This paper introduces a policy-based slicing of Hibernate Query Language (HQL) based on a refined notion of dependence graph. The policies are defined on persistent objects, rather than transient objects, which are stored in an underlying database. We extend the Class Dependence Graph (ClDG) of object-oriented languages to the case of HQL, and we refine it by applying semantics-based Abstract Interpretation framework. This leads to a slicing refinement of HQL programs, producing more precise slices w.r.t. policies and we refine by using semantics equivalence, according to the Abstract Interpretation framework.