BlogJava-【唛呆儿】的随笔日记-随笔分类-JPAhttp://www.blogjava.net/live365-wang/category/47846.htmlzh-cnTue, 22 Feb 2011 10:19:15 GMTTue, 22 Feb 2011 10:19:15 GMT60CascadeType属性说明http://www.blogjava.net/live365-wang/archive/2011/02/22/344839.html唛呆儿唛呆儿Tue, 22 Feb 2011 05:50:00 GMThttp://www.blogjava.net/live365-wang/archive/2011/02/22/344839.htmlhttp://www.blogjava.net/live365-wang/comments/344839.htmlhttp://www.blogjava.net/live365-wang/archive/2011/02/22/344839.html#Feedback0http://www.blogjava.net/live365-wang/comments/commentRss/344839.htmlhttp://www.blogjava.net/live365-wang/services/trackbacks/344839.htmlCascadeType.PERSIST只有A类新增时，会级联B对象新增。若B对象在数据库存（跟新）在则抛异常（让B变为持久态） 

CascadeType.MERGE指A类新增或者变化，会级联B对象（新增或者变化） 

CascadeType.REMOVE只有A类删除时，会级联删除B类； 

CascadeType.ALL包含所有； 

CascadeType.REFRESH没用过。 

综上：大多数情况用CascadeType.MERGE就能达到级联跟新又不报错，用CascadeType.ALL时要斟酌下CascadeType.REMOVE 

唛呆儿 2011-02-22 13:50 发表评论
]]>JPA批注参考http://www.blogjava.net/live365-wang/archive/2011/02/22/344832.html唛呆儿唛呆儿Tue, 22 Feb 2011 05:43:00 GMThttp://www.blogjava.net/live365-wang/archive/2011/02/22/344832.htmlhttp://www.blogjava.net/live365-wang/comments/344832.htmlhttp://www.blogjava.net/live365-wang/archive/2011/02/22/344832.html#Feedback0http://www.blogjava.net/live365-wang/comments/commentRss/344832.htmlhttp://www.blogjava.net/live365-wang/services/trackbacks/344832.html原文地址:

http://www.oracle.com/technology/global/cn/products/ias/toplink/jpa/resources/toplink-jpa-annotations.html



唛呆儿 2011-02-22 13:43 发表评论
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