Examples of org.odmg.Database

org.odmg.Database
The interface for interacting with an ODMG database. Databases must be opened before starting any transactions that use the database and closed after ending these transactions.
A database application generally begins processing by accessing one or more critical objects and proceeding from there. These objects are root objects, because they lead to interconnected webs of other objects. The ability to name an object (using method bind) and retrieve it later by that name (using method lookup facilitates this start-up capability. A name is not explicitly defined as an attribute of an object. Naming an object also makes it persistent.
There is a single flat name scope per database; thus all names in a particular database are unique. @author David Jordan (as Java Editor of the Object Data Management Group) @version ODMG 3.0

     * The lookup is done one by one, that is: a primary key based lookup is used.
     */
    protected void readArticles() throws Exception
    {
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        long start = System.currentTimeMillis();
        db.open(databaseName, Database.OPEN_READ_ONLY);
        Transaction tx = odmg.newTransaction();
        tx.begin();
        for (int i = 0; i < articleCount; i++)
        {
            OQLQuery query = odmg.newOQLQuery();
            String sql = "select allArticles from " + PerformanceArticle.class.getName() + " where articleId=" + i;
            query.create(sql);
            query.execute();
        }
        tx.commit();
        long stop = System.currentTimeMillis();
        db.close();
        logger.info("querying " + articleCount + " Objects: " + (stop - start) + " msec");
    }

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        PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
        broker.clearCache();
        broker.close();


        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        OQLQuery query = odmg.newOQLQuery();
        String sql = "select allArticles from " + PerformanceArticle.class.getName() + " where articleId between " + new Integer(offsetId) + " and " + new Integer(offsetId + articleCount);
        query.create(sql);
        long start = System.currentTimeMillis();
        ManageableCollection collection = (ManageableCollection) query.execute();
        Iterator iter = collection.ojbIterator();
        int fetchCount = 0;
        while (iter.hasNext())
        {
            fetchCount++;
            PerformanceArticle a = (PerformanceArticle) iter.next();
        }
        long stop = System.currentTimeMillis();
        db.close();
        logger.info("fetching " + fetchCount + " Objects: " + (stop - start) + " msec");
    }

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     * All objects are modified and changes are written to the RDBMS with an UPDATE.
     */
    protected void updateExistingArticles() throws Exception
    {
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        Transaction tx = odmg.newTransaction();
        long start = System.currentTimeMillis();
        tx.begin();
        // update all objects
        for (int i = 0; i < articleCount; i++)

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     * test getting all (make sure basic operation is still functional)
     */
    public void testGetProjectionAttribute() throws Exception
    {
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        try
        {
            createData(db, odmg);


            // 3. Get a list of some articles

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     * test that we can create 2 objects that have a bidirectional association in ODMG API
     */
    public void testCreateWithUpdate() throws ODMGException
    {
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        Transaction tx = odmg.newTransaction();
        long currentTime = System.currentTimeMillis();


        BidirectionalAssociationObjectA a = new BidirectionalAssociationObjectA();
        a.setPk("A" + currentTime);
        BidirectionalAssociationObjectB b = new BidirectionalAssociationObjectB();
        b.setPk("B" + currentTime);


        tx.begin();
        db.makePersistent(a);
        db.makePersistent(b);
        tx.commit();


        tx.begin();
        tx.lock(a, Transaction.WRITE);
        tx.lock(b, Transaction.WRITE);

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     * @throws ODMGException
     */
    public void NOTWORKINGtestCreateWithoutUpdate() throws ODMGException
    {
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        Transaction tx = odmg.newTransaction();
        long currentTime = System.currentTimeMillis();
        BidirectionalAssociationObjectA a = new BidirectionalAssociationObjectA();
        a.setPk("A" + currentTime);
        BidirectionalAssociationObjectB b = new BidirectionalAssociationObjectB();
        b.setPk("B" + currentTime);


        tx.begin();
        b.setRelatedA(a);
        a.setRelatedB(b);
        db.makePersistent(a);
        db.makePersistent(b);
        tx.commit();


        /**
         * now make sure they are in db, A first, then B
         */

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         */
        testDeleteA();
        testDeleteB();
        testCreateWithUpdate();
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        OQLQuery query = odmg.newOQLQuery();
        int i = 0;
        query.create("select bidirectionalAssociationObjectA from " + BidirectionalAssociationObjectA.class.getName());
        Transaction tx = odmg.newTransaction();
        tx.begin();

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         */
        testDeleteA();
        testDeleteB();
        testCreateWithUpdate();
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        OQLQuery query = odmg.newOQLQuery();
        int i = 0;
        query.create("select bidirectionalAssociationObjectB from " + BidirectionalAssociationObjectB.class.getName());
        Transaction tx = odmg.newTransaction();
        tx.begin();

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         * create at least one A/B
         */
        testCreateWithUpdate();


        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        OQLQuery query = odmg.newOQLQuery();
        query.create("select bidirectionalAssociationObjectA from " + BidirectionalAssociationObjectA.class.getName());
        Transaction tx = odmg.newTransaction();
        tx.begin();
        ManageableCollection all = (ManageableCollection) query.execute();
        java.util.Iterator it = all.ojbIterator();


        while (it.hasNext())
        {
            a = (BidirectionalAssociationObjectA)it.next();
            b = a.getRelatedB();
            if (b != null)
            {
                tx.lock(b, Transaction.WRITE);
                b.setRelatedA(null);   // break relationship to avoid ri violation
            }
            db.deletePersistent(a);
        }


        tx.commit();
    }

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        /**
         * create at least one A/B
         */
        testCreateWithUpdate();
        Implementation odmg = OJB.getInstance();
        Database db = odmg.newDatabase();
        db.open(databaseName, Database.OPEN_READ_WRITE);
        OQLQuery query = odmg.newOQLQuery();
        query.create("select bidirectionalAssociationObjectB from " + BidirectionalAssociationObjectB.class.getName());
        Transaction tx = odmg.newTransaction();
        tx.begin();
        ManageableCollection all = (ManageableCollection) query.execute();
        java.util.Iterator it = all.ojbIterator();


        while (it.hasNext())
        {
            b = (BidirectionalAssociationObjectB)it.next();
            a = b.getRelatedA();
            if (a != null)
            {
                tx.lock(a, Transaction.WRITE);
                a.setRelatedB(null);    // break relationship to avoid ri violation
            }
            db.deletePersistent(b);
        }


        tx.commit();
    }

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