Examples of org.odmg.DCollection

org.odmg.DCollection
The base interface for all ODMG collections. The ODMG collections are based on JavaSoft�s collection interfaces. All of the operations defined by the JavaSoft Collection interface are supported by an ODMG implementation of DCollection; the exception UnsupportedOperationException is not thrown when a call is made to any of the Collection methods.
DCollection contains methods used to perform queries on the collection. The OQL query predicate is given as a string with the syntax of the where clause of OQL. The predefined OQL variable this is used inside the predicate to denote the current element of the collection. @author David Jordan (as Java Editor of the Object Data Management Group) @version ODMG 3.0

        {
            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create("select aLotOfArticles from " + Article.class.getName() + " where productGroupId = 4");


            DCollection results = (DCollection) query.execute();
            results = results.query("price > 35");


            // now perform control query
            query = odmg.newOQLQuery();
            query.create(
                    "select aLotOfArticles from "
                    + Article.class.getName()
                    + " where productGroupId = 4 and price  > 35");


            DCollection check = (DCollection) query.execute();


            assertEquals(results, check);


            tx.commit();
        }

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        {
            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create("select aLotOfArticles from " + Article.class.getName() + " where productGroupId = 4");


            DCollection results = (DCollection) query.execute();
            results = results.query("price > 35");


            // now perform control query
            query = odmg.newOQLQuery();
            query.create(
                    "select aLotOfArticles from "
                    + Article.class.getName()
                    + " where productGroupId = 4 and price  > 35");


            DCollection check = (DCollection) query.execute();


            assertEquals(results, check);


            tx.commit();
        }

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        {
            tx.begin();
            OQLQuery query = odmg.newOQLQuery();
            query.create("select aLotOfArticles from " + Article.class.getName() + " where productGroupId = 4");


            DCollection results = (DCollection) query.execute();
            results = results.query("price > 35");


            // now perform control query
            query = odmg.newOQLQuery();
            query.create(
                    "select aLotOfArticles from "
                    + Article.class.getName()
                    + " where productGroupId = 4 and price  > 35");


            DCollection check = (DCollection) query.execute();


            assertEquals(results, check);


            tx.commit();
        }

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org.apache.ojb.odmg.OdmgExamples

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