javax.persistence.CascadeType 同名
- ALL
 - PERSIST
 - MERGE
 - REMOVE
 - REFRESH
 - DETACH
 
在 javax.persistence.CascadeType 之外额外定义
- DELETE
 - SAVE_UPDATE
 - REPLICATE
 - LOCK
 
另有两个已经作废
- DELETE_ORPHAN - 使用 @OneToOne(orphanRemoval=true) or @OneToMany(orphanRemoval=true)
 - EVICT - 使用 DETACH