opaleye-classy (hackage): Classy MTL extension of the lovely Opaleye library, which simply just wraps things up in a MonadReader , MonadError context where the config & error are constrained by Classy Lenses & Prisms rather than by concrete types  More info on this pattern can be found in George Wilson's BFPG talk : http://talks.bfpg.org/talks/2015-06-09.next_level_mtl.html  Note: This API may not be complete. If you need other functions exported then let me know or drop in a PR  Also Note: This is only useful if you only have one DB in your transformer stack. :)
Keywords: database|library|mit