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

        artist.validateForSave(result);
        assertFalse(result.hasFailures());
    }


    public void testValidateForSaveAttributeTooLong() throws Exception {
        DataContext context = createDataContext();
        Artist artist = (Artist) context.newObject("Artist");


        DbEntity entity = context.getEntityResolver().lookupObjEntity(artist).getDbEntity();
        int len = ((DbAttribute) entity.getAttribute("ARTIST_NAME")).getMaxLength();
        StringBuffer buf = new StringBuffer(len);
        for (int i = 0; i < len + 1; i++) {
            buf.append("c");
        }

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import org.apache.cayenne.testdo.testmap.Artist;
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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        oatr1.setType("java.lang.String");
        objEntity.addAttribute(oatr1);
        map.addObjEntity(objEntity);


        // try to insert some rows to check that pk stuff is working
        DataContext ctxt = createDataContext();
        DataMap sourceMap = map;//ctxt.getEntityResolver().getDataMap("testmap");


        try {
            sourceMap.addDbEntity(dbEntity);
            sourceMap.addObjEntity(objEntity);


            for (int i = 0; i < 5; i++) {
                CayenneDataObject dao = (CayenneDataObject) ctxt.newObject(objEntity
                        .getName());
                dao.writeProperty(oatr1.getName(), "test " + i);
            }
            ctxt.commitChanges();
        }
        finally {
            sourceMap.removeObjEntity(objEntity.getName(), true);
            sourceMap.removeDbEntity(dbEntity.getName(), true);
        }


        // clear up
        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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        artistDbEntity.addRelationship(r2);


        assertTokensAndExecute(node, map, 2, 0);
        assertTokensAndExecute(node, map, 0, 0);


        DataContext ctxt = createDataContext();


        // remove relationships
        dbEntity.removeRelationship(r1.getName());
        artistDbEntity.removeRelationship(r2.getName());
        ctxt.getEntityResolver().clearCache();
        assertTokensAndExecute(node, map, 1, 1);
        assertTokensAndExecute(node, map, 0, 0);


        // clear up
        // 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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        artistDbEntity.addRelationship(r2);


        assertTokensAndExecute(node, map, 1, 0);
        assertTokensAndExecute(node, map, 0, 0);


        DataContext ctxt = createDataContext();


        // remove relationships
        dbEntity.removeRelationship(r1.getName());
        artistDbEntity.removeRelationship(r2.getName());
        ctxt.getEntityResolver().clearCache();
        assertTokensAndExecute(node, map, 1, 1);
        assertTokensAndExecute(node, map, 0, 0);


        // clear up
        // 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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        assertTrue(token instanceof AddColumnToModel);
        execute(token);
        assertEquals(1, objEntity.getAttributes().size());
        assertEquals("java.lang.String", objEntity.getAttributes().iterator().next().getType());


        DataContext ctxt = createDataContext();


        // clear up
        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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        assertTrue(token instanceof DropTableToModel);
        execute(token);
        assertNull(map.getDbEntity(dbEntity.getName()));
        assertNull(map.getObjEntity(objEntity.getName()));


        DataContext ctxt = createDataContext();


        // clear up
        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, 0, 0);

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// partial solution
public class CDOOneToManyFKTest extends RelationshipCase {


    public void testReadRelationship() throws Exception {
        deleteTestData();
        DataContext context = createDataContext();


        ToManyRoot2 src2 = context.newObject(ToManyRoot2.class);
        ToManyFkRoot src = context.newObject(ToManyFkRoot.class);


        // this should go away when such mapping becomes fully supported
        src.setDepId(new Integer(1));
        ToManyFkDep target = context.newObject(ToManyFkDep.class);


        // this should go away when such mapping becomes fully supported
        target.setDepId(new Integer(1));
        target.setRoot2(src2);


        src.addToDeps(target);
        context.commitChanges();


        context.invalidateObjects(Arrays.asList(src, target, src2));


        ToManyFkRoot src1 = (ToManyFkRoot) Cayenne.objectForPK(context, src
                .getObjectId());
        assertNotNull(src1.getDeps());
        assertEquals(1, src1.getDeps().size());
        // resolve HOLLOW
        assertSame(src1, ((ToManyFkDep) src1.getDeps().get(0)).getRoot());


        context.invalidateObjects(Arrays.asList(src1, src1.getDeps().get(0)));


        ToManyFkDep target2 = (ToManyFkDep) Cayenne.objectForPK(context, target
                .getObjectId());
        assertNotNull(target2.getRoot());

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        super.setUp();
        deleteTestData();
    }


    public void testReadFlattenedRelationship() throws Exception {
        DataContext context = createDataContext();


        createTestData("testReadFlattenedRelationship");
        Artist a1 = Cayenne.objectForPK(context, Artist.class, 33001);
        List groupList = a1.getGroupArray();
        assertNotNull(groupList);

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        assertNotNull(groupList);
        assertEquals(0, groupList.size());
    }


    public void testReadFlattenedRelationship2() throws Exception {
        DataContext context = createDataContext();


        createTestData("testReadFlattenedRelationship2");


        Artist a1 = Cayenne.objectForPK(context, Artist.class, 33001);
        List groupList = a1.getGroupArray();

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Related Classes of org.apache.cayenne.access.DataContext

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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