The Doctrine Project is the home to several PHP libraries primarily focused on database storage and object mapping. The core projects are a Object Relational Mapper (ORM) and the Database Abstraction Layer (DBAL) it is built upon.
Sick of ORM and schemas? select gets right to the point!
Supported databases:
MySQL MongoDB Planned: PostgreSQL, SQLite, CouchDB Researching: Riak, Redis, selector language