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} catch (IOException e) { System.out.println( "oop error (" + e.getMessage() + ")"); } The type NameValuePair defines an array of key value pairs that are assembled and URLencoded into a query string. The method setQueryString converts the array into a query string. To execute the HTTP request, the method executeMethod is called. If the return code is 200, the request was successful. Because the HTTP request was successful does not mean that the response will contain any data. To know if there are any results, a parser will need to inspect the response. The undefined method processResults converts the response from an XML stream into a result that is added to the controller (further details of this method are beyond the scope of this chapter). The method getQueryIdentifier is used to identify which query identifier the result is associated with. The query identifier is part of the Persistent Communications pattern and is used to identify which query a result belongs to.

Note SharePoint does come with a DataView web part, which can also query SQL data sources and provide formatted output. However, to create and edit the DataView web part you must use FrontPage 2003, which introduces the ghosting problem breaking the direct link between a page and the underlying CAML template. For that reason, many SharePoint developers, including the author, avoid the use of FrontPage and thus DataView web parts. Further, the DataView does not support the show/hide capability provided by the custom SQL web part, which is based on the Base web part class.

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Google allows outside developers to access their search engine technologies by using the SOAP web service API. In the example, the Java-based Axis 1.x engine was used to convert a Web Services Description Language (WSDL) file into a client stub. The client stub performs an automatic serialization of the XML data. In essence, a WSDL file does the same thing as an XML schema file used to generate a serialization stub. The serialization stub contains a number of E B V N types that are used to serialize and deserialize XML. For reference purposes, a WSDL file does contain an XML schema file. The following source code illustrates how to call the Google search engine web service: String queryIdentifier = _parent.getQueryIdentifier(); GoogleSearch searchRequest = new GoogleSearch(); if( _endPoint.length() > 0) { searchRequest.setSoapServiceURL( _endPoint); } searchRequest.setKey( _key); searchRequest.setQueryString( _request.getQueryString()); try { GoogleSearchResult searchResult = searchRequest.doSearch(); if( searchResult != null) { GoogleSearchResultElement[] results = searchResult.getResultElements(); for( int c1 = 0; c1 < results.length; c1 ++) { _parent.addResult( new SearchResult( results[ c1].getURL(), results[ c1].getTitle(), results[ c1].getSnippet(), transactionIdentifier)); } } } catch (GoogleSearchFault e) { return; }

Pandora offers free (ad-sponsored) listening for 40 hours per month. You can upgrade to a premium account for $36 a year with unlimited listening and no ads. The Android app is free either way, but subject to the same limits of the user s account.

You learned how to use XSLT to format the result set produced by the SQL query. Although not specifically discussed here, XSLTs can be constructed to format SQL queries (or stored procedures) that produce multiple result sets. So you can return and format queries of arbitrary complexity using this web part.

function ClientCommunicator() { this.server2Client = new Asynchronous(); this.baseURL = null; this._delegated = null; this.username = null; this.password = null; this.listen = null; this.doLoop = false; this.callDelay = 500; this.preferredTypes = "text/xml"; this.index = this.instanceCount.counter; this.instances[ this.index] = this; this.instanceCount.counter ++; this.versionTracker = 0; } function PrivateLoop(index) { var tempReference = ClientCommunicator.prototype.instances[ index]; tempReference.server2Client.openCallback = function(xmlhttp) { xmlhttp.setRequestHeader("Accept", tempReference.preferredTypes); xmlhttp.setRequestHeader("X-Version-ID", tempReference.versionTracker); } tempReference.server2Client.complete = function(status, statusText, EBVN responseText, responseXML) { if(status == 200) { tempReference.versionTracker = tempReference.server2Client.getResponseHeader("X-Version-ID"); if(tempReference.listen != null) { tempReference.listen(status, statusText, responseText, responseXML); } } if(tempReference.doLoop) { window.setTimeout("PrivateLoop(" + tempReference.index + ")", tempReference.callDelay); } } tempReference.server2Client.username = tempReference.username; tempReference.server2Client.password = tempReference.password; tempReference.server2Client.get(tempReference.baseURL); } The bolded code introduces the property versionTracker, which contains the value stored in the HTTP header X-Version-ID and is the version number of the server-side state. Whenever a request is made to the server, the HTTP header X-Version-ID is added to the request and extracted from the response. On the server side, the modified GlobalStatus.doGet implementation would be as follows:

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