Dynamics CRM 2011编程系列（51）：FetchExpression(二)----JavaScript也疯狂

本文来探索下在弱客户端下通过FetchExpression来访问Dynamics CRM 2011系统中的数据。在Dynamics CRM 2011系统中客户端居然用FetchExpression来获取系统中的数据，看上去是那么的复古（当前开发人员可以使用系统的ＲＥＳＴ端点）。但本文仅仅起到一个抛砖引玉的作用，Dynamics CRM 2011 系统存在大量的消息类（ＡＰＩ）。通过这些消息类，我们可以完成对系统的各种操作（禁用记录，激活工作流等），详细内容各位看官可以参阅文章《Dynamics CRM 2011 消息类列表》。
　当然啦，如果我们在强客户端（C#,VB.Net）调用这些消息类。微软会为我们提供非常好的开发人员体验，SOAP报文的发送和接收完全被封装，一切都不需要自己干预。但如果我们要在弱客户端上调用这些消息类，那该如何是好呢？元芳你怎么看呢？
各位看官莫慌，莫慌，请参考文章《Dynamics CRM 2011编程系列（50）：使用SOAPLogger抓取报文》，在这里我已经给出了解决方案了。
　好吧，现在一切准备都完毕了，让我们动起来吧。

1.运行SOAPLogger抓取报文，在Run方法中输入填入如下代码：

FetchExpression fetchExp = new FetchExpression(@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>
  <entity name='contact'>
    <attribute name='fullname' />
    <attribute name='contactid' />
    <order attribute='fullname' descending='false' />
  </entity>
</fetch>");
      slos.RetrieveMultiple(fetchExp);

2.在output.txt文件中获取截获的SOAP报文。

HTTP REQUEST
--------------------------------------------------
POST http://msstore-test-02.northamerica.corp.microsoft.com:5550/Example/XRMServices/2011/Organization.svc/web Content-Type: text/xml; charset=utf-8
SOAPAction: http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/RetrieveMultiple 
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Body>
    <RetrieveMultiple xmlns="http://schemas.microsoft.com/xrm/2011/Contracts/Services" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
      <query i:type="a:FetchExpression" xmlns:a="http://schemas.microsoft.com/xrm/2011/Contracts">
        <a:Query><fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>
  <entity name='contact'>
    <attribute name='fullname' />
    <attribute name='contactid' />
    <order attribute='fullname' descending='false' />
  </entity>
</fetch></a:Query>
      </query>
    </RetrieveMultiple>
  </s:Body>
</s:Envelope>
--------------------------------------------------

3.当前系统中存在的数据

图1

4.在Contact实体的表单OnLoad事件中编写如下代码(用Ajax向服务器提交SOAP报文)

var queryurl = "http://Server Name/Organization Name/XRMServices/2011/Organization.svc/web";
var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
var fetchExp = ['<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">'
              , '<s:Body>'
              , '<RetrieveMultiple xmlns="http://schemas.microsoft.com/xrm/2011/Contracts/Services" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">'
              , '<query i:type="a:FetchExpression" xmlns:a="http://schemas.microsoft.com/xrm/2011/Contracts">'
              , '<a:Query>'
              , '<![CDATA['
              , '<fetch version="1.0" output-format="xml-platform" mapping="logical" distinct="false">'
              , '  <entity name="contact">'
              , '    <attribute name="fullname" />'
              , '    <attribute name="contactid" />'
              , '    <order attribute="fullname" descending="false" />'
              , '  </entity>'
              , '</fetch>'
              , ']]>'
              , '</a:Query>'
              , '</query>'
              , '</RetrieveMultiple>'
              , '</s:Body>'
              , '</s:Envelope>'];

xmlhttp.Open("POST", queryurl, false);
xmlhttp.setRequestHeader("Accept", "application/xml, text/xml, */*");
xmlhttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
xmlhttp.setRequestHeader("SOAPAction", " http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/RetrieveMultiple"); 
xmlhttp.Send(fetchExp.join('').toString());  

if (xmlhttp.readyState == 4) {  
   if (xmlhttp.status == 200) {
       alert(xmlhttp.responseText);
   } 
   } 
   else {  
  }

5.系统返回如下报文

图2

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Body>
    <RetrieveMultipleResponse xmlns="http://schemas.microsoft.com/xrm/2011/Contracts/Services" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
      <RetrieveMultipleResult xmlns:a="http://schemas.microsoft.com/xrm/2011/Contracts">
        <a:Entities>
          <a:Entity>
            <a:Attributes xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
              <a:KeyValuePairOfstringanyType>
                <b:key>fullname</b:key>
                <b:value i:type="c:string" xmlns:c="http://www.w3.org/2001/XMLSchema">Bob Li</b:value>
              </a:KeyValuePairOfstringanyType>
              <a:KeyValuePairOfstringanyType>
                <b:key>contactid</b:key>
                <b:value i:type="c:guid" xmlns:c="http://schemas.microsoft.com/2003/10/Serialization/">441f1166-5c56-e211-af85-00155d1ce818</b:value>
              </a:KeyValuePairOfstringanyType>
            </a:Attributes>
            <a:EntityState i:nil="true" />
            <a:FormattedValues xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
            <a:Id>441f1166-5c56-e211-af85-00155d1ce818</a:Id>
            <a:LogicalName>contact</a:LogicalName>
            <a:RelatedEntities xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
          </a:Entity>
          <a:Entity>
            <a:Attributes xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
              <a:KeyValuePairOfstringanyType>
                <b:key>fullname</b:key>
                <b:value i:type="c:string" xmlns:c="http://www.w3.org/2001/XMLSchema">Clark Wang1</b:value>
              </a:KeyValuePairOfstringanyType>
              <a:KeyValuePairOfstringanyType>
                <b:key>contactid</b:key>
                <b:value i:type="c:guid" xmlns:c="http://schemas.microsoft.com/2003/10/Serialization/">71e70aab-5c56-e211-af85-00155d1ce818</b:value>
              </a:KeyValuePairOfstringanyType>
            </a:Attributes>
            <a:EntityState i:nil="true" />
            <a:FormattedValues xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
            <a:Id>71e70aab-5c56-e211-af85-00155d1ce818</a:Id>
            <a:LogicalName>contact</a:LogicalName>
            <a:RelatedEntities xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
          </a:Entity>
          <a:Entity>
            <a:Attributes xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
              <a:KeyValuePairOfstringanyType>
                <b:key>fullname</b:key>
                <b:value i:type="c:string" xmlns:c="http://www.w3.org/2001/XMLSchema">Hitesh White</b:value>
              </a:KeyValuePairOfstringanyType>
              <a:KeyValuePairOfstringanyType>
                <b:key>contactid</b:key>
                <b:value i:type="c:guid" xmlns:c="http://schemas.microsoft.com/2003/10/Serialization/">87cf252c-7463-e211-9a59-00155d1ce818</b:value>
              </a:KeyValuePairOfstringanyType>
            </a:Attributes>
            <a:EntityState i:nil="true" />
            <a:FormattedValues xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
            <a:Id>87cf252c-7463-e211-9a59-00155d1ce818</a:Id>
            <a:LogicalName>contact</a:LogicalName>
            <a:RelatedEntities xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
          </a:Entity>
          <a:Entity>
            <a:Attributes xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
              <a:KeyValuePairOfstringanyType>
                <b:key>fullname</b:key>
                <b:value i:type="c:string" xmlns:c="http://www.w3.org/2001/XMLSchema">Jim Green</b:value>
              </a:KeyValuePairOfstringanyType>
              <a:KeyValuePairOfstringanyType>
                <b:key>contactid</b:key>
                <b:value i:type="c:guid" xmlns:c="http://schemas.microsoft.com/2003/10/Serialization/">396a665a-5c56-e211-af85-00155d1ce818</b:value>
              </a:KeyValuePairOfstringanyType>
            </a:Attributes>
            <a:EntityState i:nil="true" />
            <a:FormattedValues xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
            <a:Id>396a665a-5c56-e211-af85-00155d1ce818</a:Id>
            <a:LogicalName>contact</a:LogicalName>
            <a:RelatedEntities xmlns:b="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
          </a:Entity>
        </a:Entities>
        <a:EntityName>contact</a:EntityName>
        <a:MinActiveRowVersion>-1</a:MinActiveRowVersion>
        <a:MoreRecords>false</a:MoreRecords>
        <a:PagingCookie><cookie page="1"><fullname last="Jim Green" first="Bob Li" /><contactid last="{396A665A-5C56-E211-AF85-00155D1CE818}" first="{441F1166-5C56-E211-AF85-00155D1CE818}" /></cookie></a:PagingCookie>
        <a:TotalRecordCount>-1</a:TotalRecordCount>
        <a:TotalRecordCountLimitExceeded>false</a:TotalRecordCountLimitExceeded>
      </RetrieveMultipleResult>
    </RetrieveMultipleResponse>
  </s:Body>
</s:Envelope>

小结

在这里我没有处理服务器返回的ＳＯＡＰ报文，但官们可以根据自己的需要来处理它们。
在Dynamics CRM 2011 系统中，所有的消息类都能通过这样的方式在JavaScript函数中进行调用。
当然各位看官们可以结合第三方的JavaScript类库来提交SOAP报文。