span><span
style='font-family:宋体'>用于在订单写入数据库后设置相应的</span><span lang=EN-US>id</span><span
style='font-family:宋体'>。因为这个方法由同一程序集中的类调用，所以这个方法的访问级别被设置为</span><span
lang=EN-US>internal</span><span style='font-family:宋体'>。方法</span><span
lang=EN-US>AddOrderLine()</span><span style='font-family:宋体'>把订单细节添加到订单中。</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=EN-US>using System;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System.Collections;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>namespace
Wrox.ProCSharp.EnterpriseServices</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public class Order</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public static Order Create(string customerId, DateTime orderDate,</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
string shipAddress, string shipCity, string shipCountry)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Order o = new Order();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
o. customerId = customerId;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
o. orderDate = orderDate;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
o. shipAddress = shipAddress;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
o. shipCity = shipCity;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
o. shipCountry = shipCountry;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return o;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public Order()</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
internal void SetOrderId(int orderId)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
this. orderId = orderId;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public void AddOrderLine(OrderLine orderLine)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
orderLines.Add(orderLine);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
private int orderId;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
private string customerId;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
private DateTime orderDate;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
private string shipAddress;</span></p>
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