java Hibernate删除多对多惰性集合
我的实体类是:
@Entity
public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(unique = true, nullable = false)
private Long id;
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "dt_creation", nullable = false)
private Date dtCreation;
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "dt_maj", nullable = false)
private Date dtMaj;
// bi-directional many-to-one
@OneToMany(mappedBy = "quality", cascade = CascadeType.ALL, orphanRemoval = true)
private Set<RQulityUser> RQualityUser;
@Entity
public class RQualityUser implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "dt_creation", nullable = false)
private Date dtCreation;
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "dt_maj", nullable = false)
private Date dtMaj;
// bi-directional many-to-one association to Questionnaire
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "fk_user", updatable = false, nullable = false)
private User user;
// bi-directional many-to-one association to QualitePersonne
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "cd_quality_user", updatable = false, nullable = false)
private Quality quality;
当我得到一个用户并试图清除RQualityUser列表时,我不工作:
User user = em.getByid(11);
user.getRQualityUserList().clear();
Hibernate不删除关系表中的记录吗
# 1 楼答案
“延迟加载”意味着只有当您第一次实际访问某个实体时,才会加载该实体
当你这样做的时候
所以您正在清除空列表,然后当您将使用它时,将从DB调用数据
# 2 楼答案
如果你这样做
对于打开的持久上下文和事务内部,Hibernate应该删除记录
如果你没有交易,你应该使用它
如果使用封闭的持久上下文执行
clear()
,则应更新user
以删除记录