Examples of org.apache.cayenne.access.DataContext

org.apache.cayenne.access.DataContext
Class that provides applications with access to Cayenne persistence features. In most cases this is the only access class directly used in the application.
Most common DataContext use pattern is to create one DataContext per session. "Session" may be a an HttpSession in a web application, or any other similar concept in a multiuser application.

DataObjects are registered with DataContext either implicitly when they are fetched via a query, or read via a relationship from another object, or explicitly via calling {@link #createAndRegisterNewObject(Class)}during new DataObject creation. DataContext tracks changes made to its DataObjects in memory, and flushes them to the database when {@link #commitChanges()}is called. Until DataContext is committed, changes made to its objects are not visible in other DataContexts.

Each DataObject can belong only to a single DataContext. To create a replica of an object from a different DataContext in a local context, use {@link #localObject(ObjectId,Persistent)} method.
For more information see Cayenne User Guide.

Note that all QueryEngine interface methods are deprecated in the DataContext. Since 1.2 release DataContext implements ObjectContext and DataChannel interfaces.
@author Andrus Adamchik

        // create the FK constraint...


        deleteTestData();
        createTestData("testResolveToOneOverFKOfDifferentNumType");


        DataContext context = createDataContext();
        FkOfDifferentType root = DataObjectUtils.objectForPK(
                context,
                FkOfDifferentType.class,
                1);

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        return CayenneResources.getResources().getAccessStack("InheritanceFlatStack");
    }


    public void testGroupActions() throws Exception {


        DataContext context = createDataContext();


        User user = context.newObject(User.class);
        user.setName("test_user");


        Group group1 = context.newObject(Group.class);
        group1.setName("test_group1");


        Group group2 = context.newObject(Group.class);
        group2.setName("test_group2");


        group1.addToGroupMembers(user);
        group2.addToGroupMembers(group1);


        group2.getObjectContext().commitChanges();


        // Per CAY-1379 removing user and then refetching resulted in a FFE downstream
        group1.removeFromGroupMembers(user);
        Expression exp = ExpressionFactory.matchExp(Role.ROLE_GROUPS_PROPERTY, group2);
        SelectQuery query = new SelectQuery(Group.class, exp);
        context.performQuery(query);
        context.commitChanges();


        context.deleteObject(group1);
        context.deleteObject(group2);
        context.deleteObject(user);
        context.commitChanges();
    }

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import org.apache.cayenne.query.SelectQueryBase;


public class CAY_788Test extends SelectQueryBase {


    public void testPrefetchToOne() {
        DataContext ctxt = createDataContext();
        SelectQuery query = new SelectQuery(Painting.class);
        query.addPrefetch(Painting.TO_PAINTING_INFO_PROPERTY);
        List daos = ctxt.performQuery(query);
        assertTrue(!daos.isEmpty());
        for (Iterator it = daos.iterator(); it.hasNext();) {
            Painting p = (Painting) it.next();
            PaintingInfo pi = p.getToPaintingInfo();
            assertEquals("persistence state", PersistenceState.COMMITTED, p

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        }
    }


    @Override
    protected void populateTables() throws Exception {
        DataContext ctxt = createDataContext();
        for (int i = 0; i < 10; i++) {
            Painting p = ctxt.newObject(Painting.class);
            p.setPaintingTitle("Painting title #" + i);
            p.setPaintingDescription("Painting desc #" + i);
            PaintingInfo pi = ctxt.newObject(PaintingInfo.class);
            pi.setTextReview("Review #" + i);
            p.setToPaintingInfo(pi);
        }
        ctxt.commitChanges();
    }

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        return CayenneResources.getResources().getAccessStack("InheritanceFlatStack");
    }


    public void testFlattenedNullifyNullifyDeleteRules() throws Exception {


        DataContext context = createDataContext();


        User user = context.newObject(User.class);
        user.setName("test_user");
        Group group = context.newObject(Group.class);
        group.setName("test_group");
        group.addToGroupMembers(user);
        context.commitChanges();


        context.deleteObject(user);
        assertTrue(group.getGroupMembers().isEmpty());


        context.commitChanges();


        // here Cayenne would throw per CAY-1378 on an attempt to delete a previously
        // related transient object
        context.deleteObject(group);
        context.commitChanges();
    }

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    public void testCacheStrategy() throws Exception {
        deleteTestData();


        insertValue();
        DataContext contex = createDataContext();
        String ejbql = "select a FROM Artist a";
        EJBQLQuery query = new EJBQLQuery(ejbql);
        query.setCacheStrategy(QueryCacheStrategy.LOCAL_CACHE);
        List<Artist> artist1 = contex.performQuery(query);
        blockQueries();
        List<Artist> artist2;
        try {
            EJBQLQuery query1 = new EJBQLQuery(ejbql);
            query1.setCacheStrategy(QueryCacheStrategy.LOCAL_CACHE);
            artist2 = contex.performQuery(query1);
        }
        finally {
            unblockQueries();
        }

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                true);
        assertEquals(artistName, artist.getArtistName());
    }


    private void insertValue() {
        DataContext context = createDataContext();


        for (int i = 0; i < 5; i++) {
            Artist obj = context.newObject(Artist.class);
            obj.setArtistName("a" + i);
            context.commitChanges();
        }
    }

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            context.commitChanges();
        }
    }


    private void insertPaintValue() {
        DataContext context = createDataContext();


        for (int i = 0; i < 2; i++) {
            Artist art = context.newObject(Artist.class);
            art.setArtistName("a" + i);
            Painting obj = context.newObject(Painting.class);
            obj.setToArtist(art);
            obj.setPaintingTitle("title" + i);
            context.commitChanges();
        }
    }

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    }


    public void testSelectRelationship() {


        insertPaintValue();
        DataContext contex = createDataContext();
        
        String ejbql = "SELECT p.toArtist FROM Painting p"; 
        EJBQLQuery query = new EJBQLQuery(ejbql);


        List result = contex.performQuery(query);


        assertNotNull(result);
        assertEquals(2, result.size());


        assertEquals(Artist.class, result.get(0).getClass());


        
        String ejbql2 = "SELECT p.toArtist, p FROM Painting p"; 
        EJBQLQuery query2 = new EJBQLQuery(ejbql2);


        List result2 = contex.performQuery(query2);


        assertNotNull(result2);
        assertEquals(2, result2.size());
        assertEquals(2, ((Object[])result2.get(0)).length);
        
        assertEquals(Artist.class,((Object[])result2.get(0))[0].getClass());
        assertEquals(Painting.class,((Object[])result2.get(0))[1].getClass());
        
        String ejbql3 = "SELECT p.toArtist, p.paintingTitle FROM Painting p"; 
        EJBQLQuery query3 = new EJBQLQuery(ejbql3);


        List result3 = contex.performQuery(query3);


        assertNotNull(result3);
        assertEquals(2, result3.size());
        assertEquals(2, ((Object[])result3.get(0)).length);

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import org.apache.cayenne.access.DataContext;
import org.apache.cayenne.unit.CayenneCase;


public class StatementFetchSizeTest extends CayenneCase {
    public void test() {
        DataContext dataContext = createDataContext();
        
        SelectQuery query = new SelectQuery(Artist.class);
        query.setStatementFetchSize(10);
        
        assertEquals(10, query.getMetaData(dataContext.getEntityResolver()).getStatementFetchSize());
        dataContext.performQuery(query);
        
        SQLTemplate template = new SQLTemplate(Artist.class, "SELECT ARTIST_ID FROM ARTIST");
        template.setStatementFetchSize(10);
        
        assertEquals(10, template.getMetaData(dataContext.getEntityResolver()).getStatementFetchSize());
        dataContext.performQuery(template);
        
        EJBQLQuery ejbql = new EJBQLQuery("select a from Artist a");
        ejbql.setStatementFetchSize(10);
        
        assertEquals(10, ejbql.getMetaData(dataContext.getEntityResolver()).getStatementFetchSize());
        dataContext.performQuery(ejbql);
        
        ObjectId id = new ObjectId("Artist", Artist.ARTIST_ID_PK_COLUMN, 1);
        RelationshipQuery relationshipQuery = new RelationshipQuery(id, Artist.PAINTING_ARRAY_PROPERTY, true);
        relationshipQuery.setStatementFetchSize(10);
        
        assertEquals(10, relationshipQuery.getMetaData(dataContext.getEntityResolver()).getStatementFetchSize());
        dataContext.performQuery(relationshipQuery);
    }

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