ManyToManyTest.java

package org.hibernate.examples.mapping.associations.manytomany;

import lombok.extern.slf4j.Slf4j;
import org.hibernate.examples.AbstractJpaTest;
import org.junit.Test;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * org.hibernate.examples.mapping.associations.manytomany.ManyToManyTest
 *
 * @author 배성혁 sunghyouk.bae@gmail.com
 * @since 2013. 11. 28. 오후 11:45
 */
@Slf4j
@Transactional
public class ManyToManyTest extends AbstractJpaTest {

  @PersistenceContext
  EntityManager em;

  @Test
  public void manyToManyTest() throws Exception {

    AccountOwner owner = new AccountOwner();
    owner.setSSN("0123456");
    BankAccount soge = new BankAccount();
    soge.setAccountNumber("X2345000");
    owner.getBankAccounts().add(soge);
    soge.getOwners().add(owner);

    // mappedBy 가 AccountOwner로 설정되었다는 것은 AccountOwner 를 기준으로 cascading 이 된다는 뜻이다.
    em.persist(owner);
    em.flush();
    em.clear();

    // read from inverse side
    soge = em.find(BankAccount.class, soge.getId());
    assertThat(soge.getOwners()).hasSize(1);
//    assertThat(soge.getOwners()).onProperty("id").contains(owner.getId());

    em.clear();

    // read from non-inverse side and update data
    owner = em.find(AccountOwner.class, owner.getId());
    assertThat(owner.getBankAccounts().size()).isEqualTo(1);
//    assertThat(owner.getBankAccounts()).onProperty("id").contains(soge.getId());

    soge = owner.getBankAccounts().iterator().next();
    log.debug("BankAccount=[{}]", soge);
    owner.getBankAccounts().remove(soge);

    BankAccount barclays = new BankAccount();
    barclays.setAccountNumber("ZZZ-009");
    barclays.getOwners().add(owner);
    owner.getBankAccounts().add(barclays);

    em.remove(soge);
    em.flush();
    em.clear();

    // del data
    owner = em.find(AccountOwner.class, owner.getId());
    assertThat(owner.getBankAccounts().size()).isEqualTo(1);
    assertThat(owner.getBankAccounts().iterator().next().getId()).isEqualTo(barclays.getId());

    for (BankAccount account : owner.getBankAccounts()) {
      log.debug("BankAccount=[{}]", account);
    }

    barclays = owner.getBankAccounts().iterator().next();
    barclays.getOwners().clear();
    owner.getBankAccounts().clear();

    em.flush();
  }
}