If you want to develop your own SQL parser, I'll recommend a PEG design parser. I've used a PEG parser for a compile-to-js/compile-to-c language, and it resulted into a much clear and easy to mantain code. Check: https://github.com/luciotato/LiteScript
You can start from LiteScript parser if: a) this parser is a important part of your application, b) eventually you'll need native-exe-speed parsing.
But if this is not a important part of the application you're developing, contributing to a existent specific sql parser could be the best choice.
