Java Hibernate: one-to-many Association issues, javahibernate Association

Java Hibernate: one-to-many Association issues, javahibernate Association

Hibernate one-to-multiple self-Association Problems

This is hard to describe clearly. I can only reference the post I asked in CSDN:
Http://topic.csdn.net/u/20080711/16/7494bf10-48ca-4b2e-8a01-303e647f5516.html
Method, get a PO in the form, and then session. save (po), as follows:


Program code
Tx = session. beginTransaction ();
Session. save (catalog );
Tx. commit ();




Method B is also used to obtain a PO in the form and a PO_ID, as shown below:


Program code
Public void addChildCatalog (int id, Catalog c11 ){
Catalog c1 = this. getCatalog (id );
Log.info ("c11.getId ():" + c11.getId ());
C1.getChildCatalogs (). add (c11 );
C11.setParentCatalog (c1 );

Session session = HibernateUtil. getSession ();
Transaction tx = session. beginTransaction ();

Try {
Session. save (c1 );
Session. save (c11 );
Tx. commit ();
} Catch (HibernateException e ){
If (tx! = Null ){
HibernateUtil. rollbackTransaction (tx );
}
} Finally {
If (session! = Null ){
HibernateUtil. closeSession (session );
}
}
}




The first feature, referred to as the feature, is used to save A top-level menu and has no association.
The second feature, function B, is used to perform associated storage based on the parent ID.

The problem is: I enter the function page and use the function. It is normal, and then use the function. It is normal and normal... It's okay to use it N times.
Then I use the B function and add sub-classes without stopping. It is also normal... It is normal to use it N times.

Note: After I use the B function, everything becomes abnormal. Using the function is equivalent to the last B function operation, just like using the B function! A subcategory is added.

In addition, the problem is that I can only keep extending the sub-classes down and cannot add existing same-level classes. For example

Program code
Level 1 id: 1 c_id = null
Level 2 id: 2 c_id = 1
Level 3 id: 3 c_id = 2

If the association form in the database is like this, I can only add Level 4 Based on the id of Level 3, not Level 3 under Level 2, such as id: 4 c_id = 2; in this case, I cannot join. The console only has select operations, but I can add id: 4 c_id = 3.

The most funny thing is that when I turn off the browser and re-open the page, the function is normal and the same level id is added: 4 c_id = 2; OK,
Then I extended down the category and encountered the above problem. What I don't understand most is what it has to do with browsers! (My IE6, Khan)

In addition, the association between hbm. xml is attached.


Program code
<! -- Self -->
<Role-to-one name = "parentCatalog"
Class = "com. blur. myHibernate. po. article. Catalog">
<Column name = "catalog_id"> </column>
</Role-to-one>

<Set name = "childCatalogs" cascade = "save-update"
Inverse = "true" lazy = "false">
<Key>
<Column name = "catalog_id"> </column>
</Key>
<One-to-least
Class = "com. blur. myHibernate. po. article. Catalog"/>
</Set>


Solution: When formBean submits a form, the database in the domain is retained for the next time. By default, struts formBean sets scope as session and request manually...