Retrieve a collection from persistent storage

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Retrieve a collection from persistent storage

Import the following classes:
- net.rim.device.api.system.PersistentStore
- java.util.Vector
Import the net.rim.device.api.synchronization.SyncCollection interface.
To provide the BlackBerry® device application with access to the newest SyncCollection data from the PersistentStore, invoke the PersistentStore.getPersistentObject() method using the ID of the SyncCollection.
```
private PersistentObject _persist; 
private Vector _contacts; 
private static final long PERSISTENT_KEY = 0x266babf899b20b56L;
_persist = PersistentStore.getPersistentObject( PERSISTENT_KEY );
```
Store the returned data in a vector object. _contacts = (Vector)_persist.getContents();

Create a method to provide the BlackBerry device application with the newest SyncCollection data before a wireless data backup session begins.

public void beginTransaction()
{
_persist = PersistentStore.getPersistentObject(PERSISTENT_KEY);        
_contacts = (Vector)_persist.getContents();
}

Create code to manage the case where the SyncCollection you retrieve from the PersistentStore is empty.

if( _contacts == null )
{
_contacts = new Vector();
_persist.setContents( _contacts );
_persist.commit();
}

Parent topic: Collections

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Retrieve a collection from persistent storage