Support to generate the schema file from database

[quangvo09]

I think this library will be greater when it supports to generate the schema file from tables in the database

It's useful for a new project with the existing database. Hope you consider to implement it :)

[ttpho]

@quangvo09 Thank you for your suggestion but I think it is over my time.
I think I will consider parser complex JSON and filed type special as Date,...