Composite-Id

richi12 · **Joined:** Sat Jan 17, 2004 7:59 pm **Posts:** 4

I have a Parent table Basic and child table Family and the .hbm.xml files look like this

<hibernate-mapping>
<class name="Basic" table="basic">
<id name="id" type="int" unsaved-value="null" >
<column name="basicid" sql-type="int"
not-null="true"/>
<generator class="increment"/>

</id>
...
<many-to-one name="fam" class="Family">
<column name="areaid"/>
<column name="familyid"/>
</many-to-one>
</class>
</hibernate-mapping>

and my Family file

<class name="Family" table="family">
<composite-id>
<key-property name="area" column="areaid"
type="int" length="3" />
<key-property name="familyid" column="familyid"
type="int" length="7" />
</composite-id>
...
<many-to-one name="famBasic" not-null="true"/>

</class>
</hibernate-mapping>

how do i define family in my .java file does some one have a good example for guide
Thanks in advance.[/list]

emmanuel · **Posted:** Tue Feb 03, 2004 6:29 am

First it seems one of the side should be one-to-many (family one I guess) to mirror the other many-to-one.

But in your context:

Code:

Family {
Integer area;

Integer familyid;

public Integer getArea() {
  ...
}
// setter associated

//same for familyid

private Basic basic;

public Basic getBasic() {
 return basic;
}
...

For a proper one-to-many mapping, check the parent-child relationship chapter.