how to assign dataProvider to DataGrid Dyanmically in flex?

i done as follows

i have a method with brings data of particular table, as given my parameter to that method,

now i want to fetch data from corresponding table and it too list, and send back flex and form dynamically Grid & add dataprovider dynamically as for its corresponded table colomns in flex side ?

Remote objec(java class)

 public List<List<String>> getMasterTableData(String name) 
 { 
  String designMaster = "tbl_design_master"+name;

  String masterTableName = "tbl_master"+name; 

  String[][] res ;

  List<List<String>> list = new ArrayList<List<String>>();

  try 
  {
   st = connection.createStatement();

   ResultSet rs1 = st.executeQuery("select * from "+designMaster);

   int len = 0;

   while(rs1.next())
   { len++; }

   ResultSet rs2 = st.executeQuery("select * from "+masterTableName);

   while(rs2.next())
   { 
    List<String>  ll = new ArrayList<String>();

    for(int i=1;i<=len; i++)
    {
     ll.add(rs2.getString(i));     
    }    
    list.add(ll);
   }   
  }
  catch (SQLException e) {   
   e.printStackTrace();
  }

  return list;
 }

flex code :

<mx:RemoteObject id="RO" destination="adminServiceImpl"> 
 <mx:method name="getMasterDesign" result="getMasterDesignRH(event)" fault="FH(event)" />
 <mx:method name="getMasterTableData" result="getMasterTableDataRH(event)" fault="FH(event)"/>
</mx:RemoteObject> 

 <mx:Script>
  <![CDATA[

  [Bindable] private var ac:ArrayCollection = new ArrayCollection(); 

  public function init(Str:String):void
  {
   RO.getMasterDesign(Str);

   Application.application.selectedgridItem = Str;

   RO.getMasterTableData(Str);
  }

  private function getMasterDesignRH(event:ResultEvent):void
  {
   Application.application.designList = event .result as ArrayCollection; 

   var aColumns:Array = new开发者_如何学Python Array();   

   for(var i:int=0; i< Application.application.designList.length; i++)
   { 
    var dgc:DataGridColumn = new DataGridColumn();

    dgc.headerText = Application.application.designList.getItemAt(i).colName; 

    //dgc.dataField = Application.application.designList.getItemAt(i).colName;

    aColumns.push(dgc);   
   }
   mainGrid.columns = aColumns;
  }
  private function getMasterTableDataRH(event:ResultEvent):void
  {
   ac = event.result as ArrayCollection; 

   mainGrid.dataProvider  = ac;  
  }  
  private function FH(event:FaultEvent):void{ 
   Alert.show(event.fault.faultString);  
  }


  ]]>
 </mx:Script>

  <mx:HBox width="100%" height="80%">
   <mx:DataGrid id="mainGrid" width="100%" height="100%" />
  </mx:HBox>

getMasterDesign is an ArrayCollection, which is filled with the column names and components to be displayed

Ex : getMasterDesign(emp) empMasterDesign table looks like as follows

colName    component 
--------------------
EmpName    textBox
empSal     textBox 
empDesi    ComboBox 

empMasterData:

empName | EmpSal | EmpDesi 
abc       1000     Cler## Heading ##ck 
xyz       2000     Manager

Now i want this create a Datagrid in flex dynamically by using its design & master data table in action script i done everyting , my dataGrid had formed as for his master design,but data is not showing ?

---

You must set the dataField to the appropriate value. From the given data, it looks like colName field in the metadata and its corresponding name in the table are not the same. For example it is EmpName in the design and empName in the original table; none of the fields match - empSal vs EmpSal, empDesi vs EmpDesi. Fix that, assign colName to the dataField, and you should be good to go.