Hibernate example source code file (Beings.hbm.xml)

This example Hibernate source code file (Beings.hbm.xml) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

alien, being, being, doctype, dtd, hibernate/hibernate, human, human, mapping, mapping, public, this, this

The Hibernate Beings.hbm.xml source code

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<!-- 

  This mapping demonstrates 

     (1) use of a class-to-subselect mapping, that allows data
         defined in other classes to be exposed as a read-only
         entity (you would do this if you really wanted a view,
         but didn't or couldn't define one for some reason)
         This is a "derived entity" mapping.
     
     (2) use of <synchronize/> to ensure that auto-flush happens
         correctly, and that queries against the derived entity
         do not return stale data
     
-->

<hibernate-mapping 
	package="org.hibernate.test.subselect"
	default-access="field">
	
	<class name="Human" table="humans">
		
		<id name="id" unsaved-value="0" 
		        column="bid">
			<generator class="hilo"/>
		</id>
		
		<property name="name" 
			not-null="true"/>
		<property name="sex" 
			not-null="true" 
			update="false"/>
		<property name="address"/>
		<property name="heightInches">
			<column name="height_centimeters" 
				not-null="true" 
				read="height_centimeters / 2.54E0"
				write="? * 2.54E0"/>
		</property>		
		
	</class>
	
	<class name="Alien" table="aliens">
		
		<id name="id" unsaved-value="0" 
		        column="bid">
			<generator class="hilo"/>
		</id>
		
		<property name="identity" 
			not-null="true"
			column="ident"/>
		<property name="planet"/>
		<property name="species" 
			not-null="true" 
			update="false"/>
		<property name="heightInches">
			<column name="height_centimeters" 
				not-null="true" 
				read="height_centimeters / 2.54E0"
				write="? * 2.54E0"/>
		</property>			
			
	</class>
	
	<class name="Being" mutable="false">
	
		<subselect>
			select bid, name as ident, address as loc, 'human' as species, height_centimeters
			from humans 
			union 
			select bid, ident, planet as loc, species, height_centimeters
			from aliens
		</subselect>
		
		<synchronize table="humans"/>
		<synchronize table="aliens"/>
		
		<id name="id" unsaved-value="0" 
		        column="bid">
			<generator class="native"/>
		</id>
		
		<property name="identity" column="ident"/>
		<property name="location" column="loc"/>
		<property name="species"/>
		<property name="heightInches">
			<column name="height_centimeters" 
				not-null="true" 
				read="height_centimeters / 2.54E0"/>
		</property>		
		
	</class>

</hibernate-mapping>