Thanks for help .... @ Thomas Dudziak
I have a Object called "Produktgruppe". In each of this there is a Collection of Produktgruppe.
For this i have a table called "Produktgruppe" with rows: Id, Inid, name
In "inid" i will store the reference to the group over it (selfjoin between inid and id) and null if it is one of the master groups. So for example i could have main groups with cars and computer und it car e.g. ford and opel,...
The saving of data works fine ... here an example of a table: +-----+----------+------+ | id | name | inid | +-----+----------+------+ | 21 | testkat | NULL | | 41 | neuKat | NULL | | 81 | asdasdf | NULL | | 181 | blubber | NULL | | 201 | blubber2 | 41 | | 221 | test3 | 41 | +-----+----------+------+
here i have 4 main groups an in group "neuKat" 2 groups called blubber2 and test3.
I have set auto-retrieve= true! So i think if i load the neuKat Object, i also retrieve the 2 groups blubber2 and test3 in the collection of neuKat. But i did not work???
Thanks, Thomas
Here my Deskriptor of Produktgruppe:
<class-descriptor
class="de.ba.studi.chtp.model.Produktgruppe"
table="Produktgruppe"
auto-retrieve="true"
>
<field-descriptor
name="id"
column="id"
jdbc-type="INTEGER"
primarykey="true"
autoincrement="true"
>
</field-descriptor>
<field-descriptor
name="inId"
column="inId"
jdbc-type="INTEGER"
>
</field-descriptor>
<field-descriptor
name="name"
column="name"
jdbc-type="VARCHAR"
primarykey="true"
>
</field-descriptor>
<collection-descriptor
name="produktgruppen"
element-class-ref="de.ba.studi.chtp.model.Produktgruppe"
orderby="inId"
sort="DESC"
auto-retrieve="true"
auto-update="true"
>
<inverse-foreignkey field-ref="inId"/>
</collection-descriptor>
</class-descriptor>Thomas Dudziak schrieb:
Thomas Papke wrote:
Hello to OJB-Users,
I started to learn how to use OJB with a little example, but here i have a problem. Maybe anyone could help.
I have 3 classes with a few attributes: abstract class benutzer; - string name - string vname - int benutzer_id - string passwort - string benutzername - string ojbConcreteClass class stduser extends benutzer; - no extra attributes yet class admin extends benutzer; - bollean benutzer;
I want to map the conrete objects stduser and admin to the 3 tables: benutzer, stduser and admin. In table benutzer, i want to have the attributes of benutzer and in stduser/admin the special attributes.
Everything works fine if benutzer is not abstract. If it is set to abstract i got the following error if i want to store a stduser:
Can't create new base class object for 'de.ba.studi.chtp.model.Benutzer'
Maybe anybody could help. I can't find a docu how to map classes extended from a abstract class.
I wonder, both of your super-references have no foreignkey, which should not work (OJB should give you an error about this, if not then there is a bug in the reading of the repository.xml). Try adding a foreignkey pointing to benutzer_id.
If that still doesn't work, then please post some more details (used OJB version, exact stacktrace etc.).
Tom
--------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
--------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
