Re: Hibernate mapping problem of parent

From:
 David Portabella <david.portabella@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 09 Sep 2007 15:24:11 -0000
Message-ID:
<1189351451.191484.6300@22g2000hsm.googlegroups.com>
On Sep 9, 1:04 pm, "sss.z...@gmail.com" <sss.z...@gmail.com> wrote:

The mapping attributeparent="xxx" doesn't work

Hibernate Version: version 3.2.5

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

<hibernate-mapping package="parenttest">
   <class name="Parent" table="PARENT">
      <id name="id" column="PARENT_ID" type="long">
         <generator class="native"/>
      </id>
      <property name="name" column="NAME" type="string"/>

      <set name="Childs" table="CHILDS">
         <key column="CHILD_ID"/>
         <composite-element class="Child">
            <parent name="Parent"/>
            <property name="username" column="ADDED_BY_USER"
type="string"/>
         </composite-element>
      </set>
   </class>
</hibernate-mapping>

But I get the Child.java class source file by hbm2java.

packageparenttest;
// Generated 2007-9-9 17:42:40 by Hibernate Tools 3.2.0.b9

/**
 * Child generated by hbm2java
 */
public class Child implements java.io.Serializable {

     private String username;

    public Child() {
    }

    public Child(String username) {
       this.username = username;
    }

    public String getUsername() {
        return this.username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

}

The code ofParent.java is OK.

So what's wrong with the mapping files? I want the Child to have the
getter and setter ofparent. I see theparenttag do this work in
hibernate document.

   privateParentparent;
   publicParentgetParent() {
      returnparent;
   }

   public void setParent(Parentparent) {
      this.parent=parent;
   }


I don't understand your line:
   <parent name="Parent"/>

Is "parent" a valid element in the hibernate config?
To get the effect you asked, you could substitute the previous line
by:

   <many-to-one name="parent" class="parenttest.Parent"
column="PARENT_ID"/>

HTH,
DAvid

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