Implement sql writer

Overview

For now tabulator support only stream.save(format='csv') to csv format. It’s pretty easy to implement sql writer just porting writers.csv.CSVWriter to writers.sql.SQLWrter.

What we’re aiming for:

from tabulator import Stream

with Stream('data.xls', headers=1) as stream:
  stream.save('postgresql://user:pass@host:5432/database', table='excel_export')

And of course it will be a pretty cool and useful feature 👍

Plan

• port writers.csv.CSVWriter to writers.sql.SQLWrter
• register new writer in config.py
• add writing tests to tests.formats.sql
• mention writing ability in readme sql format section

[eyalhei]

Hi, I would like to take a crack at this, is that OK?

[danfowler]

@akariv thanks! That helps so much with understanding how these pieces fit together 😄 .

/me rushing off to add some SQL connections strings to some YAML