Examples of org.apache.ojb.broker.query.QueryByIdentity

org.apache.ojb.broker.query.QueryByIdentity
Represents a search by identity. "find the article with id 7" could be represented as:

Article example = new Article(); example.setId(7); Query qry = new QueryByIdentity(example);
The PersistenceBroker can retrieve Objects by examples as follows:

PersistenceBroker broker = PersistenceBrokerFactory.createPersistenceBroker(); Collection col = broker.getObjectByQuery(qry);
This Class can also handle working with OJB Identity objects: "find the article with Identity xyz" could be represnted as

Article example = new Article(); example.setId(7); Identity xyz = broker.serviceIdentity().buildIdentity(example); Query qry = new QueryByIdentity(xyz); Collection col = broker.getObjectByQuery(qry);
But in this case a smarter solution will be

Identity xyz = broker.serviceIdentity().buildIdentity(Article.class, new Integer(7)); Collection col = broker.getObjectByIdentity(xyz); @author Thomas Mahler @version $Id: QueryByIdentity.java,v 1.9.2.3 2005/12/21 22:27:09 tomdz Exp $

        Product example = new Product();


        example.setId(id);


        // 2. build a QueryByIdentity from this sample instance:
        Query query = new QueryByIdentity(example);


        try
        {
            // 3. start broker transaction
            broker.beginTransaction();

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        Product example = new Product();


        example.setId(id);


        // 2. build a QueryByIdentity from this sample instance:
        Query query = new QueryByIdentity(example);


        try
        {
            // start broker transaction
            broker.beginTransaction();

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        Product result  = null;


        example.setId(id);


        // 2. build a QueryByIdentity from this sample instance:
        Query             query  = new QueryByIdentity(example);
        PersistenceBroker broker = null;


        try
        {
            // 3. get a broker and lookup the product specified by the QBE

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        Product example = new Product();


        example.setId(id);


        // 2. build a QueryByIdentity from this sample instance:
        Query             query  = new QueryByIdentity(example);
        PersistenceBroker broker = null;


        try
        {
            // 3. get a broker

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        Product example = new Product();


        example.setId(id);


        // 2. build a QueryByIdentity from this sample instance:
        Query query = new QueryByIdentity(example);


        try
        {
            // 3. start broker transaction
            broker.beginTransaction();

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        Product example = new Product();


        example.setId(id);


        // 2. build a QueryByIdentity from this sample instance:
        Query query = new QueryByIdentity(example);


        try
        {
            // start broker transaction
            broker.beginTransaction();

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        for (i = 1; i < 4; i++)
        {
            ProductGroupWithArray example = new ProductGroupWithArray();
            example.setId(i);
            ProductGroupWithArray group =
                (ProductGroupWithArray) broker.getObjectByQuery(new QueryByIdentity(example));
            assertEquals("should be equal", i, group.getId());
            //System.out.println(group + "\n\n");


            broker.delete(group);
            broker.store(group);

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        {
            ProductGroupWithTypedCollection example = new ProductGroupWithTypedCollection();
            example.setId(i);
            ProductGroupWithTypedCollection group =
                (ProductGroupWithTypedCollection) broker.getObjectByQuery(
                    new QueryByIdentity(example));
            assertEquals("should be equal", i, group.getId());
            //System.out.println(group + "\n\n");


            broker.delete(group);
            broker.store(group);

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        broker.commitTransaction();
        broker.clearCache();
        Article cached =
                (Article) broker.serviceObjectCache().lookup(tmpOID);
        assertNull("After flushing Object should be not in cache", cached);
        Article article = (Article) broker.getObjectByQuery(new QueryByIdentity(tmpOID));
        cached = (Article) broker.serviceObjectCache().lookup(tmpOID);
        assertNotNull("now object should be found in cache", cached);
        assertEquals("should be the same Identity", new Identity(cached, broker), new Identity(article,broker));
        assertEquals("objects should have identical values", cached.toString(), article.toString());
    }

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        tx.abort();


        tx = (TransactionExt) odmg.newTransaction();
        tx.begin();
        broker = tx.getBroker();
        QueryByIdentity query2 = new QueryByIdentity(obj);
        Object result = broker.getObjectByQuery(query2);
        tx.commit();


        assertNull("We should not find objects from aborted tx", result);
    }

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org.apache.ojb.broker.BrokerExamples

org.apache.ojb.broker.cache.ObjectCacheTest

org.apache.ojb.broker.core.PersistenceBrokerImpl

org.apache.ojb.broker.PersistenceBrokerTest

org.apache.ojb.broker.PolymorphicExtents

org.apache.ojb.broker.prevayler.demo.UCDeleteProduct

org.apache.ojb.broker.prevayler.demo.UCEditProduct

org.apache.ojb.broker.TypedCollectionsTest

org.apache.ojb.odmg.NamedRootsMap

org.apache.ojb.odmg.ODMGRollbackTest

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