Cannot read an ArrayCollection variable assigned by LCDS

Question

Hi,<br /><br />      I am new to flex and lcds.  pls. help me to understand.  All I am trying to do here is take the hibernate sample from lcds sample application and replace the grid control with a tree control.  In order achieve this, I was trying to convert the ArrayCollection into an XMLListCollection object through an actionscript in a function called convertToXML.  How ever, I'm having the difficulty in this conversion.  When i tried to debug the action script, the arraycollection, which is suppose to be with full values, seems to empty.  But, still it shows up the records in the grid.  pls. help to understand, why, I can't manipulate the ArrayCollection?<br /><br />  For your reference, Following is the modifed modified lines of the original lcds sample code.<br /><br /><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*" layout="absolute" <br />     width="100%" height="100%"<br />    pageTitle="Hibernate"<br />     creationComplete="convertToXML()"><br /><br />     <!--<br />          <mx:Tree id="list" width="100%" height="100%" dataProvider="{projectData}" labelField="@name"/><br />     --><br />          <mx:DataGrid id="list" width="100%" height="100%" dataProvider="{contacts}"<br />               doubleClick="openTab(list.selectedItem as Contact)" doubleClickEnabled="true"><br />               <mx:columns><br />                    <mx:DataGridColumn dataField="firstName" headerText="First Name"/><br />               </mx:columns><br />          </mx:DataGrid><br /><br />               [Bindable]<br />            private var projects:XML =<br />              <list><br />                <projects name="Projects" code="0"><br />                </projects><br />              </list>;<br /><br />            [Bindable]<br />            private var projectData:XMLListCollection = <br />                new XMLListCollection(projects.projects);<br />               <br />               private function convertToXML():void {<br />                    ds.fill(contacts, 'all', []);<br />                    for each (var proj:Contact in contacts) {<br />                         addProject(proj.lastName + ", " + proj.firstName);     <br />                    }                    <br />               }<br />               <br />               private function addProject(projName:String):void {<br />                var newNode:XML = <project/>;<br />                newNode.@name = projName;<br />                var proj:XMLList = projects.projects.(@name == "Projects");<br />                if( proj.length() > 0 ) {<br />                    proj[0].appendChild(newNode);<br />                }<br />            }<br /><br />               private function treeLabel(item:Object):String {<br />                var node:XML = XML(item);<br />                if( node.localName() == "department" )<br />                    return node.@title;<br />                else<br />                    return node.@name;<br />            }

Answer 1

If I understand correctly you must read a BLOB from a foregin database but have no privleges to create any supporting objects. This sounds painful.
Options to get to the BLOB include (all with problems to solve)
* through database link
* extract LOB to OS and re-load into database
**flat file
**datapump file
Some options - I hope someone provides better ideas, but until that happens ...
Can you create objects on the other side - where the BLOB comes from? If you can, consider writing a (pipelined?) function to read the BLOB, chop it up into smaller pieces, transfeer the pieces over a database link, and reassemble the pieces in the remote database using DBMS_LOB in PL/SQL. Not elegant.
You should be able to use the scheduler to create a job to use datapump to extract the BLOB and possibly transfer it too but how to access the OS file? You said you have no privileges to create objects, and that would include external tables. Could you find an existing directory object and use the folder already defined (risky; using a different application's infrastructure can be hard to maintain and will break when the underlying directly goes away)?
Edited by: riedelme on Jun 13, 2011 12:08 PM