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 $

        else
        {
            // if query is Identity based transform it to a criteria based query first
            if (query instanceof QueryByIdentity)
            {
                QueryByIdentity qbi = (QueryByIdentity) query;
                Object oid = qbi.getExampleObject();
                // make sure it's an Identity
                if (!(oid instanceof Identity))
                {
                    oid = new Identity(oid, this);
                }

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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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        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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        broker.beginTransaction();
        broker.store(samplePG);
        broker.commitTransaction();
        broker.clearCache();


        InterfaceProductGroup pg = (InterfaceProductGroup) broker.getObjectByQuery(new QueryByIdentity(samplePG));
        List list = pg.getAllArticles();
        assertNotNull(list);
        assertEquals(3, list.size());
        NumberRange range = new NumberRange(a1_.getArticleId(), a3_.getArticleId());
        InterfaceArticle a1 = null;

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        {
            TransactionImpl tx = txManager.getCurrentTransaction();
            PersistenceBroker broker = tx.getBroker();


            NamedRootsEntry stored =
                    (NamedRootsEntry) broker.getObjectByQuery(new QueryByIdentity(entry));
            if (stored != null)
            {
                throw new ObjectNameNotUniqueException("object key already found, the key " + key + " is not unique");
            }
            else

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        try
        {
            TransactionImpl tx = txManager.getCurrentTransaction();
            PersistenceBroker broker = tx.getBroker();
            NamedRootsEntry stored =
                    (NamedRootsEntry) broker.getObjectByQuery(new QueryByIdentity(example));
            if (stored == null)
            {
                throw new ObjectNameNotFoundException("Could not find a bound object for key " + key);
            }
            else

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        // 1. build an example object with matching primary key values:
        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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        // we do this by a query by example (QBE):
        // 1. build an example object with matching primary key values:
        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();
            // lookup the product specified by the QBE

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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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Related Classes of org.apache.ojb.broker.query.QueryByIdentity

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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