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many to many Question

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bruno.braga

Post subject: many to many Question

Posted: Fri Nov 03, 2006 3:37 pm

Beginner

Joined: Fri Nov 03, 2006 3:21 pm
Posts: 30

POJOs:

User.java
- idUser
- username
- password
- email

UserGroup (table, it is not mapped)
- idUser
- idGroup

Group.java
- idGroup
- name

CODE (INSERT):
...
user.setUsername("test");
Set<Group> listGroup = new HashSet<Group>();
listGroup.add(group);
user.setGroups(listGroup);

QUESTION:
In insert, when save a new User the Hibernate save data in table UserGroup for me.

But, as I do for alter the email of the User without have that load data of the UserGroup?

When I alter the User, the Hibernate is delete my data of the UserGroup (for this user).

Thanks

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Sagi

Post subject: hbm?

Posted: Mon Nov 06, 2006 2:45 am

Beginner

Joined: Mon Nov 06, 2006 2:40 am
Posts: 29
Location: New Delhi, India

Please attach your hbm files..

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bruno.braga

Post subject:

Posted: Mon Nov 06, 2006 7:27 am

Beginner

Joined: Fri Nov 03, 2006 3:21 pm
Posts: 30

No hbm...
Annotations:

User.java:

Code:

   @ManyToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY)
   @JoinTable(name = "USER_GROUP", joinColumns = { @JoinColumn(name = "ID_USER") }, inverseJoinColumns = { @JoinColumn(name = "ID_GROUP") })
   public Set<Group> getGroups() {
      return this.groups;
   }

Group.java:

Code:

   @ManyToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY, mappedBy = "groups")
   public Set<User> getUser() {
      return this.users;
   }

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Sagi

Post subject:

Posted: Mon Nov 06, 2006 7:46 am

Beginner

Joined: Mon Nov 06, 2006 2:40 am
Posts: 29
Location: New Delhi, India

Set cascade = none in both and remove inverseJoinColumn and try....

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bruno.braga

Post subject:

Posted: Mon Nov 06, 2006 8:20 am

Beginner

Joined: Fri Nov 03, 2006 3:21 pm
Posts: 30

If I remove the inverseJoinColumn gives problem in the my queries, because I need that the tables be related.

cascade = none

Remove the cascade did not resolve :/

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