This library provide a Simple and Extensible access to PostgreSQL.

Simple: Poseidon runs a SQL query and returns a set of custom datatype. **It is not an ORM.**

Extensible: As a user of the library, you can map your custom PostgreSQL type to your Haskell datatype easily, in a pluggable way (e.g. if you're using postgis, you will be most likely interested by poseidon-postgis, that maps GeoJSON WKT to GeospatialGeometry).