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In this example The mapping document tells Hibernate that the Message class is to be persisted to the MESSAGES table, that the identifier property maps to a column named MESSAGE_ID, that the text property maps to a column named MESSAGE_TEXT, and that the property named nextMessage is an association with many-to-one multiplicity that maps to a column named NEXT_MESSAGE_ID.
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class
name="hello.Message"
table="MESSAGES">
<id
name="id"
column="MESSAGE_ID">
<generator class="increment"/>
</id>
<property
name="text"
column="MESSAGE_TEXT"/>
<many-to-one
name="nextMessage"
cascade="all"
column="NEXT_MESSAGE_ID"/>
</class>
</hibernate-mapping>
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