javax.persistence.EntityManager.persist()方法的使用及代码示例

x33g5p2x  于2022-01-18 转载在 其他  
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本文整理了Java中javax.persistence.EntityManager.persist()方法的一些代码示例，展示了EntityManager.persist()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。EntityManager.persist()方法的具体详情如下：
包路径：javax.persistence.EntityManager
类名称：EntityManager
方法名：persist

EntityManager.persist介绍

[英]Make an instance managed and persistent.
[中]使实例得到管理和持久化。

代码示例

代码示例来源：origin: stackoverflow.com

EntityManager em = ...;
EntityTransaction tx = em.getTransaction();
tx.begin();

for ( int i=0; i<100000; i++ ) {
  Customer customer = new Customer(.....);
  em.persist(customer);
  if ( i % 20 == 0 ) { //20, same as the JDBC batch size
    //flush a batch of inserts and release memory:
    em.flush();
    em.clear();
  }
}

tx.commit();
session.close();

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

protected final TestEntity getTestEntity(String name) {
  TestEntity te = entityManager.find(TestEntity.class, name);
  if (te == null) {
    te = new TestEntity(name, 0);
    entityManager.persist(te);
  }
  return te;
}

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

@Test(expected = TransactionRequiredException.class)
public void transactionRequiredExceptionOnPersist() {
  EntityManagerFactory emf = mock(EntityManagerFactory.class);
  EntityManager em = SharedEntityManagerCreator.createSharedEntityManager(emf);
  em.persist(new Object());
}

代码示例来源：origin: stackoverflow.com

EntityManager em = emf.createEntityManager();
em.persist(emp);
em.close();    // Note: em can be closed before JTA tx committed. 
em = emf.createEntityManager();
em.persist(emp);
Employee emp = em.find(...);  // load the employee
em.close();
emf.close();

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

@Test
@Priority(10)
public void initData() {
  EntityManager em = getEntityManager();
  em.getTransaction().begin();
  DateTestEntity dte = new DateTestEntity( new Date( 12345000 ) );
  em.persist( dte );
  id1 = dte.getId();
  em.getTransaction().commit();
  em.getTransaction().begin();
  dte = em.find( DateTestEntity.class, id1 );
  dte.setDateValue( new Date( 45678000 ) );
  em.getTransaction().commit();
}

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

@Test
@Priority(10)
public void initData() {
  // Revision 1
  EntityManager em = getEntityManager();
  em.getTransaction().begin();
  em.persist( testEntity );
  em.getTransaction().commit();
  em.close();
}

代码示例来源：origin: Impetus/Kundera

@Test
public void validConstructorTest() throws Exception
{
  emf = Persistence.createEntityManagerFactory("hbaseTest");
  em = emf.createEntityManager();
  BookEntity book = new BookEntity();
  book.setBookId(1);
  book.setTitle("The Complete Reference");
  book.setAuthor("Herbert Schildt");
  book.setPages(500);
  em.persist(book);
  em.clear();
  BookEntity book1 = em.find(BookEntity.class, 1);
  Assert.assertNotNull(book1);
  Assert.assertEquals(1, book1.getBookId());
  Assert.assertEquals("The Complete Reference", book1.getTitle());
  Assert.assertEquals("Herbert Schildt", book1.getAuthor());
  Assert.assertEquals(500, book1.getPages());
  em.remove(book1);
  BookEntity book2 = em.find(BookEntity.class, 1);
  Assert.assertNull(book2);
  em.close();
  emf.close();
}

代码示例来源：origin: Impetus/Kundera

@Test
public void testTypedQuery()
{
  Object p1 = prepareData("1", 10);
  Object p2 = prepareData("2", 20);
  Object p3 = prepareData("3", 15);
  em.persist(p1);
  em.persist(p2);
  em.persist(p3);
  TypedQuery<Person> query = em.createQuery("Select p from Person p", Person.class);
  List<Person> results = query.getResultList();
  Assert.assertNotNull(query);
  Assert.assertNotNull(results);
}

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

@Test
@Priority(10)
public void initData() {
  final EntityManager em = getEntityManager();
  final SetOwningEntity setOwningEntity = new SetOwningEntity( 1, "parent" );
  final SetOwnedEntity setOwnedEntity = new SetOwnedEntity( 2, "child" );
  // Revision 1: Initial persist
  em.getTransaction().begin();
  em.persist( setOwningEntity );
  em.persist( setOwnedEntity );
  em.getTransaction().commit();
  em.clear();
  ing_id = setOwningEntity.getId();
  ed_id = setOwnedEntity.getId();
}

代码示例来源：origin: Impetus/Kundera

@Test
public void testUUID()
{
  EntityManagerFactory emf = Persistence.createEntityManagerFactory("cass_pu");
  UUID key = UUID.randomUUID();
  CassandraUUIDEntity entity = new CassandraUUIDEntity();
  entity.setAge(10);
  entity.setName("vivek");
  entity.setUuidKey(key);
  EntityManager em = emf.createEntityManager();
  em.persist(entity);
  CassandraUUIDEntity result = em.find(CassandraUUIDEntity.class, key);
  Assert.assertNotNull(result);
  Assert.assertEquals(key, result.getUuidKey());
  Assert.assertEquals("vivek", result.getName());
  Assert.assertEquals(new Integer(10), result.getAge());
}

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

@Test
public void testLazyLoading() {
  try {
    Person tony = new Person();
    tony.setFirstName("Tony");
    tony.setLastName("Blair");
    tony.setDriversLicense(new DriversLicense("8439DK"));
    sharedEntityManager.persist(tony);
    setComplete();
    endTransaction();
    startNewTransaction();
    sharedEntityManager.clear();
    Person newTony = entityManagerFactory.createEntityManager().getReference(Person.class, tony.getId());
    assertNotSame(newTony, tony);
    endTransaction();
    assertNotNull(newTony.getDriversLicense());
    newTony.getDriversLicense().getSerialNumber();
  }
  finally {
    deleteFromTables("person", "drivers_license");
  }
}

代码示例来源：origin: stackoverflow.com

EntityManager em = emf.createEntityManager();
try {
  jtaTx.begin();
    em.joinTransaction();         
    em.persist(emp);
em.persist(emp);
em.close();    // Note: em can be closed before JTA tx committed.

代码示例来源：origin: kiegroup/optaplanner

protected <S extends Score, E extends AbstractTestJpaEntity<S>> void findAssertAndChangeScore(
    Class<E> jpaEntityClass, Long id, S oldScore, S newScore) {
  try {
    transactionManager.begin();
    EntityManager em = entityManagerFactory.createEntityManager();
    E jpaEntity = em.find(jpaEntityClass, id);
    em.persist(jpaEntity);
    assertEquals(oldScore, jpaEntity.getScore());
    jpaEntity.setScore(newScore);
    jpaEntity = em.merge(jpaEntity);
    transactionManager.commit();
  } catch (NotSupportedException | SystemException | RollbackException | HeuristicRollbackException | HeuristicMixedException e) {
    throw new RuntimeException("Transaction failed.", e);
  }
}

代码示例来源：origin: stackoverflow.com

public void uniqueKey() {
  EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("default");

  ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
  ValidatorContext validatorContext = validatorFactory.usingContext();
  validatorContext.constraintValidatorFactory(new ConstraintValidatorFactoryImpl(entityManagerFactory));
  Validator validator = validatorContext.getValidator();

  EntityManager em = entityManagerFactory.createEntityManager();

  User se = new User("abc", poizon);

    Set<ConstraintViolation<User>> violations = validator.validate(se);
  System.out.println("Size:- " + violations.size());

  em.getTransaction().begin();
  em.persist(se);
  em.getTransaction().commit();

    User se1 = new User("abc");

  violations = validator.validate(se1);

  System.out.println("Size:- " + violations.size());
}

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

private void withBatch() {
  int entityCount = 100;
  //tag::batch-session-batch-insert-example[]
  EntityManager entityManager = null;
  EntityTransaction txn = null;
  try {
    entityManager = entityManagerFactory().createEntityManager();
    txn = entityManager.getTransaction();
    txn.begin();
    int batchSize = 25;
    for ( int i = 0; i < entityCount; i++ ) {
      if ( i > 0 && i % batchSize == 0 ) {
        //flush a batch of inserts and release memory
        entityManager.flush();
        entityManager.clear();
      }
      Person Person = new Person( String.format( "Person %d", i ) );
      entityManager.persist( Person );
    }
    txn.commit();
  } catch (RuntimeException e) {
    if ( txn != null && txn.isActive()) txn.rollback();
      throw e;
  } finally {
    if (entityManager != null) {
      entityManager.close();
    }
  }
  //end::batch-session-batch-insert-example[]
}

代码示例来源：origin: kiegroup/jbpm

@Override
public void saveMapping(Context context, Long ksessionId, String ownerId) {
  EntityManagerInfo info = getEntityManager(context);
  EntityManager em = info.getEntityManager();
  em.persist(new ContextMappingInfo(resolveContext(context, em).getContextId().toString(),
      ksessionId, ownerId));
  if (!info.isShared()) {
    em.close();
  }
}

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

@Test
@Priority(10)
public void initData() {
  EntityManager em = getEntityManager();
  // Revision 1
  em.getTransaction().begin();
  StrTestEntity entity = new StrTestEntity( "x" );
  em.persist( entity );
  em.getTransaction().commit();
  id = entity.getId();
  // Revision 2
  em.getTransaction().begin();
  entity = em.find( StrTestEntity.class, entity.getId() );
  entity.setStr( "y" );
  entity = em.merge( entity );
  em.getTransaction().commit();
  em.close();
}

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

@Test
@Priority(10)
public void initData() {
  EntityManager em = getEntityManager();
  em.getTransaction().begin();
  PropertyAccessTypeEntity pate = new PropertyAccessTypeEntity( "data" );
  em.persist( pate );
  id1 = pate.getId();
  em.getTransaction().commit();
  em.getTransaction().begin();
  pate = em.find( PropertyAccessTypeEntity.class, id1 );
  pate.writeData( "data2" );
  em.getTransaction().commit();
}

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

@Test
@Priority(10)
public void initData() {
  EntityManager em = getEntityManager();
  // Revision 1
  em.getTransaction().begin();
  EffectiveEntity1 entity = new EffectiveEntity1( 1L, "commonField", "specificField1" );
  em.persist( entity );
  em.getTransaction().commit();
  em.close();
}

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

@Test(expected = RuntimeException.class)
public void testTransactionRollback() throws InterruptedException {
  // Trying to persist an entity - however the listener should throw an exception, so the entity
  // shouldn't be persisted
  EntityManager em = getEntityManager();
  em.getTransaction().begin();
  StrTestEntity te = new StrTestEntity( "x" );
  em.persist( te );
  em.getTransaction().commit();
}

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