Package org.apache.cayenne.query

Examples of org.apache.cayenne.query.QueryMetadata

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                .getClassDescriptor("Artist");
        List dataRows = new ArrayList();
        dataRows.add(new DataRow(4));
        dataRows.add(new DataRow(4));

        QueryMetadata metadata = new MockQueryMetadata() {

            @Override
            public ClassDescriptor getClassDescriptor() {
                return descriptor;
            }
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                        + Painting.TO_GALLERY_PROPERTY
                        + "."
                        + Gallery.EXHIBIT_ARRAY_PROPERTY).setPhantom(false);
        tree.addPath(Artist.ARTIST_EXHIBIT_ARRAY_PROPERTY).setPhantom(false);

        QueryMetadata metadata = new MockQueryMetadata() {

            @Override
            public ClassDescriptor getClassDescriptor() {
                return descriptor;
            }
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        // (assuming all lists are mutable)

        if (context != null) {

            EntityResolver resolver = context.getEntityResolver();
            QueryMetadata info = query.getMetaData(resolver);

            if (!info.isFetchingDataRows()) {

                response.reset();

                while (response.next()) {
                    if (response.isList()) {

                        List objects = response.currentList();

                        if (!objects.isEmpty()) {

                            DeepMergeOperation merger = new DeepMergeOperation(context);
                            List<Object> rsMapping = info.getResultSetMapping();
                            if (rsMapping == null) {
                                convertSingleObjects(resolver, objects, merger);
                            }
                            else {
                                if (rsMapping.size() == 1) {
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            engine.addExpectedResult(select, rows1);
            List resultRows = context.performQuery(select);
            assertEquals(1, engine.getRunCount());
            assertEquals(rows1, resultRows);

            QueryMetadata cacheKey = select.getMetaData(context.getEntityResolver());
            assertNull(context.getParentDataDomain().getQueryCache().get(cacheKey));

            assertEquals(rows1, context.getQueryCache().get(cacheKey));

            // second run, must refresh the cache
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            engine.addExpectedResult(select, rows1);
            List resultRows = context.performQuery(select);
            assertEquals(1, engine.getRunCount());
            assertEquals(rows1, resultRows);

            QueryMetadata cacheKey = select.getMetaData(context.getEntityResolver());

            assertEquals(rows1, context.getParentDataDomain().getQueryCache().get(
                    cacheKey));

            assertNull(context.getQueryCache().get(cacheKey));
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            engine.addExpectedResult(select, rows1);
            List resultRows = context.performQuery(select);
            assertEquals(1, engine.getRunCount());
            assertEquals(2, resultRows.size());
            assertTrue(resultRows.get(0) instanceof DataObject);
            QueryMetadata cacheKey = select.getMetaData(context.getEntityResolver());
            assertNull(context.getParentDataDomain().getQueryCache().get(cacheKey));

            assertEquals(resultRows, context.getQueryCache().get(cacheKey));

            // second run, must refresh the cache
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     *
     * @deprecated Since 1.2. This is a utility method that handles a very specific case.
     *             It shouldn't be in DataContext.
     */
    public void prefetchRelationships(SelectQuery query, List objects) {
        QueryMetadata metadata = query.getMetaData(getEntityResolver());
        Collection prefetches = metadata.getPrefetchTree() != null ? query
                .getPrefetchTree()
                .nonPhantomNodes() : Collections.EMPTY_LIST;

        if (objects == null || objects.size() == 0 || prefetches.size() == 0) {
            return;
        }

        ObjEntity entity = metadata.getObjEntity();
        Iterator prefetchesIt = prefetches.iterator();
        while (prefetchesIt.hasNext()) {
            PrefetchTreeNode prefetch = (PrefetchTreeNode) prefetchesIt.next();
            String path = prefetch.getPath();
            if (path.indexOf('.') >= 0) {
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    @Override
    public String createSqlString() throws Exception {

        String sqlString = super.createSqlString();

        QueryMetadata info = getQuery().getMetaData(getEntityResolver());
        if (info.getFetchLimit() > 0) {
            sqlString = "SELECT * FROM ("
                    + sqlString
                    + ") WHERE rownum <= "
                    + info.getFetchLimit();
        }

        return sqlString;
    }
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*/
class HSQLSelectTranslator extends SelectTranslator {

    @Override
    protected void appendLimitAndOffsetClauses(StringBuilder buffer) {
        QueryMetadata metadata = getQuery().getMetaData(getEntityResolver());
        int offset = metadata.getFetchOffset();
        int limit = metadata.getFetchLimit();

        if (offset > 0 || limit > 0) {
            buffer.append(" LIMIT ");

            // both OFFSET and LIMIT must be present, so come up with defaults if one of
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        });

        SQLTemplate sqlQuery = context.getQuery();

        // update with metadata
        QueryMetadata md = query.getMetaData(getEntityResolver());
        sqlQuery.setFetchLimit(md.getFetchLimit());
        sqlQuery.setFetchOffset(md.getFetchOffset());

        actionFactory.sqlAction(sqlQuery).performAction(connection, observer);
    }
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Related Classes of org.apache.cayenne.query.QueryMetadata

  • org.apache.cayenne.access.DataContext
  • org.apache.cayenne.access.DataContextQueryCachingTest
  • org.apache.cayenne.access.DataContextTest
  • org.apache.cayenne.access.IncrementalFaultList
  • org.apache.cayenne.access.jdbc.BaseSQLAction
  • org.apache.cayenne.access.jdbc.EJBQLAction
  • org.apache.cayenne.access.jdbc.SelectAction
  • org.apache.cayenne.access.PrefetchProcessorTreeBuilderTest
  • org.apache.cayenne.access.select.EntityTreeSegmentBuilderTest
  • org.apache.cayenne.access.util.SelectObserver
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