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

     * Returns default Cayenne DataContext associated with the HttpSession, creating it on
     * the fly and storing in the session if needed.
     */
    public static DataContext getSessionContext(HttpSession session) {
        synchronized (session) {
            DataContext ctxt = (DataContext) session.getAttribute(DATA_CONTEXT_KEY);


            if (ctxt == null) {
                ctxt = DataContext.createDataContext();
                session.setAttribute(ServletUtil.DATA_CONTEXT_KEY, ctxt);
            }

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     * Returns default Cayenne DataContext associated with the HttpSession, creating it on
     * the fly and storing in the session if needed.
     */
    public static DataContext getSessionContext(HttpSession session) {
        synchronized (session) {
            DataContext ctxt = (DataContext) session.getAttribute(DATA_CONTEXT_KEY);


            if (ctxt == null) {
                ctxt = DataContext.createDataContext();
                session.setAttribute(ServletUtil.DATA_CONTEXT_KEY, ctxt);
            }

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        if (request instanceof HttpServletRequest) {
            reset = true;


            HttpSession session = ((HttpServletRequest) request).getSession(true);
            DataContext context = ServletUtil.getSessionContext(session);
            DataContext.bindThreadDataContext(context);
        }


        try {
            chain.doFilter(request, response);

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            return;
        }


        createTestData("testDistinctClobFetch");


        DataContext context = createDataContext();


        SelectQuery noDistinct = new SelectQuery(ClobMaster.class);
        noDistinct.addOrdering(ClobMaster.NAME_PROPERTY, true);


        SelectQuery distinct = new SelectQuery(ClobMaster.class);
        distinct.setDistinct(true);
        distinct.addOrdering(ClobMaster.NAME_PROPERTY, true);


        List noDistinctResult = context.performQuery(noDistinct);
        List distinctResult = context.performQuery(distinct);


        assertEquals(3, noDistinctResult.size());
        assertEquals(noDistinctResult, distinctResult);
    }

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            return;
        }


        createTestData("testDistinctClobFetchWithToManyJoin");


        DataContext context = createDataContext();


        Expression qual = Expression.fromString("details.name like 'cd%'");
        SelectQuery query = new SelectQuery(ClobMaster.class, qual);
        List result = context.performQuery(query);


        assertEquals(3, result.size());
    }

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        deleteTestData();
    }


    public void testCAY_207Super1() throws Exception {
        createTestData("testCAY_207");
        DataContext context = createDataContext();


        prepare();


        try {
            // M1

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        }
    }


    public void testCAY_207Super2() throws Exception {
        createTestData("testCAY_207");
        DataContext context = createDataContext();


        prepare();


        try {
//            Manager o2 = DataObjectUtils.objectForPK(context, Manager.class, 2);

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        }
    }


    public void testCAY_207Subclass1() throws Exception {
        createTestData("testCAY_207");
        DataContext context = createDataContext();


        prepare();


        try {
            // M1

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        }
    }


    public void testCAY_207Subclass2() throws Exception {
        createTestData("testCAY_207");
        DataContext context = createDataContext();


        prepare();


        try {
//            Manager o2 = DataObjectUtils.objectForPK(context, CAY_207Manager2.class, 2);

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            cleanup(context);
        }
    }


    public void testCAY_207Save() throws Exception {
        DataContext context = createDataContext();


        prepare();


        try {
//            CAY_207Manager2 o2 = context.newObject(CAY_207Manager2.class);

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org.apache.cayenne.access.event.DataContextEvent

org.apache.cayenne.access.jdbc.SoftDeleteBatchQueryBuilderTest

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