About iAuxSQL (C++ SQL database API library)
A high-performance and cross-platform C++ SQL database API library which provides unified interface to the popular SQL database engines, such as: MySQL, PostgreSQL, Oracle, SQLite.

Features:
- Supports databases: MySQL (4.1, 5.0, 5.1, 5.4, +), PostgreSQL (8.2+), Oracle (10.2+), SQLite (built-in: latest), with single unified interface.
- Mobile platforms: iPhone and Windows Mobile 6.
- Supports transactions with additional internal implementation.
- Proxy service - database communication abstraction layer.
- Many more features.

Read more: http://www.apple.com/downloads/macosx/development_tools/iauxsqlcsqldatabaseapilibrary.html