Examples of com.db4o.query.Query

com.db4o.query.Query
handle to a node in a S.O.D.A. query graph.

A node in the query graph can represent multiple classes, one class or an attribute of a class.

The graph is automatically extended with attributes of added constraints (see {@link #constrain(Object)}) and upon calls to {@link #descend(java.lang.String)} that request nodes that do not yet exist.

References to joined nodes in the query graph can be obtained by "walking" along the nodes of the graph with the method {@link #descend(String)}.

{@link #execute()}evaluates the entire graph against all persistent objects.

{@link #execute()} can be called from any {@link Query} nodeof the graph. It will return an {@link ObjectSet} filled withobjects of the class/classes that the node, it was called from, represents.

Note:
{@link Predicate Native queries} are the recommended main query interface of db4o.

        storage.storeEntry(e);
        ServerBaseEntry e1 = createServerBaseEntry();
        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());


        ServerBaseFeed bFeed = new ServerBaseFeed();

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        storage.deleteEntry(e);


        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();
        storage.storeEntry(eVersion);
        eVersion.setVersion(33);
        try {
            storage.deleteEntry(eVersion);
            fail("version does not match");
        } catch (Exception ex) {
            // TODO: handle exception
        }
        try {
            storage.deleteEntry(null);
            fail("entry id is null");
        } catch (Exception ex) {
            // TODO: handle exception
        }
        storage = this.controller.getStorage();
        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


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

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        e2.setId(e.getId());
        e2.setTitle(new PlainTextConstruct("new"));
        e2.setUpdated(DateTime.now());
        storage.updateEntry(e2);
        ObjectContainer container = getContainer();
        Query query = container.query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e.getId());
        ObjectSet resultSet = query.execute();
        assertEquals(1, resultSet.size());
        BaseEntry result = (BaseEntry) resultSet.next();
        assertEquals("new", result.getTitle().getPlainText());
        assertEquals("2", result.getVersionId());

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        account.setName("simon");
        account.setPassword("somepass");
        Storage storage = this.controller.getStorage();
        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())
                .getPassword());
        try {
            storage.storeAccount(account);

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        } catch (Exception e) {
            //
        }
        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())
                .getPassword());
        account = new GDataAccount();
        account.setName("simon");
        account.setPassword("newPass");
        storage.updateAccount(account);
        container.close();
        container = getContainer();
        q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())
                .getPassword());
        container.close();
    }

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        account.setName("simon");
        account.setPassword("somepass");
        Storage storage = this.controller.getStorage();
        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());


        storage.deleteAccount(account.getName());
        container.close();
        container = getContainer();
        q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        set = q.execute();
        assertEquals(0, set.size());
        try {
            storage.deleteAccount("notstored");
            fail("account not stored");
        } catch (Exception e) {

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        container.commit();
        container.close();
        storage.storeFeed(feed, ACCOUNTNAME);


        container = getContainer();
        Query query = container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(FEEDID);
        ObjectSet set = query.execute();
        assertEquals(1, set.size());


        assertEquals(feed.getId(), ((ServerBaseFeed) set.next()).getId());
        container.close();

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        feed.setServiceConfig(conf);
        storage.storeFeed(feed, ACCOUNTNAME);


        storage.deleteFeed(FEEDID);
        container = getContainer();
        Query query = container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(FEEDID);
        ObjectSet set = query.execute();
        assertEquals(0, set.size());


        query = getContainer().query();
        query.constrain(BaseFeed.class);
        query.descend("id").constrain(FEEDID);
        set = query.execute();
        assertEquals(0, set.size());
        container.close();
    }

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        throw new ResourceNotFoundException("can not find feed for given feed id -- "
                + feedId);


    }
    private boolean checkService(String feedId,String serviceId){
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId).equal();
        query.descend("serviceType").constrain(serviceId).equal();
        return query.execute().size() == 1;
    }

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        query.descend("feed").descend("id").constrain(feedId).equal();
        query.descend("serviceType").constrain(serviceId).equal();
        return query.execute().size() == 1;
    }
    private ObjectSet getEnriesForFeedID(String feedId) {
        Query query = this.container.query();
        query.constrain(DB4oEntry.class);
        query.descend("feedId").constrain(feedId).equal();


        return query.execute();
    }

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