Hi all,
i guess i have a understanding problem with hibernate. I read a lot of doc's yesterday evening but i can't get it. I have a quite simple problem.
My class MemberSongs has a getter/setter named "musicfile". The field is of type "kasong". In each MemberSong must be a filled "musicfile".
MemberSong is connected with "song_id" to "kasong" with the field "id".

This is, what my mapping looks like:
[/code]
<class name="KAMembersSongs" table="ka_members_songs">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="songId" column="song_id"/>
<property name="musicfile" type="KARealaudio"/>
<many-to-one name="musicfile"
class="de.possessed.zipcreator.KARealaudio"
unique="true"
column="id"
not-null="true"/>
</class>

<class name="KARealaudio" table="ka_realaudio">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="dateiBuy" column="datei_buy" />
</class>
[/code]

I would expect that i get this link, but following error occures. Could you explain me where my mistake is? i guess it's a small problem.

Regards,
Chris

Hibernate version: 3.x
Full stack trace of any exception that occurs:
Caused by: org.hibernate.MappingException: Could not determine type for: de.possessed.zipcreator.KARealaudio, for columns: [org.hibernate.mapping.Column(musicfile)]

Name and version of the database you are using:
MySQL4.1

KAMemberSongs should have a set of KARealaudio

the many-to-one should be in KARealAudio pointing to KAMemberSongs, the property musicfile in KAMemberSongs is not needed if there is a 1 to many relationshiup between KAMemberSongs and KARealaudio.


Read thourgh more of the mapping examples on mapping collections.

hi jamie,

it is a 1 to 1 relation. IN the documentation is written that i need the "many-to-one" tag with option unique=true. I don't need a Set- i need a single object. Isn't this possible?

Regards and thanks,
chris

Could you find that bit in the documentation?

Also if it really is just a 1 - 1, which makes no sense from your class name.

KAMemberSongs implies it contains multiple songs. But this could be a misunderstanding over what your are attempting to do.

This line is superfluous. You declare the musicfile variable already in your many-to-one, one line later. In this line, you suggest that KARealaudio is a user-defined type, without properly defining it.

First, thank you.

Jamie you are right, the classnames are not good. But this is not my system. I just wanted to demonstrate that it is a good idea to use hibernate for such a "system". I hope i'll enlightend to prove that statement :)

Let me clarify:
In my class
KAMemberSongs.musicfile
shall a
KARealaudio be stored.

Every KAMemberSongs-Instance has exactly one KARealaudio-Instance in the field musicfile. The tupels are linked with: KAMemberSongs.song_id -> KARealaudio.id

Wuah, in the moment i wrote this and thought about your hints, i got it!!
Its just easy!
Here is my correct definition:



I really had to delete the son_id definition. I hope i will get i through a setter anyway.

Well, thank you very much! Hope this thread will help others.
CHeers
Chris