Hello everyone.
I got a pretty simple parent/child relationship here, which looks like this:
- Email servers have n folders.
- Folders can have n (sub-)folders.
- Folders have a reference to their parent folder as well as to the email server they belong to.
My mapping files look like this:
MailServer.hbm.xmlCode:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 02.05.2011 12:32:52 by Hibernate Tools 3.3.0.GA -->
<hibernate-mapping>
<class name="test.MailServer" table="MAILSERVER">
<id name="id" type="long" access="field">
<column name="MAIL_SERVER_ID" />
<generator class="native" />
</id>
<bag name="folders" table="FOLDERS" lazy="false" inverse="true" cascade="all-delete-orphan">
<key column="MAIL_SERVER_ID"></key>
<one-to-many class="test.Folder" />
</bag>
</class>
</hibernate-mapping>
Folder.hbm.xmlCode:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 04.05.2011 15:02:31 by Hibernate Tools 3.3.0.GA -->
<hibernate-mapping>
<class name="test.Folder" table="FOLDERS">
<id name="id" type="long" access="field">
<column name="FOLDER_ID" />
<generator class="native" />
</id>
<many-to-one name="mailServer" column="MAIL_SERVER_ID" not-null="true" />
<bag name="folders" table="FOLDERS" lazy="false" inverse="true" cascade="all">
<key column="PARENT_FOLDER_ID" not-null="false"></key>
<one-to-many class="test.Folder" />
</bag>
<many-to-one name="parentFolder" column="PARENT_FOLDER_ID" />
</class>
</hibernate-mapping>
The problem I got, is the following.
Let's say, I have the following hierachy:
Code:
- MyMailServer
Folder1
- Folder2
Subfolder
Folder3
When I call
Code:
hibernateSession.save(mailServerInstance);
or
Code:
hibernateSession.update(mailServerInstance);
then Hibernate correctly stores everything to the database. The parent column id's are filled correctly. Same for all other references.
BUT when I load the data, Hibernate reloads the folder hierachy like this:
Code:
- MyMailServer
Folder1
Folder2
Subfolder
Folder3
I understand the reason: Subfolder has a reference to its MailServer and thus, Hibernate ads it there instead of the folder where it belongs to.
But, how do I solve this problem?
Thanks in advance!
Ps.: I'm pretty new to Hibernate, so please be gentle :-)
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