FluentPDO is small PHP library for rapid query building. Killer feature is "Smart join builder" which generates joins automatically. FluentPDO is a perfect choice for small and large projects.
FlunetPDO is database library for quick prototyping your SQL.
All features of FluentPDO are covered by tests so don't afraid to use FluentPDO in your projects. Spite of it if you find a bug add issue on github.