CascadeType

[smallnest]

if EntityBean A use an associated entityBean B,

1. CascadeType.CREATE
when A is created,persistent context will create associated B

2. CascadeType.MERGE
when A is merged,persistent context will merge associated B

3.CascadeType.REMOVE
when A is removed,persistent context will removed associated B

4.CascadeType.ALL
when A is created/merged/removed,persistent context will rcreated/merged/removed associated B

Cascade looks like "pass"

[mduffy_lists]

Hmmm.....

This seems oddly limited.

Assume I have a table of users and a table of role types and a mapping table for a many to many associaition. My role types are a limited set that does not change (very often).

If I create a user I just want to creat the user and a mapping to an existing role type. I do not want to create a new role type.

Similarly, when I delete a user I just want to delete the user and the mapping, I do not want to delete the role type, which is mapped to other users.

Can someone please clarify cascade type.

Thx.

Mike

[kabirkhan]

If you don't want cascading to occur then do not specify a cascade value in your @ManyToMany, @OneToMany or @ManyToOne. This should resolve to cascade="none" in the underlying Hibernate mapping.

[mduffy_lists]

Thx.

My mistake.

The EJB 3.0 SPec in section, "10.1.12 ManyToOne Annotation", clearly states that the default is, "No operations are cascaded."

Mike

[epbernard]

Actually the cascade semantic is a bit more subtle.
Read the 6.3 chapter of the spec for more infos