Subclass association mappings- multiple subclasses

russotto · **Joined:** Sun Aug 20, 2006 4:05 pm **Posts:** 1

I'm using table-per-class-hierarchy inheritance for an entity called, Promotion. One subclass, PriceDiscount, has a bi-directional many-to-one association to VendorContract (see below). Is there a way to specify a Java interface in the "class" element of the one-to-many mapping in VendorContract (see IDealBuyPromotion in VendorContract mapping)? I will need to add an additional subclasses that map to a VendorContract.

Hibernate version:
3.1
Mapping documents:
in Promotion.hbm.xml...
<subclass name="PriceDiscount" discriminator-value="pricing">
<property name="pricingRulePriority" type="string" length="6"/>
<many-to-one name="vendorContract" column="vendorContractID" class="VendorContract" />
</subclass>

in VendorContract.hbm.xml...

<bag name="dealBuyPromotions" cascade="save-update" lazy="true" inverse="true">
<key>
<column name="vendorContractID" />
</key>
<one-to-many class="IDealBuyPromotion"/>
</bag>

tenwit · **Joined:** Thu Dec 23, 2004 9:08 pm **Posts:** 2008

No, but you can add a where="" attribute to the bag, duplicating the effect of the descriminator. Something like:

Code:

<bag name="dealBuyPromotions" cascade="save-update" lazy="true" inverse="true" where="promoType='pricing'">
  <key>
    <column name="vendorContractID" />
  </key>
  <one-to-many class="VendorContractImpl"/>
</bag>

I'm assuming that the descriminator column on the Promotion table is called promoType.