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greener
 Post subject: Can I map to different objects with same name?
PostPosted: Fri Mar 19, 2004 11:13 pm 
Newbie

Joined: Fri Mar 19, 2004 11:04 pm
Posts: 4
Location: WI
Hello - I'm a first time user of Hibernate and have been pleased so far with the product. I think the answer is "no" to this question but figured that someone would know for sure...

I am putting together a library application. I've got videos, books, music. All of which have an attribute of media. Media resides in different packages for the individual domains - books include softcover/hardcover; music includes CD, cassette, etc; video includes DVD, VHS, etc.

I've defined each as a subclass and get the following exception:
Code:
20:38:34,459 ERROR Configuration:252 - Could not compile the mapping document
net.sf.hibernate.MappingException: duplicate import: Media
   at net.sf.hibernate.cfg.Mappings.addImport(Mappings.java:85)
   at net.sf.hibernate.cfg.Binder.bindClass(Binder.java:126)


I expect that I need to name the classes differently. Is this correct or is there a trick about it?
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gavin
 Post subject:
PostPosted: Sat Mar 20, 2004 12:05 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
Show us the mapping documents, I don't quite follow what you are doing.
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greener
 Post subject: Sorry - Here's the mapping document...
PostPosted: Sat Mar 20, 2004 10:24 am 
Newbie

Joined: Fri Mar 19, 2004 11:04 pm
Posts: 4
Location: WI
At a high-level view, I want a lookup table with differing lookup values. I figured that a simple class could be used - each specific value could then be exnteded from the simple class.

You'll note that Genre and Media is used by more than one domain. Is this possible? I can have specific names (ie, BookMedia, VideoMedia, MusicMedia) - but I'd prefer not to.

An alternate question could be: What is the "Hibernate" way to have lookup values and share them in one table?

Here's the mapping document:

Code:
<hibernate-mapping>
    <class name="com.webcodepro.library.domain.Flyweight"
          table="Flyweights">
        <id name="id">
            <generator class="hilo">
               <param name="table">ObjectId</param>
               <param name="column">next_value</param>
               <param name="max_lo">10</param>
            </generator>
        </id>
        <discriminator column="class_name" type="string"/>
        <property name="value"/>
        <subclass name="com.webcodepro.library.domain.video.Genre"
                discriminator-value="video.Genre"/>
        <subclass name="com.webcodepro.library.domain.video.Media"
                discriminator-value="video.Media"/>
        <subclass name="com.webcodepro.library.domain.video.Rating"
                discriminator-value="video.Rating"/>
<!--
        <subclass name="com.webcodepro.library.domain.music.Artist"
                discriminator-value="music.Artist"/>
        <subclass name="com.webcodepro.library.domain.music.Media"
                discriminator-value="music.Media"/>
        <subclass name="com.webcodepro.library.domain.book.Collection"
                discriminator-value="book.Collection"/>
        <subclass name="com.webcodepro.library.domain.book.Genre"
                discriminator-value="book.Genre"/>
        <subclass name="com.webcodepro.library.domain.book.Media"
                discriminator-value="book.Media"/>
-->
    </class>

</hibernate-mapping>
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anthony
 Post subject:
PostPosted: Sat Mar 20, 2004 10:42 am 
Hibernate Team
Hibernate Team

Joined: Thu Dec 18, 2003 9:55 am
Posts: 1977
Location: France
i had many troubles with xml comment, maybe it's only this, change
Code:
<!--
        <subclass name="com.webcodepro.library.domain.music.Artist"
                discriminator-value="music.Artist"/>
        <subclass name="com.webcodepro.library.domain.music.Media"
                discriminator-value="music.Media"/>
        <subclass name="com.webcodepro.library.domain.book.Collection"
                discriminator-value="book.Collection"/>
        <subclass name="com.webcodepro.library.domain.book.Genre"
                discriminator-value="book.Genre"/>
        <subclass name="com.webcodepro.library.domain.book.Media"
                discriminator-value="book.Media"/>
-->

to
Code:
        <!--subclass name="com.webcodepro.library.domain.music.Artist"
                discriminator-value="music.Artist"/-->
        <!--subclass name="com.webcodepro.library.domain.music.Media"
                discriminator-value="music.Media"/-->
        <!--subclass name="com.webcodepro.library.domain.book.Collection"
                discriminator-value="book.Collection"/-->
        <!--subclass name="com.webcodepro.library.domain.book.Genre"
                discriminator-value="book.Genre"/-->
        <!--subclass name="com.webcodepro.library.domain.book.Media"
                discriminator-value="book.Media"/-->



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greener
 Post subject: Comments
PostPosted: Sat Mar 20, 2004 11:34 am 
Newbie

Joined: Fri Mar 19, 2004 11:04 pm
Posts: 4
Location: WI
The block is commented out because of the error listed in the first message. I'll uncomment it when I know if I can fix it or if I need to rename my classes... (c:
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