Dear all, I hava a simple relationship for company and car.

companyVo.hbm.xml
<class name="emo.poc.model.vo.CompanyVo" table="company"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false">

<id name="uid" type="integer">
<generator class="increment" />
</id>

<property name="name" type="string" >
<column name="name" length="50" sql-type="NVARCHAR(50)" />
</property>
<set name="cars" lazy="false" cascade="all"
inverse="true" fetch="join">
<key column="compId" />
<one-to-many class="emo.poc.model.vo.CarVo"/>
</set>

</class>

Carvo.hbm.xml
<class name="emo.poc.model.vo.CarVo"
table="car"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false">

<composite-id>
<key-property name="compId" type="integer" />
<key-property name="carId" type="integer" />
</composite-id>

<property name="name" type="string" >
<column name="name" length="50" sql-type="NVARCHAR(50)" />
</property>

</class>

I want insert a company with its car into tables.
CompanyVo companyVo = new CompanyVo();
companyVo.setInsert(true);
companyVo.setName("n1");
CarVo carVo = new CarVo();
carVo.setCarId(1);
carVo.setName("cn");
Set cars = new HashSet();
cars.add(carVo);
carVo.setInsert(true);
companyVo.setCars(cars);
personBo.saveCompany(companyVo);

from the company's set(one-to-many) I have let the compId as a key, and its value should be same as company's id.
However,
after insert, they all insert one data in tables, but the uid of company is not set to car's compId, which mean car's compId is null, carId is 1...
Can some body tell me why, and please tell me how to let car's compId same as company's uid.

Thank you very much.[

Are you setting both properties in the relationship, so calling the setter on both the owned, and the owning class? I'd bet that is not happening.

Also, have you set up a cascade type for the relationship? You might want to look at setting up a CascadeType.ALL setting somewhere, although I'm not sure if that would help in this particular scenario.

Here's a helpful tutorial on object relational mappings from Wikipedia:

http://en.wikipedia.org/wiki/Object-relational_mapping

Also, I have some free tutorials on implementing simple many-to-one mappings if you're interested:

http://www.hiberbook.com/HiberBookWeb/learn.jsp?tutorial=18mappingonetomanyassociations

-Cameron McKenzie