use of org.jpwh.model.fetching.eagerjoin.Item in project microservices by pwillhan.
the class EagerJoin method storeTestData.
public FetchTestData storeTestData() throws Exception {
UserTransaction tx = TM.getUserTransaction();
tx.begin();
EntityManager em = JPA.createEntityManager();
Long[] itemIds = new Long[3];
Long[] userIds = new Long[3];
User johndoe = new User("johndoe");
em.persist(johndoe);
userIds[0] = johndoe.getId();
User janeroe = new User("janeroe");
em.persist(janeroe);
userIds[1] = janeroe.getId();
User robertdoe = new User("robertdoe");
em.persist(robertdoe);
userIds[2] = robertdoe.getId();
Item item = new Item("Item One", CalendarUtil.TOMORROW.getTime(), johndoe);
em.persist(item);
itemIds[0] = item.getId();
for (int i = 1; i <= 3; i++) {
Bid bid = new Bid(item, robertdoe, new BigDecimal(9 + i));
item.getBids().add(bid);
em.persist(bid);
}
item = new Item("Item Two", CalendarUtil.TOMORROW.getTime(), johndoe);
em.persist(item);
itemIds[1] = item.getId();
for (int i = 1; i <= 1; i++) {
Bid bid = new Bid(item, janeroe, new BigDecimal(2 + i));
item.getBids().add(bid);
em.persist(bid);
}
item = new Item("Item Three", CalendarUtil.AFTER_TOMORROW.getTime(), janeroe);
em.persist(item);
itemIds[2] = item.getId();
tx.commit();
em.close();
FetchTestData testData = new FetchTestData();
testData.items = new TestData(itemIds);
testData.users = new TestData(userIds);
return testData;
}
use of org.jpwh.model.fetching.eagerjoin.Item in project microservices by pwillhan.
the class EagerJoin method fetchEagerJoin.
@Test
public void fetchEagerJoin() throws Exception {
FetchTestData testData = storeTestData();
UserTransaction tx = TM.getUserTransaction();
try {
tx.begin();
EntityManager em = JPA.createEntityManager();
Long ITEM_ID = testData.items.getFirstId();
Item item = em.find(Item.class, ITEM_ID);
// select i.*, u.*, b.*
// from ITEM i
// left outer join USERS u on u.ID = i.SELLER_ID
// left outer join BID b on b.ITEM_ID = i.ID
// where i.ID = ?
// Done fetching, no more lazy loading
em.detach(item);
// In detached state, bids are available...
assertEquals(item.getBids().size(), 3);
assertNotNull(item.getBids().iterator().next().getAmount());
// .. and the seller
assertEquals(item.getSeller().getUsername(), "johndoe");
tx.commit();
em.close();
} finally {
TM.rollback();
}
}
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