Hi all,

I am new to hibernate and wanted to use XDoclet to generate the mapping xml finle. I was playing around with the Hibernate2.1 download. I wanted to generate the exact xml mapping for the sample app, 'eg' and ran into problem of not knowing how to set the hibernate.query.imports property from xdoclet tag, i.e. I want to tag the AuctionItem.java class so that it know how to generate the <import/> in the AuctionItem.hbm.xml file.

Thanks for any help,

--danny

First, what is it you are wanting to import? The AuctionItem class? That happens by default without having to specify anything at all.

If something else, I'm pretty sure there is not a tag for generating an import statement. I think you'd have to use a merge file.

the AuctionItem's dependent object AuctionInfo is being use by one of the HQL query statement. And this is why, at runtime, hibernate need to see this class for the return values of the executed query. Here is the snipet of the codes in the example 'eg' that comes with the Hibernate distribution.

List auctions = s.createQuery(
"select new AuctionInfo( item.id, item.description, item.ends, max(bid.amount) ) "
+ "from AuctionItem item "
+ "left join item.bids bid "
+ "group by item.id, item.description, item.ends "
+ "order by item.ends desc"
)
.setMaxResults(100)
.list();
the xml:

<hibernate-mapping
package="org.hibernate.auction">

<import class="AuctionInfo"/>

<class name="AuctionItem">
<id name="id">
<generator class="native"/>
</id>
<property name="description"/>
<property name="ends"/>
<property name="condition"/>
<many-to-one name="seller" not-null="true"/>
<many-to-one name="successfulBid" outer-join="false"/>
<bag name="bids" lazy="true" inverse="true" cascade="all">
<key column="item"/>
<one-to-many class="Bid"/>
</bag>
</class>

</hibernate-mapping>

and I need to generate this exact mapping using xdoclet extenstion for hibernate.

Thanks,

--danny

Just add a separate mapping document with only that <import> in it

Gavin,

Thanks for you response, but how can you control this from xdoclet? Because AuctionInfo is a dependent object of AuctionItem. Even though there isn't any component mappin for AuctionInfo inside the AuctionItem mapping xml, but the HQL statem on AuctionItem's db tables return a collection of AuctionInfo, and for that the current session need know how to load the AuctionInfo.class to construct the return collection.

Thanks,

--danny

WHy would you need to generate it from XDoclet?? Just write it! :)

Gavin,

I've used n2n ORM tool about 3-4 yrs ago while working @ebuilt, where we build our own product calle Codigo, and the tool wasn't that flexible. And the thing that catch my attention on Hibernate was its flexibilities in going any directions for mapping. At my current company where I am doing re-engineer of a existing product, I choose XDoclet to start from the DO layer and generate the Mapping files. Mapping metadata provides good documentation of how an instance of a class related to other classes. And since HQL statement may associate with other java class that is not mapped to the database table( which mean there isn't a mapping xml file for it), and I need to tag these java class so that hibernate knows to imports these java class when it try to execute the HQL statement. If you know that xdoclet is not supporting this, then do you know of a way to get around it?

Thanks,

--danny