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.
Thanks, Thomas
Here my mapping xml: <class-descriptor class="de.ba.studi.chtp.model.Benutzer" table="Benutzer"
<extent-class class-ref="de.ba.studi.chtp.model.Admin" />
<extent-class class-ref="de.ba.studi.chtp.model.Stduser" />
<field-descriptor
name="benutzer_id"
column="benutzer_id"
jdbc-type="INTEGER"
autoincrement="true"
primarykey="true"
/>
<field-descriptor
name="name"
column="name"
jdbc-type="VARCHAR"
length="254"
/>
<field-descriptor
name="vname"
column="vname"
jdbc-type="VARCHAR"
length="254"
/>
<field-descriptor
name="passwort"
column="passwort"
jdbc-type="VARCHAR"
length="254"
/>
<field-descriptor
name="benutzername"
column="benutzername"
jdbc-type="VARCHAR"
length="254"
/>
<field-descriptor
name="ojbConcreteClass"
column="CLASS_NAME"
jdbc-type="VARCHAR"
/>
</class-descriptor><class-descriptor class="de.ba.studi.chtp.model.Admin" table="Admin"
<field-descriptor
name="benutzer_id"
column="benutzer_id"
jdbc-type="INTEGER"
primarykey="true"
autoincrement="true"
/>
<field-descriptor
name="produkte"
column="produkte"
jdbc-type="BIT"
/>
<field-descriptor
name="benutzer"
column="benutzer"
jdbc-type="BIT"
/>
<reference-descriptor name="super"
class-ref="de.ba.studi.chtp.model.Benutzer"
auto-retrieve="true"
auto-update="true"
auto-delete="true"
/>
</class-descriptor><class-descriptor class="de.ba.studi.chtp.model.Stduser" table="Stduser"
<field-descriptor
name="benutzer_id"
column="benutzer_id"
jdbc-type="INTEGER"
primarykey="true"
autoincrement="true"
/>
<reference-descriptor name="super"
class-ref="de.ba.studi.chtp.model.Benutzer"
auto-retrieve="true"
auto-update="true"
auto-delete="true"
/>
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