Examples with Item org.jpwh.model.querying.Item used on opensource projects

Example 6 with Item

use of org.jpwh.model.querying.Item in project microservices by pwillhan.

the class Grouping method executeQueries.

@Test
public void executeQueries() throws Exception {
    storeTestData();
    CriteriaBuilder cb = JPA.getEntityManagerFactory().getCriteriaBuilder();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        {
            // Group
            CriteriaQuery criteria = cb.createQuery();
            Root<User> u = criteria.from(User.class);
            criteria.multiselect(u.get("lastname"), cb.count(u));
            criteria.groupBy(u.get("lastname"));
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 2);
            for (Object[] row : result) {
                assertTrue(row[0] instanceof String);
                assertTrue(row[1] instanceof Long);
            }
        }
        em.clear();
        {
            // Average
            CriteriaQuery criteria = cb.createQuery();
            Root<Bid> b = criteria.from(Bid.class);
            criteria.multiselect(b.get("item").get("name"), cb.avg(b.<BigDecimal>get("amount")));
            criteria.groupBy(b.get("item").get("name"));
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 2);
            for (Object[] row : result) {
                assertTrue(row[0] instanceof String);
                assertTrue(row[1] instanceof Double);
            }
        }
        em.clear();
        {
            // Average Workaround
            CriteriaQuery criteria = cb.createQuery();
            Root<Bid> b = criteria.from(Bid.class);
            Join<Bid, Item> i = b.join("item");
            criteria.multiselect(i, cb.avg(b.<BigDecimal>get("amount")));
            criteria.groupBy(i.get("id"), i.get("name"), i.get("createdOn"), i.get("auctionEnd"), i.get("auctionType"), i.get("approved"), i.get("buyNowPrice"), i.get("seller"));
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 2);
            for (Object[] row : result) {
                assertTrue(row[0] instanceof Item);
                assertTrue(row[1] instanceof Double);
            }
        }
        em.clear();
        {
            // Having
            CriteriaQuery criteria = cb.createQuery();
            Root<User> u = criteria.from(User.class);
            criteria.multiselect(u.get("lastname"), cb.count(u));
            criteria.groupBy(u.get("lastname"));
            criteria.having(cb.like(u.<String>get("lastname"), "D%"));
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 1);
            for (Object[] row : result) {
                assertTrue(row[0] instanceof String);
                assertTrue(row[1] instanceof Long);
            }
        }
        em.clear();
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}

Example 7 with Item

use of org.jpwh.model.querying.Item in project microservices by pwillhan.

the class Joins method executeQueries.

@Test
public void executeQueries() throws Exception {
    TestDataCategoriesItems testData = storeTestData();
    CriteriaBuilder cb = JPA.getEntityManagerFactory().getCriteriaBuilder();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        {
            // Implicit inner join
            CriteriaQuery criteria = cb.createQuery();
            Root<Bid> b = criteria.from(Bid.class);
            criteria.select(b).where(cb.like(b.get("item").<String>get("name"), "Fo%"));
            Query q = em.createQuery(criteria);
            List<Bid> result = q.getResultList();
            assertEquals(result.size(), 3);
            for (Bid bid : result) {
                assertEquals(bid.getItem().getId(), testData.items.getFirstId());
            }
        }
        em.clear();
        {
            // Multiple inner
            CriteriaQuery<Bid> criteria = cb.createQuery(Bid.class);
            Root<Bid> b = criteria.from(Bid.class);
            criteria.select(b).where(cb.equal(b.get("item").get("seller").get("username"), "johndoe"));
            Query q = em.createQuery(criteria);
            List<Bid> result = q.getResultList();
            assertEquals(result.size(), 4);
        }
        em.clear();
        {
            // Multiple inner
            CriteriaQuery criteria = cb.createQuery();
            Root<Bid> b = criteria.from(Bid.class);
            criteria.select(b).where(cb.and(cb.equal(b.get("item").get("seller").get("username"), "johndoe"), cb.isNotNull(b.get("item").get("buyNowPrice"))));
            Query q = em.createQuery(criteria);
            List<Bid> result = q.getResultList();
            assertEquals(result.size(), 3);
        }
        em.clear();
        {
            // Explicit inner
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            Join<Item, Bid> b = i.join("bids");
            criteria.select(i).where(cb.gt(b.<BigDecimal>get("amount"), new BigDecimal(100)));
            Query q = em.createQuery(criteria);
            List<Item> result = q.getResultList();
            assertEquals(result.size(), 1);
            assertEquals(result.get(0).getId(), testData.items.getFirstId());
        }
        em.clear();
        {
            // Explicit outer
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            Join<Item, Bid> b = i.join("bids", JoinType.LEFT);
            b.on(cb.gt(b.<BigDecimal>get("amount"), new BigDecimal(100)));
            criteria.multiselect(i, b);
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 3);
            assertTrue(result.get(0)[0] instanceof Item);
            assertTrue(result.get(0)[1] instanceof Bid);
            assertTrue(result.get(1)[0] instanceof Item);
            assertEquals(result.get(1)[1], null);
            assertTrue(result.get(2)[0] instanceof Item);
            assertEquals(result.get(2)[1], null);
        }
        em.clear();
        {
        // Explicit right outer
        /* TODO Right outer joins not supported in criteria, Hibernate bug JPA-2

                CriteriaQuery criteria = cb.createQuery();
                Root<Bid> b = criteria.from(Bid.class);
                Join<Bid, Item> i = b.join("item", JoinType.RIGHT);
                criteria.multiselect(b, i).where(
                   cb.or(
                      cb.isNull(b),
                      cb.gt(b.<BigDecimal>get("amount"), new BigDecimal(100)))
                );

                Query q = em.createQuery(criteria);
                List<Object[]> result = q.getResultList();
                assertEquals(result.size(), 2);
                assertTrue(result.get(0)[0] instanceof Bid);
                assertTrue(result.get(0)[1] instanceof Item);
                assertEquals(result.get(1)[0], null);
                assertTrue(result.get(1)[1] instanceof Item);
                */
        }
        em.clear();
        {
            // A typical "fetch the bids collections for all items as a side effect" query
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            i.fetch("bids", JoinType.LEFT);
            criteria.select(i);
            Query q = em.createQuery(criteria);
            List<Item> result = q.getResultList();
            // 3 items, 4 bids, 5 "rows" in result!
            assertEquals(result.size(), 5);
            // In-memory "distinct"
            Set<Item> distinctResult = new LinkedHashSet<Item>(result);
            // It was only three items all along...
            assertEquals(distinctResult.size(), 3);
            boolean haveBids = false;
            for (Item item : distinctResult) {
                // No more lazy loading!
                em.detach(item);
                if (item.getBids().size() > 0) {
                    haveBids = true;
                    break;
                }
            }
            assertTrue(haveBids);
        }
        em.clear();
        {
            // Hibernate can remove the duplicate SQL resultset rows for you
            // (...who knows, some of you actually WANT the duplicates!)
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            i.fetch("bids", JoinType.LEFT);
            criteria.select(i).distinct(true);
            Query q = em.createQuery(criteria);
            List<Item> result = q.getResultList();
            // Hibernate filtered it for us in-memory
            assertEquals(result.size(), 3);
            boolean haveBids = false;
            for (Item item : result) {
                // No more lazy loading!
                em.detach(item);
                if (item.getBids().size() > 0) {
                    haveBids = true;
                    break;
                }
            }
            assertTrue(haveBids);
        }
        em.clear();
        {
            // Fetch multiple associated instances/collections
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            Fetch<Item, Bid> b = i.fetch("bids", JoinType.LEFT);
            // These are non-nullable foreign key columns, inner join or
            b.fetch("bidder");
            // outer doesn't make a difference!
            i.fetch("seller", JoinType.LEFT);
            criteria.select(i).distinct(true);
            Query q = em.createQuery(criteria);
            List<Item> result = q.getResultList();
            assertEquals(result.size(), 2);
            boolean haveBids = false;
            boolean haveBidder = false;
            boolean haveSeller = false;
            for (Item item : result) {
                // No more lazy loading!
                em.detach(item);
                if (item.getBids().size() > 0) {
                    haveBids = true;
                    Bid bid = item.getBids().iterator().next();
                    if (bid.getBidder() != null && bid.getBidder().getUsername() != null) {
                        haveBidder = true;
                    }
                }
                if (item.getSeller() != null && item.getSeller().getUsername() != null)
                    haveSeller = true;
            }
            assertTrue(haveBids);
            assertTrue(haveBidder);
            assertTrue(haveSeller);
        }
        em.clear();
        {
            // SQL Cartesian product of multiple collections! Bad!
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            i.fetch("bids", JoinType.LEFT);
            // Cartesian product, bad!
            i.fetch("images", JoinType.LEFT);
            criteria.select(i).distinct(true);
            Query q = em.createQuery(criteria);
            List<Item> result = q.getResultList();
            assertEquals(result.size(), 3);
            boolean haveBids = false;
            boolean haveImages = false;
            for (Item item : result) {
                // No more lazy loading!
                em.detach(item);
                if (item.getBids().size() > 0)
                    haveBids = true;
                if (item.getImages().size() > 0)
                    haveImages = true;
            }
            assertTrue(haveBids);
            assertTrue(haveImages);
        }
        em.clear();
        {
            // Theta style inner join
            CriteriaQuery criteria = cb.createQuery();
            Root<User> u = criteria.from(User.class);
            Root<LogRecord> log = criteria.from(LogRecord.class);
            criteria.where(cb.equal(u.get("username"), log.get("username")));
            criteria.multiselect(u, log);
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            for (Object[] row : result) {
                assertTrue(row[0] instanceof User);
                assertTrue(row[1] instanceof LogRecord);
            }
            assertEquals(result.size(), 2);
        }
        em.clear();
        {
            // Theta style inner join, multiple
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            Root<Bid> b = criteria.from(Bid.class);
            criteria.where(cb.equal(b.get("item"), i), cb.equal(i.get("seller"), b.get("bidder")));
            criteria.multiselect(i, b);
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 0);
        }
        em.clear();
        {
            // Inner join with implicit ID comparison
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            Root<User> u = criteria.from(User.class);
            criteria.where(cb.equal(i.get("seller"), u), cb.like(u.<String>get("username"), "j%"));
            criteria.multiselect(i, u);
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 3);
            for (Object[] row : result) {
                assertTrue(row[0] instanceof Item);
                assertTrue(row[1] instanceof User);
            }
        }
        em.clear();
        {
            // Inner join with explicit ID comparison
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            Root<User> u = criteria.from(User.class);
            criteria.where(cb.equal(i.get("seller").get("id"), u.get("id")), cb.like(u.<String>get("username"), "j%"));
            criteria.multiselect(i, u);
            Query q = em.createQuery(criteria);
            List<Object[]> result = q.getResultList();
            assertEquals(result.size(), 3);
            for (Object[] row : result) {
                assertTrue(row[0] instanceof Item);
                assertTrue(row[1] instanceof User);
            }
        }
        em.clear();
        {
            // Binding an entity parameter
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            criteria.where(cb.equal(i.get("seller"), cb.parameter(User.class, "seller")));
            criteria.select(i);
            Query q = em.createQuery(criteria);
            User someUser = em.find(User.class, testData.users.getFirstId());
            q.setParameter("seller", someUser);
            List<Item> result = q.getResultList();
            assertEquals(result.size(), 2);
        }
        em.clear();
        {
            // Binding ID parameter
            CriteriaQuery criteria = cb.createQuery();
            Root<Item> i = criteria.from(Item.class);
            criteria.where(cb.equal(i.get("seller").get("id"), cb.parameter(Long.class, "sellerId")));
            criteria.select(i);
            Query q = em.createQuery(criteria);
            Long USER_ID = testData.users.getFirstId();
            q.setParameter("sellerId", USER_ID);
            List<Item> result = q.getResultList();
            assertEquals(result.size(), 2);
        }
        em.clear();
        {
            // Not a join, just ID comparison
            CriteriaQuery<Bid> criteria = cb.createQuery(Bid.class);
            Root<Bid> b = criteria.from(Bid.class);
            criteria.where(cb.equal(b.get("item").get("id"), cb.parameter(Long.class, "itemId")));
            criteria.select(b);
            Query q = em.createQuery(criteria);
            q.setParameter("itemId", testData.items.getFirstId());
            List<Bid> result = q.getResultList();
            assertEquals(result.size(), 3);
        }
        em.clear();
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}

Example 8 with Item

use of org.jpwh.model.querying.Item in project microservices by pwillhan.

the class CallStoredProcedures method callReturningRefCursor.

@Test(groups = "POSTGRESQL")
public void callReturningRefCursor() throws Exception {
    storeTestData();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        /*
            em.unwrap(Session.class).doWork(
                new CallProcedureAndPrintResult() {
                    @Override
                    protected CallableStatement prepare(Connection connection) throws SQLException {
                        CallableStatement statement = connection.prepareCall("{? = call FIND_ITEMS()}");
                        statement.registerOutParameter(1, Types.OTHER);
                        return statement;
                    }

                    @Override
                    protected ResultSet execute(CallableStatement statement) throws SQLException {
                        statement.execute();
                        return (ResultSet)statement.getObject(1);
                    }
                }
            );
            */
        StoredProcedureQuery query = em.createStoredProcedureQuery("FIND_ITEMS", Item.class);
        query.registerStoredProcedureParameter(1, void.class, ParameterMode.REF_CURSOR);
        List<Item> result = query.getResultList();
        for (Item item : result) {
        // ...
        }
        assertEquals(result.size(), 3);
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}

Example 9 with Item

use of org.jpwh.model.querying.Item in project microservices by pwillhan.

the class CallStoredProcedures method callReturningMultipleResultsNative.

@Test(groups = "MYSQL")
public void callReturningMultipleResultsNative() throws Exception {
    storeTestData();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        {
            Session session = em.unwrap(Session.class);
            org.hibernate.procedure.ProcedureCall call = session.createStoredProcedureCall("APPROVE_ITEMS", Item.class);
            org.hibernate.procedure.ProcedureOutputs callOutputs = call.getOutputs();
            boolean[] expectedResults = new boolean[3];
            int i = 0;
            org.hibernate.result.Output output;
            /* 
                   As long as <code>getCurrent()</code> doesn't return <code>null</code>, there
                   are more outputs to process.
                 */
            while ((output = callOutputs.getCurrent()) != null) {
                /* 
                       An output might be a result set, test and cast it.
                     */
                if (output.isResultSet()) {
                    List<Item> result = ((org.hibernate.result.ResultSetOutput) output).getResultList();
                    // one row, the second with two rows
                    if (i == 0) {
                        assertEquals(result.size(), 1);
                    } else if (i == 1) {
                        assertEquals(result.size(), 2);
                    }
                    expectedResults[i] = true;
                } else {
                    /* 
                           If an output is not a result set, it's an update count.
                         */
                    int updateCount = ((org.hibernate.result.UpdateCountOutput) output).getUpdateCount();
                    // ...
                    // We also updated one row in the procedure
                    assertEquals(updateCount, 1);
                    expectedResults[i] = true;
                }
                /* 
                       Proceed with the next output, if there is any.
                     */
                if (!callOutputs.goToNext())
                    break;
                i++;
            }
            for (boolean expectedResult : expectedResults) {
                assertTrue(expectedResult);
            }
        }
        em.clear();
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}

Example 10 with Item

use of org.jpwh.model.querying.Item in project microservices by pwillhan.

the class CallStoredProcedures method callWithInOutParameters.

@Test(groups = "MYSQL")
public void callWithInOutParameters() throws Exception {
    TestDataCategoriesItems testDataCategoriesItems = storeTestData();
    final Long ITEM_ID = testDataCategoriesItems.items.getFirstId();
    UserTransaction tx = TM.getUserTransaction();
    try {
        tx.begin();
        EntityManager em = JPA.createEntityManager();
        /*
            em.unwrap(Session.class).doWork(
                new CallProcedureAndPrintResult() {
                    @Override
                    protected CallableStatement prepare(Connection connection) throws SQLException {
                        CallableStatement statement = connection.prepareCall("{call FIND_ITEM_TOTAL(?, ?)}");
                        statement.setLong(1, ITEM_ID);
                        statement.registerOutParameter(2, Types.VARCHAR);
                        return statement;
                    }

                    @Override
                    protected ResultSet execute(CallableStatement statement) throws SQLException {
                        statement.execute();
                        System.out.println("### TOTAL NR. OF ITEMS: " + statement.getLong(2));
                        return statement.getResultSet();
                    }
                }
            );
            */
        StoredProcedureQuery query = em.createStoredProcedureQuery("FIND_ITEM_TOTAL", Item.class);
        /* 
               Register all parameters by position (starting at 1) and their type.
             */
        query.registerStoredProcedureParameter(1, Long.class, ParameterMode.IN);
        query.registerStoredProcedureParameter(2, Long.class, ParameterMode.OUT);
        /* 
               Bind values to the input parameters.
             */
        query.setParameter(1, ITEM_ID);
        /* 
               Retrieve the result set returned by the procedure.
             */
        List<Item> result = query.getResultList();
        for (Item item : result) {
            // ...
            assertEquals(item.getId(), ITEM_ID);
        }
        /* 
               After you've retrieved the result sets, you can access the output parameter values.
             */
        Long totalNumberOfItems = (Long) query.getOutputParameterValue(2);
        assertEquals(result.size(), 1);
        assertEquals(totalNumberOfItems, new Long(3));
        tx.commit();
        em.close();
    } finally {
        TM.rollback();
    }
}