more queries using QueryDSL

querydsl/src/test/java/org/baeldung/dao/PersonDaoTest.java

@@ -10,6 +10,8 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.transaction.TransactionConfiguration;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.Map;
+
 
 @ContextConfiguration("/test-context.xml")
 @RunWith(SpringJUnit4ClassRunner.class)
@@ -30,4 +32,48 @@ public class PersonDaoTest {
         Person personFromDb = personDao.findPersonsByFirstnameQueryDSL("Kent").get(0);
         Assert.assertEquals(person.getId(), personFromDb.getId());
     }
+
+    @Test
+    public void testMultipleFilter() {
+        personDao.save(new Person("Erich", "Gamma"));
+        Person person = personDao.save(new Person("Ralph", "Beck"));
+        Person person2 = personDao.save(new Person("Ralph", "Johnson"));
+
+        Person personFromDb = personDao.findPersonsByFirstnameAndSurnameQueryDSL("Ralph", "Johnson").get(0);
+        Assert.assertNotSame(person.getId(), personFromDb.getId());
+        Assert.assertEquals(person2.getId(), personFromDb.getId());
+    }
+
+    @Test
+    public void testOrdering() {
+        Person person = personDao.save(new Person("Kent", "Gamma"));
+        personDao.save(new Person("Ralph", "Johnson"));
+        Person person2 = personDao.save(new Person("Kent", "Zivago"));
+
+        Person personFromDb = personDao.findPersonsByFirstnameInDescendingOrderQueryDSL("Kent").get(0);
+        Assert.assertNotSame(person.getId(), personFromDb.getId());
+        Assert.assertEquals(person2.getId(), personFromDb.getId());
+    }
+
+    @Test
+    public void testMaxAge() {
+        personDao.save(new Person("Kent", "Gamma", 20));
+        personDao.save(new Person("Ralph", "Johnson", 35));
+        personDao.save(new Person("Kent", "Zivago", 30));
+
+        int maxAge = personDao.findMaxAge();
+        Assert.assertTrue(maxAge == 35);
+    }
+
+    @Test
+    public void testMaxAgeByName() {
+        personDao.save(new Person("Kent", "Gamma", 20));
+        personDao.save(new Person("Ralph", "Johnson", 35));
+        personDao.save(new Person("Kent", "Zivago", 30));
+
+        Map<String, Integer> maxAge = personDao.findMaxAgeByName();
+        Assert.assertTrue(maxAge.size() == 2);
+        Assert.assertSame(35, maxAge.get("Ralph"));
+        Assert.assertSame(30, maxAge.get("Kent"));
+    }
 }