Hibernate EntityManager，如何从table_name创建用于删除的查询，其中user_name = something

Question

我目前正在使用spring mvc hibernate构建一个web应用程序。 这是我想使用EntityManager类构建的查询...

DELETE FROM registerform WHERE owner_email = 'some_user_name'

所以这里的重点是我的代码：

@PersistenceContext
    EntityManager em;

@Transactional
    public void removeRegisteredUser(String userName) {
        CriteriaQuery<RegisterForm> c = em.getCriteriaBuilder().createQuery(RegisterForm.class);
        Root<RegisterForm> from = c.from(RegisterForm.class);
        c.delete(from);
        c.where(em.getCriteriaBuilder().equal(from.get("owner_email"), username));
        em.createQuery(c).executeUpdate();
}

所以基本上，它根本不工作，实际上c.delete方法不存在于api ....我无法弄清楚如何在这里创建删除查询，。，

请帮助解决一些代码示例。欢呼声

Answer 1

public void removeRegisteredUser(String userName) { String hqlDelete = "delete RegisterForm where ownerEmail = :email"; int deletedEntities = entityManager.createQuery( hqlDelete ) .setParameter( "email", userName ) .executeUpdate();