This note is about the problems that I met while using Hibernate.

Generated Value

@Id
@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")

Mapping

// One to one
@OneToOne(cascade = {CascadeType.PERSIST, CascadeType.REFRESH})
@JoinColumn(name = "memberId")

• CascadeType.PERSIST : means that save() or persist() operations cascade to related entities.
• CascadeType.MERGE : means that related entities are merged into managed state when the owning entity is merged.
• CascadeType.REFRESH : does the same thing for the refresh() operation.
• CascadeType.REMOVE : removes all related entities association with this setting when the owning entity is deleted.
• CascadeType.DETACH : detaches all related entities if a “manual detach” occurs.
• CascadeType.ALL : is shorthand for all of the above cascade operations.

竟然无法拒绝你的打赏