DB_Adapter PHP library is an elegant database abstraction layer for MySQL, PgSQL, Firebird and SQLite. It supports several types of handy and secure placeholders and provide comfortable debugging. Offsite: http://db-adapter.in-source.ru/
- PHP5 way library without excess weight
- SQL-injection security
- Cool debug system with query statistics and logging
- Smart placeholders for elegant queries
- Unified interface for MySQL, PostgreSQL, Ibase etc...
I am a developer of this project, but I really use it in my work, and all my company does. Now, it works only with MySQL and have some bugs, but I recommend it.