Question

新闻

@Entity
@Table(name = "NEWS")

@NamedQueries({
    @NamedQuery(name = "News.findAll", query = "SELECT n FROM News n"),
    @NamedQuery(name = "News.delete", query = "DELETE FROM News n WHERE n.newsId in(:ids)")
})

@GenericGenerator(name = "test-increment-strategy", strategy = "increment")
public class News implements Serializable {

    private static final long serialVersionUID = 3330980835510468207L;
    private Integer newsId;
    private String title;
    private String brief;
    private String content;
    private Date created;
    private String dateCreatedString;

    public News() {
    }

    @Id
    @Column(name = "NEWS_ID")
    // @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "news_seq")
    // @SequenceGenerator(name = "news_seq", sequenceName = "NEWS_SEQ")
    @GeneratedValue(generator = "test-increment-strategy")
    public Integer getNewsId() {
        return newsId;
    }

DAO

@Override
@Transactional(readOnly = false)
public void removeNews(List<Integer> listOfIdNewsForDeleting) throws DAOException {
    EntityManager entityManager = getJpaTemplate().getEntityManagerFactory().createEntityManager();

    Query query = entityManager.createNamedQuery("News.delete");
    query.setParameter("ids", listOfIdNewsForDeleting);
    int deleted = query.executeUpdate();
}

尝试删除新闻是不成功的。

TransactionManager不会为我调用的新EntityManager提供交易。

但是我不能使用查询抛出JpaTemplate。有一些想法吗？

Answer 1

事务管理器不会为手动创建的实体管理器启动事务。它只处理容器/弹簧管理的实体管理器。如果没有交易，您无法删除。

JpaTemplate的javadoc建议您使用JPA样式的数据访问。所以使用

@PersistenceContext 
private EntityManager entityManager;

（查看spring文档了解启用它所需的内容）。

如果您真的想要使用JpaTemplate，那么只使用它，而不要使用基础工厂。

Spring JPATemplate DAO。从表中删除项目

1 个答案: