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Understanding associations

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vishyanand

Post subject: Understanding associations

Posted: Mon Jul 17, 2006 12:01 pm

Beginner

Joined: Fri Jul 07, 2006 12:08 pm
Posts: 37

I have TransportPackage entity which has a collection of VehicleRates..A transportpackage can have 1-many rates,and a vehiclerate belongs to only one package
TrasnportPackage structure...
-------packageid,name,<IList>VehiceRates,description

VehicleRate structure
-------id,packageid,vehicleid,rate

i have mapped it as..in TransportPackage.hbm..

Code:

<bag name ="m_VehicleHireRateCollection" access ="field" inverse ="true" table="TransportPackageVehicleRates">
      <key column ="TransportPackageID"></key>

      <one-to-many class ="VehicleHireRate" />
      
    </bag>

and in

VehicleRate.hbm..

Code:

 <many-to-one class ="TransportPackage" column ="TransportPackageID" name ="m_TransportPackage" access ="field"></many-to-one>   

now,when I add new vehicle rate to a package,i am doing this..

Code:

vehicle.package=package
package.add(vehiclerate)
session.save(vehiclerate)

...it is working..but i feel it is wrong..
i want this should happen..

Code:

vehicle.package=package
package.add(vehiclerate)
session.save(vehiclerate)

...i.e saving vehicle rate through a package object.. how to achieve this? what am i doing wrong?

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devonl

Post subject:

Posted: Mon Jul 17, 2006 4:05 pm

Expert

Joined: Fri May 13, 2005 5:56 pm
Posts: 308
Location: Santa Barbara, California, USA

i think you mean you want to do:

Code:

vehicle.package=package
package.add(vehiclerate)
session.save(package)

instead of:

Code:

vehicle.package=package
package.add(vehiclerate)
session.save(vehiclerate)

you need to add the "cascade" attribute to your package collection:

Code:

<bag
   name="m_VehicleHireRateCollection"
   access="field"
   inverse ="true"
   table="TransportPackageVehicleRates"
   cascade="all-delete-orphan">

   <key column ="TransportPackageID"></key>
   <one-to-many class ="VehicleHireRate" />
</bag> 

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