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我从调用 Web 服务的类中收到以下错误。

"You have uncommitte​d work pending. Please commit or rollback before calling out"

这是调用 Web 服务的类：

global class myWS   
{   

   WebService static string invokeExternalWs(string childValue, string parentValue)   
    {   
        HttpRequest req = new HttpRequest();   
        req.setEndpoint('https://externalURL/Services');   
        req.setMethod('POST');   
        req.setHeader('Content-Type', 'text/xml; charset=utf-8');   
        req.setHeader('SOAPAction', 'http://externalService/externalMethod');  
        string b = '--soap request goes here--';   
        req.setBody(b);   
        Http http = new Http();   
        try {   
          //Execute web service call here 
          String xObjectID ='';   
          HTTPResponse res = http.send(req);
          Dom.Document doc = res.getBodyDocument();
          String soapNS = 'http://schemas.xmlsoap.org/soap/envelope/'; 
          Dom.XmlNode root = doc.getRootElement();
          for(dom.XmlNode node1 : root.getChildElements()) {
               for(dom.XmlNode node2 : node1.getChildElements()) {
                   for(dom.XmlNode node3 : node2.getChildElements()) {
                      for(dom.XmlNode node4 : node3.getChildElements()) {
                          xObjectID = node4.getText();
                       }
                   }
               }
             }

         return xObjectID;
       } catch(System.CalloutException e){   
          return 'ERROR:' + e;   
     }          
}   
}

更新：这是我正在执行 myWS 的课程

public void applyURLString(ID ArgBuildID) {

    Builder__c current_build = [SELECT id, name, LLURL__c, column1, column2, Opportunity__c
                FROM Builder__c
                WHERE id = :ArgBuildID];

        if(current_build.LLURL__c == null || current_build.LLURL__c.trim().length() == 0)
            {

                String tmpFolderName = current_build.column1 + ' - ' + current_build.column2;

                String LLWSResultPattern = '[0-9]{2,}';

                String myWSXMLResult = myWS.invokeExternalWs(tmpFolderName,'test');

                Boolean LLWSPatternMatched = pattern.matches(LLWSResultPattern,myWSXMLResult);
                if(LLWSPatternMatched)
                {
                    Opportunity oppt = [SELECT Id,Name 
                                        FROM Opportunity 
                                        WHERE Id = :current_build.Opportunity__c
                                        LIMIT 1];   
                    oppt.LLURL__c = 'https://someService/' + myWSXMLResult;
                    update oppt;
                } 
            } 
    }

更新 #2 - 这里是 applyURLString() 被执行的地方。这是在我的 HTTP 请求之前执行 DML 的唯一位置。但是我需要新的 Builder 记录的 ID。

Builder__c insertBuild = new Builder__c();      
insertBuild.Opportunity__c = opportunityId;
insertBuild.Product_Group__c = selectedBuild.Product_Group__c;
insertBuild.Manual_Build_Product__c = selectedBuild.Manual_Build_Product__c;

insert insertBuild;

applyURLString(insertBuild.Id);

任何想法为什么会发生此错误？

4

1 回答 1

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@JCD 使用 @future 注释的建议解决了我的问题。再次感谢！

于 2012-05-11T16:59:00.177 回答