IdentityProviderEntityManagerImpl.java 文件源码

@Override
@Transactional(readOnly = true)
public YourEntity findYourEntityByEmail(String email) {

    CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
    final CriteriaQuery<YourEntity> criteriaQuery = criteriaBuilder.createQuery(YourEntity.class);
    final Root<YourEntity> yourEntityRoot = criteriaQuery.from(YourEntity.class);

    criteriaQuery.select(yourEntityRoot);
    criteriaQuery.where(criteriaBuilder.equal(yourEntityRoot.get("entityEmailAddress"), email));
    try {
        return entityManager.createQuery(criteriaQuery).getSingleResult();
    } catch(NoResultException nre) {
        return null;
    }
}