Examples of com.db4o.query.Query.descend()

com.db4o.query.Query.descend()
returns a reference to a descendant node in the query graph.

If the node does not exist, it will be created.

All classes represented in the query node are tested, whether they contain a field with the specified field name. The descendant Query node will be created from all possible candidate classes. @param fieldName path to the descendant. @return descendant {@link Query} node

  public static void retrieveByDefaultFieldValue(ObjectContainer db) {
    Pilot somebody = new Pilot("Somebody else", 0);
    db.set(somebody);
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("points").constrain(new Integer(0));
    ObjectSet result = query.execute();
    listResult(result);
    db.delete(somebody);
  }

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  }


  public static void retrieveSorted(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("name").orderAscending();
    ObjectSet result = query.execute();
    listResult(result);
    query.descend("name").orderDescending();
    result = query.execute();
    listResult(result);

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    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("name").orderAscending();
    ObjectSet result = query.execute();
    listResult(result);
    query.descend("name").orderDescending();
    result = query.execute();
    listResult(result);
  }


  public static void clearDatabase(ObjectContainer db) {

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            pquery = query;
            // descend one time for each node in the pname (which may be a dot
            // notated property path)
            final PropertyPath path = new PropertyPath(pname);
            for(final String node : path.nodes()) {
              pquery = pquery.descend(node);
            }
          }
          else {
            pquery = query.descend(pname);
          }

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            pquery = query;
            // descend one time for each node in the pname (which may be a dot
            // notated property path)
            final PropertyPath path = new PropertyPath(pname);
            for(final String node : path.nodes()) {
              pquery = pquery.descend(node);
            }
          }
          else {
            pquery = query.descend(pname);
          }

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        * prevent previously added entries in long running storage instances
        */
       clearDynamicElements(persistentFeed);
        Query query = this.container.query();
        query.constrain(DB4oEntry.class);
        query.descend("feedId").constrain(feed.getId()).equal();
        query.descend("updateTime").orderDescending();


        ObjectSet<DB4oEntry> set = query.execute();
       
        int size = set.size();

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        */
       clearDynamicElements(persistentFeed);
        Query query = this.container.query();
        query.constrain(DB4oEntry.class);
        query.descend("feedId").constrain(feed.getId()).equal();
        query.descend("updateTime").orderDescending();


        ObjectSet<DB4oEntry> set = query.execute();
       
        int size = set.size();

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        storage.storeEntry(e1);


        storage = this.controller.getStorage();
        Query query = getContainer().query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e.getId());
        ObjectSet resultSet = query.execute();
        assertEquals(1, resultSet.size());
        BaseEntry storedEntry = (BaseEntry) resultSet.next();
        assertEquals("1", storedEntry.getVersionId());

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        container.close();
        container = getContainer();
        Query query = container.query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e.getId());
        ObjectSet resultSet = query.execute();
        assertEquals(0, resultSet.size());


        // #### test version matching
        ServerBaseEntry eVersion = createServerBaseEntry();

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        storage.deleteEntry(e1);
        container.close();
        container = getContainer();
        query = container.query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e1.getId());
        resultSet = query.execute();
        assertEquals(0, resultSet.size());


        // ############ test concurrency

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