Flex data services and data managment.

Question

Hi!
I have a question about data services with data managment enabled in Adobe Flex Builder 4. The issue is more theoretical than practical.
When I need to remove an item from the DataProvider  I use the delete method of autogenerated service, but when I need to add or update item in DataProvider, I use methods of DataProvider ArrayCollection directly (addItem ...). When I try to remove item from the DataProvider with removeAt method, no changes made to database after commit. Why and how this stuff works?
P.S. Sorry for my bad English, I use Google transltate.

Answer 1

Thanks for the reply. Yes, I did compile all the Java and it
works OK with a simple Java program. It just will not work in a
Flex application.
The java classes are:
RRA:
package blah.myPackage;
import java.util.List;
import java.util.Collection;
import flex.data.DataSyncException;
import flex.data.assemblers.AbstractAssembler;
class RRA extends AbstractAssembler
public Collection fill( List fillParameters )
RRS service = new RRS();
return service.getSome();
RRS:
package blah.myPackage;
import java.util.ArrayList;
import java.util.List;
import java.sql.*;
import flex.EORS.*;
class RRS
public List getSome()
ArrayList list = new ArrayList();
String str = "bob";
RR rr = new RR(str);
list.add(rr);
return list;
RR:
package blah.myPackage;
class RR
private String name;
public RR() { }
public RR(String name)
this.name = name;
public String getName()
return this.name;
public void setName(String name)
this.name = name;
I started with something that retrieved data from a database
but watered it down just to try and get some kind of communication
between Flex and Java.