Database access via OO

[Pramod]

Hi all,   Does any one know about any good Java OO implmentations using which direct database access from the middle layer can be avoided to the maximum ?     A vague explanation will be like - Middle layer coders will not be accessing database directly,  what they do is, create objects and establish relations between them (may be, using some other relating objects/structures). Later after establishing all required relations, they will call a "read"/"fetch" method of some high level relation object which will automatically (internally) construct the query/queries needed according to the previously set relations, and returns the objects. Sorry if its stupid/confusing. Even I dont have a clear idea on that. If u get what i mean, please help   thanks,   Pramod