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

            String getterName = ClickUtils.toGetterName(getName());


            try {
                Method method = doClass.getMethod(getterName);


                DataContext dataContext = form.getDataContext();


                Class propertyClass = method.getReturnType();


                String propertyPk = getValue();

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        // Select option value if value defined and not form submission
        if (getValueObject() == null && !getForm().isFormSubmission()) {


            CayenneForm form = (CayenneForm) getForm();
            DataContext dataContext = form.getDataContext();
            Class doClass = form.getDataObjectClass();
            Object doPk = form.getDataObjectPk();


            if (doPk != null) {
                DataObject dataObject =

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            // Don't load list
            return;
        }


        CayenneForm form = (CayenneForm) getForm();
        DataContext dataContext = form.getDataContext();


        try {
            List list = null;


            if (getSelectQuery() != null) {
                SelectQuery query = getSelectQuery();


                if (!query.getOrderings().isEmpty()) {
                    orderingApplied = true;


                } else if (getOrdering() != null && !orderingApplied) {
                    query.addOrdering(getOrdering());
                    orderingApplied = true;


                } else if (getOptionLabel() != null && !orderingApplied) {
                    query.addOrdering(getOptionLabel(), true);
                    orderingApplied = true;
                }


                list = dataContext.performQuery(query);


            } else if (getNamedQuery() != null) {
                list = dataContext.performQuery(getNamedQuery());


            } else if (getQueryName() != null) {
                 list = dataContext.performQuery(getQueryName(), false);


            } else {
                Class doClass = form.getDataObjectClass();
                String getterName = ClickUtils.toGetterName(getName());
                Method method = doClass.getMethod(getterName);
                Class propertyClass = method.getReturnType();


                SelectQuery query = new SelectQuery(propertyClass);


                if (getOrdering() != null && !orderingApplied) {
                    query.addOrdering(getOrdering());
                    orderingApplied = true;


                } else if (getOptionLabel() != null && !orderingApplied) {
                    query.addOrdering(getOptionLabel(), true);
                    orderingApplied = true;
                }


                list = dataContext.performQuery(query);
            }


            if (isRequired() && getOptionList().isEmpty() || isOptional()) {
                getOptionList().add(Option.EMPTY_OPTION);
            }

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    protected DataContext getDataContext() {
        try {
            return (DataContext) BaseContext.getThreadObjectContext();


        } catch (IllegalStateException ise) {
            DataContext dataContext = DataContext.createDataContext();
            BaseContext.bindThreadObjectContext(dataContext);
            return dataContext;
        }
    }

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            if (getDomain().getQueryCache() != null) {
                getDomain().getQueryCache().clear();
            }
        }
        DataContext context = getDomain().createDataContext(true);


        assertSame(getDomain().getSharedSnapshotCache(), context
                .getObjectStore()
                .getDataRowCache());


        return context;
    }

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    /**
     * Creates a DataContext that uses local snapshot cache and is based on default test
     * domain.
     */
    protected DataContext createDataContextWithDedicatedCache() {
        DataContext context = getDomain().createDataContext(false);


        assertNotSame(getDomain().getSharedSnapshotCache(), context
                .getObjectStore()
                .getDataRowCache());


        return context;
    }

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                .getAttributes()
                .iterator()
                .next()
                .getType());


        DataContext ctxt = createDataContext();


        // clear up
        // fix psql case issue
        map.removeDbEntity(objEntity.getDbEntity().getName(), true);
        map.removeObjEntity(objEntity.getName(), true);
        map.removeDbEntity(dbEntity.getName(), true);
        ctxt.getEntityResolver().clearCache();
        assertNull(map.getObjEntity(objEntity.getName()));
        assertNull(map.getDbEntity(dbEntity.getName()));
        assertFalse(map.getDbEntities().contains(dbEntity));


        assertTokensAndExecute(node, map, 1, 0);

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    public void testConflictingField1() throws Exception {
        deleteTestData();
        createTestData("testConflictingField");


        DataContext c = createDataContext();
        MixedPersistenceStrategy object = Cayenne.objectForPK(
                c,
                MixedPersistenceStrategy.class,
                1);

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     */
    public void testConflictingField2() throws Exception {
        deleteTestData();
        createTestData("testConflictingField");


        DataContext c = createDataContext();
        MixedPersistenceStrategy2 detail1 = Cayenne.objectForPK(
                c,
                MixedPersistenceStrategy2.class,
                1);

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        assertEquals(0, dbEntity2.getRelationships().size());
        assertEquals(0, objEntity1.getRelationships().size());
        assertEquals(0, objEntity2.getRelationships().size());


        // clear up
        DataContext ctxt = createDataContext();
        dbEntity1.removeRelationship(rel1To2.getName());
        dbEntity2.removeRelationship(rel2To1.getName());
        map.removeObjEntity(objEntity1.getName(), true);
        map.removeDbEntity(dbEntity1.getName(), true);
        map.removeObjEntity(objEntity2.getName(), true);
        map.removeDbEntity(dbEntity2.getName(), true);
        ctxt.getEntityResolver().clearCache();
        assertNull(map.getObjEntity(objEntity1.getName()));
        assertNull(map.getDbEntity(dbEntity1.getName()));
        assertNull(map.getObjEntity(objEntity2.getName()));
        assertNull(map.getDbEntity(dbEntity2.getName()));
        assertFalse(map.getDbEntities().contains(dbEntity1));

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org.apache.cayenne.access.event.DataContextEvent

org.apache.cayenne.access.jdbc.SoftDeleteBatchQueryBuilderTest

org.apache.cayenne.access.util.BatchQueryUtils

org.apache.cayenne.access.util.IteratedSelectObserver

org.apache.cayenne.cache.NestedQueryCache

org.apache.cayenne.CayenneContextEJBQLTest

org.apache.cayenne.CayenneContextWithDataContextTest

org.apache.cayenne.CayenneDataObjectFlattenedRelTest

org.apache.cayenne.CayenneDataObjectInCtxtTest

org.apache.cayenne.CayenneDataObjectRelTest

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