本文整理了Java中javax.persistence.Query类的一些代码示例，展示了Query类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query类的具体详情如下：
包路径：javax.persistence.Query
类名称：Query

Query介绍

[英]Interface used to control query execution.
[中]用于控制查询执行的接口。

代码示例

代码示例来源：origin: kiegroup/jbpm

@SuppressWarnings("unchecked")
public List<String> findContextIdForEvent(String eventType, String ownerId) {
  EntityManager em = emf.createEntityManager();
  Query findQuery = em.createNamedQuery("FindProcessInstanceWaitingForEvent")
      .setParameter("eventType", eventType).setParameter("ownerId", ownerId);
  return findQuery.getResultList();
}

代码示例来源：origin: spring-projects/spring-framework

protected void deleteAllPeopleUsingEntityManager(EntityManager em) {
  em.createQuery("delete from Person p").executeUpdate();
}

代码示例来源：origin: hibernate/hibernate-orm

private static boolean hasData(EntityManager entityManager) {
    return (((Long) entityManager.createQuery( "select count(a) from Address a" ).getSingleResult()) +
        ((Long) entityManager.createQuery( "select count(p) from Person p" ).getSingleResult())) > 0;
  }
}

代码示例来源：origin: stackoverflow.com

// SQL: SELECT * FROM table LIMIT start, maxRows;

Query q = session.createQuery("FROM table");
q.setFirstResult(start);
q.setMaxResults(maxRows);

代码示例来源：origin: stackoverflow.com

String sql = "SELECT t FROM table t";
Query query = em.createQuery(sql);
query.setFirstResult(firstPosition);
query.setMaxResults(numberOfRecords);
List result = query.getResultList();

代码示例来源：origin: stackoverflow.com

Query empQuery = session.createQuery(hqlQuery);
empQuery.setMaxResults(maxResult);
employees = (List<Employee>) empQuery.list();
for (Employee emp : employees) {
  Hibernate.initialize(emp.address);
}

代码示例来源：origin: Impetus/Kundera

/**
 * Test positional query.
 */
private void testPositionalQuery()
{
  String queryString = "Select min(p.salary) from PersonES p where p.personName = ?1";
  Query query = em.createQuery(queryString);
  query.setParameter(1, "amit");
  List resultList = query.getResultList();
  Assert.assertEquals(1, resultList.size());
  Assert.assertEquals(100.0, resultList.get(0));
}

代码示例来源：origin: spring-projects/spring-data-examples

@Override
  @SuppressWarnings("unchecked")
  public List<Employee> findSubordinates(Employee manager) {

    return entityManager.createQuery("SELECT u from User u where u.manager = :manager") //
        .setParameter("manager", manager) //
        .getResultList();
  }
}

代码示例来源：origin: spring-projects/spring-integration-samples

@SuppressWarnings("unchecked")
public static List<LoanShark> findLoanSharkEntries(int firstResult, int maxResults) {
  return entityManager().createQuery("select o from LoanShark o").setFirstResult(firstResult).setMaxResults(maxResults).getResultList();
}

代码示例来源：origin: spring-projects/spring-framework

@Test
@SuppressWarnings("unchecked")
public void testEntityManagerProxyIsProxy() {
  assertTrue(Proxy.isProxyClass(sharedEntityManager.getClass()));
  Query q = sharedEntityManager.createQuery("select p from Person as p");
  q.getResultList();
  assertTrue("Should be open to start with", sharedEntityManager.isOpen());
  sharedEntityManager.close();
  assertTrue("Close should have been silently ignored", sharedEntityManager.isOpen());
}

代码示例来源：origin: Impetus/Kundera

/**
 * Test max aggregation.
 */
private void testMaxAggregation()
{
  String queryString = "Select max(p.age) from PersonES p";
  Query query = em.createQuery(queryString);
  List resultList = query.getResultList();
  Assert.assertEquals(1, resultList.size());
  Assert.assertEquals(40.0, resultList.get(0));
}

代码示例来源：origin: hibernate/hibernate-orm

final EntityManagerFactory emf = persistenceProvider.createEntityManagerFactory( "hibernate-osgi-test", null );
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
em.persist( new DataPoint( "Brett" ) );
em.getTransaction().commit();
em.close();
em = emf.createEntityManager();
em.getTransaction().begin();
DataPoint dp = em.find( DataPoint.class, 1 );
em.close();
em = emf.createEntityManager();
em.getTransaction().begin();
dp = em.find( DataPoint.class, 1 );
em = emf.createEntityManager();
em.getTransaction().begin();
em.createQuery( "delete from DataPoint" ).executeUpdate();
em.getTransaction().commit();
em.close();

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

@SuppressWarnings("unchecked")
@Override
public List<FulfillmentGroup> readUnprocessedFulfillmentGroups(int start,
    int maxResults) {
  Query query = em.createNamedQuery("BC_READ_UNPROCESSED_FULFILLMENT_GROUP_ASC");
  query.setFirstResult(start);
  query.setMaxResults(maxResults);
  
  return query.getResultList();
}

代码示例来源：origin: kiegroup/jbpm

@Override
protected int getProcessInstancesCount() {
  boolean txOwner = false;
  if( useTransactions ) { 
    txOwner = txm.begin();
  }
  int size =  emf.createEntityManager().createQuery( "FROM ProcessInstanceInfo" ).getResultList().size();
  if( useTransactions ) { 
    txm.commit(txOwner);
  }
  return size;
}

代码示例来源：origin: spring-projects/spring-framework

@Test
@SuppressWarnings("unchecked")
public void testQueryNoPersons() {
  EntityManager em = entityManagerFactory.createEntityManager();
  Query q = em.createQuery("select p from Person as p");
  List<Person> people = q.getResultList();
  assertEquals(0, people.size());
  try {
    assertNull(q.getSingleResult());
    fail("Should have thrown NoResultException");
  }
  catch (NoResultException ex) {
    // expected
  }
}

代码示例来源：origin: Impetus/Kundera

/**
 * Test delete all.
 */
private void testDeleteAll()
{
  persistBooks();
  int result = em.createQuery("delete from Book b").executeUpdate();
  Assert.assertEquals(4, result);
  assertDeleted(T, T, T, T);
}

代码示例来源：origin: hibernate/hibernate-orm

@Test
public void test() {
  doInJPA( this::sessionFactory, entityManager -> {
    Thing thing = new Thing();
    entityManager.persist( thing );
    entityManager
    .createQuery( "update thing set special = :s, version = version + 1" )
    .setParameter( "s", "new" )
    .executeUpdate();
    thing.special = "If I'm flush to the DB you get an OptimisticLockException";
  } );
}

代码示例来源：origin: Impetus/Kundera

/**
 * @param b
 */
private void testNativeQuery(boolean b)
{
  String s = "Select * From " + "\"StudentUUID\"";
  EntityManager em = emf.createEntityManager();
  Query q = em.createNativeQuery(s, StudentUUID.class);
  List<StudentUUID> results = q.getResultList();
  Assert.assertNotNull(results);
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void deferredQueryWithSingleResult() {
  EntityManagerFactory emf = mock(EntityManagerFactory.class);
  EntityManager targetEm = mock(EntityManager.class);
  Query query = mock(Query.class);
  given(emf.createEntityManager()).willReturn(targetEm);
  given(targetEm.createQuery("x")).willReturn(query);
  given(targetEm.isOpen()).willReturn(true);
  EntityManager em = SharedEntityManagerCreator.createSharedEntityManager(emf);
  em.createQuery("x").getSingleResult();
  verify(query).getSingleResult();
  verify(targetEm).close();
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void deferredQueryWithUpdate() {
  EntityManagerFactory emf = mock(EntityManagerFactory.class);
  EntityManager targetEm = mock(EntityManager.class);
  Query query = mock(Query.class);
  given(emf.createEntityManager()).willReturn(targetEm);
  given(targetEm.createQuery("x")).willReturn(query);
  given(targetEm.isOpen()).willReturn(true);
  EntityManager em = SharedEntityManagerCreator.createSharedEntityManager(emf);
  em.createQuery("x").executeUpdate();
  verify(query).executeUpdate();
  verify(targetEm).close();
}