hibernate-orm/eg/org/hibernate/auction/Bid.hbm.xml

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping
package="org.hibernate.auction">
<class name="Bid"
discriminator-value="N">
<comment>A bid or "buy now" for an item.</comment>
<id name="id">
<generator class="native"/>
</id>
<discriminator type="char">
<column name="isBuyNow">
<comment>Y if a "buy now", N if a regular bid.</comment>
</column>
</discriminator>
<natural-id>
<many-to-one name="item"/>
<property name="amount"/>
</natural-id>
<property name="datetime"
not-null="true"
column="`datetime`"/>
<many-to-one name="bidder"
not-null="true"/>
<subclass name="BuyNow"
discriminator-value="Y"/>
</class>
</hibernate-mapping>