100165695.htm
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HTM
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<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
...</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
int queryResult = insertCommand.ExecuteNonQuery();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (queryResult == 1)</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>
daEvents = new System.Data.OleDb.OleDbDataAdapter(</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
"SELECT * FROM Events", oleDbConnection1);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
ds = (DataSet)Application["ds"];</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
ds.Tables["Events"].Clear();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
daEvents.Fill(ds, "Events");</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Application.Lock();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=FR>
Application["ds"] = ds;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=FR>
</span><span lang=EN-US>Application.UnLock();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
oleDbConnection1.Close();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=a6 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>最后，返回</span><span lang=EN-US>queryResult</span><span
style='font-family:宋体'>，以便让客户知道查询是否成功：</span></p>
<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US> [WebMethod]</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public int AddEvent(String eventName, String eventRoom,</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
String eventAttendees, String eventDate)</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=a6 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>
return queryResult;</span></p>
<p class=a6 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>至此，就完成了</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>服务的所有工作，如同以前，可以对</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>服务进行测试，测试的方法就是把</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>浏览器指向</span><span lang=EN-US>.asmx</span><span
style='font-family:宋体'>文件，这样，不用编写任何客户机代码，就可以添加记录，查看由</span><span lang=EN-US>GetData()</span><span
style='font-family:宋体'>返回的</span><span lang=EN-US>DataSet</span><span
style='font-family:宋体'>的</span><span lang=EN-US>XML</span><span
style='font-family:宋体'>表示。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在继续之前，需要讨论</span><span
lang=EN-US>DataSet</span><span style='font-family:宋体'>对象和</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>服务的组合使用。初看起来这似乎是交换数据的一种荒谬方式，而实际上这是一种极其有用的技术。</span></p>
<p class=MsoNormal><span lang=EN-US>DataSet</span><span style='font-family:
宋体'>类的用途非常广泛，如果查看为</span><span lang=EN-US>GetData()</span><span
style='font-family:宋体'>方法生成的</span><span lang=EN-US>WSDL</span><span
style='font-family:宋体'>，就会看到如下内容：</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> <s:element FTEL="GetDataResponse"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <s:complexType /></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <s:sequence></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
<s:element minOccurs="0" maxOccurs="1"</span><span
lang=EN-US style='font-size:10.0pt'> </span><span lang=EN-US>FTEL="GetDataResult"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:27.65pt;line-height:13.0pt'><span
lang=EN-US>
<s:complexType></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <s:sequence></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <s:element
ref=”s:schema” /></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <s:any
/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
</s:sequence></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
</s:complexType></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </s:element></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </s:sequence></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </s:complexType></span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
</s:element></span></p>
<p class=MsoNormal><span style='font-family:宋体'>可以看出，这是非常一般的代码，允许传送进来的</span><span
lang=EN-US>DataSet</span><span style='font-family:宋体'>对象包含用内联模式指定的任何数据。但是，这表示</span><span
lang=EN-US>WSDL</span><span style='font-family:宋体'>没有完整地描述</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>服务。对于</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>客户这不是个问题，在前面的示例中传送简单的字符串时，一切都很正常，惟一的区别是我们交换了一个</span><span
lang=EN-US>DataSet</span><span style='font-family:宋体'>对象。但是，非</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>客户必须提前了解要传送的数据，或者某个等价的</span><span
lang=EN-US>DataSet</span><span style='font-family:宋体'>类，才能访问数据。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>这个问题的解决方法是把数据重新封装为另一种格式，例如结构数组。但是，这里使用</span><span
lang=EN-US>DataSet</span><span style='font-family:宋体'>对象不会出问题，而且还可以大大简化其他代码。</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='100165695.htm'><font color='red'>26.4.1 会议登记 Web服务</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165692.htm'>26.3.1 创建Web服务</a></div><div style='float:right;width:49%'>·<a href='100165693.htm'>26.3.2 使用Web服务</a></div><div style='float:left;width:49%'>·<a href='100165694.htm'>26.4 扩充会议登记示例</a></div><div style='float:right;width:49%'>·<a href='100165696.htm'>26.4.2 会议登记客户程序</a></div><div style='float:left;width:49%'>·<a href='100165697.htm'>26.5 使用SOAP标题交换数据</a></div><div style='float:right;width:49%'>·<a href='100165698.htm'>26.6 小结</a></div></div>
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