Hello,

I am working on Hibernate DetachedCriteria objects to build queries.

I want to know if there is a way to remove an already specified Restriction on a DetachedCrtiteria.



I want to remove this restriction. Can this be done?

TIA,
Advait

I don't think so. Download the source code and look at org.hibernate.impl.CriteriaImpl. You can cast your Criteria object to a CriteriaImpl and get further control over it, but I don't see methods for modifying it in the way you want.

What's your reason for modifying it? Are you caching it and trying to reuse it? If so, you may want to store an intermediate object instead such as a list of Restrictions and then just recreate the Criteria as needed.

Thanks for the reply.

As far as need and implementation is concernced, assume that there is a API that dynamically gives me DetachedCriteria object build based on some query parameters. Now what i want is to filter this and remove some of the Restrictions.

I know this might not make any sense, but the intermidiate API we are using is mandatory. And we get control of DetachedCtiteria once this API builds it.

So do you think there is any way to do so. Or else, Are you very much sure that this is not possible? If so i need to think of some alternatives/workaround.

Thanks,
~Advait

I can't say I'm 100% sure you can't do it, but I don't know a way and the API for Criteria and DetachedCriteria don't have methods for modifying the restrictions you already have added.

I do something similar to what you want to do. In my case I have a web interface and the page is backed by a default criteria with several restrictions in it. The user can then decide to add additional restrictions to the query or remove some of the ones already there. In these cases, I cache a list of the restrictions they want and a list of the columns (projections in hibernate terminology) they want. I then reconstruct the actual Criteria instance with each servlet request that comes in by adding to or removing entries from these lists.