Re: [eclipselink-users] Preventing polymorphic selects in JPQL

[Christopher Delahunt <christopher.delahunt@xxxxxxxxxx>]

Hello Daniel,

JPA 2.0 also added the Type Expression, allowing you to filter queries 
using it.  For instance, the spec gives the following example:
"SELECT e
FROM Employee e
WHERE TYPE(e) IN (Exempt, Contractor)"

Best Regards,
Chris

On 18/11/2010 8:31 AM, Tom Ware wrote:
> Hi Daniel,
>
>   You can configure the InheritancePolicy on our ClassDescriptors not 
> to read subclasses.  To do this, create a DescriptorCustomizer for the 
> class you want to change the behavior of and call 
> descriptor.getInheritancePolicy().setShouldReadSubclasses(false).
>
> -Tom
>
> Maranan, Daniel wrote:
> > Hi Everyone,
> >
> >  
> >
> > Is there a way to prevent a select from producing the results of all 
> > of the subclasses of  a class? I only need the data from the super 
> > class.
> >
> >  
> >
> > Just for some background info, here is a small snipped of the super 
> > class. What I’m trying to access are names, postalAddresses, 
> > telephoneNumbers, and  emailAddresses. This class is the parent of 
> > several subclasses.
> >
> >  
> >
> > @Inheritance(strategy = InheritanceType./JOINED/)
> >
> > *public* *abstract* *class* _ConstituentEntity_ *implements* 
> > Constituent {
> >
> >  
> >
> >       @OneToMany(mappedBy = "constituent", targetEntity = 
> > NameEntity.*class*, fetch = FetchType./EAGER/)
> >
> >       @XmlTransient
> >
> >       *protected* Set<Name> names;
> >
> >  
> >
> >       @OneToMany(mappedBy = "constituent", targetEntity = 
> > PostalAddressEntity.*class*)
> >
> >       *protected* List<PostalAddress> postalAddresses;
> >
> >  
> >
> >       @OneToMany(mappedBy = "constituent", targetEntity = 
> > TelephoneNumberEntity.*class*)
> >
> >       *protected* List<TelephoneNumber> telephoneNumbers;
> >
> >  
> >
> >       @OneToMany(mappedBy = "constituent", targetEntity = 
> > EmailAddressEntity.*class*)
> >
> >       *protected* List<EmailAddress> emailAddresses;
> >
> >  
> >
> > Thanks,
> > Dan
> >
> >
> > ------------------------------------------------------------------------
> >
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