Support raw SQL Alchemy

[dtheodor]

This is an attempt to fix #71.

It adds a new argument sqlalchemy_engine to DebugToolbarExtension(app, sqlalchemy_engine=None). If no engine is passed, the old behavior is maintained. If an engine is passed, then the query recording events are installed on that engine and no flask-sqlalchemy db is touched. The event registration still uses flask-sqlalchemy code.

This still requires flask-sqlalchemy to be installed in order to record queries, but it does not require the user to use it to declare models and query for data; raw sqlalchemy engines and tables can be used instead. I added a basic app example that uses plain sql alchemy under basic_app_raw_sqlalchemy.py

[a-urth]

What about this request? Does actually this extension is maintained by someone?
Me also highly interested in debug toolbar without flask sqlalchemy.

[mgood]

Sorry, yes I've been rather behind on the maintenance of this project. I'll follow up on the original issue #71 with some thoughts on this.

[kxxoling]

Would be great to support raw SQLAlchemy. I have a app built on Flask for web and Tornado for IM and push service, and I reused the model layer on raw SQLAlchemy.
Would be nice to hear raw SQLAlchemy support!

[eMerzh]

any news of this front ?
something needed to be fixed for the review ?

[illume]

There's a conflict now.

[jeffwidman]

I would like to add support for raw SQLAlchemy here. It's been a while since this was looked at though, so I'm not sure what changes are needed... @dtheodor do you mind rebasing to fix merge conflicts so we get a clean slate for testing/discussing the actual implementation?

[josegonzalez]

For anyone that wants this sort of functionality, a separate python module exists called fdt-sqlalchemy. It has a bug where there is an errant print, which I've removed and documented a workaround for here.

[macnewbold]

I know it's been a long time, but do you still have any interest in this?
If so, it will need to catch it up with master and retest. If not, we'll probably close it out.
Is it safe to say this one should be superseded by #110 ?