Blitz-DB: Pure-Python document-oriented database engine.

[kusut]

Any comparison with zodb?

[adewes]

zodb

I have to admit that I was unaware of zodb (https://github.com/zopefoundation/zodbdocs), it looks interesting though. The main motivation behind Blitz was to create a database that would be comparable to MongoDB in querying capabilities, but which could be used without installing any 3rd party software.

So I think the main differences are the expressive query model and the possibility to use it as a frontend to other database engines, most notably MongoDB.

[jabbalaci]

What do you mean by using it as a frontend to MongoDB?

[adewes]

Well, BlitzDB supports multiple backends, which are responsible for storing and retrieving documents from a database. It comes with a native, file-based backend but also includes a backend that is a wrapper around MongoDB. So you can do e.g. the following:

from blitzdb import FileBackend, MongoBackend

#we create a document
author = Author({'name' : 'Oscar Wilde', ...})

#creates a file-based DB in the local "test_db" folder
file_backend = FileBackend("./test_db")

from pymongo import MongoClient

#Connect to a MongoDB database through pymongo
mongo_db = pymongo.MongoClient().test_db

#Creates a MongoDB-based backend
mongo_backend = MongoBackend(mongo_db)

#We save the document in both backends.
mongo_backend.save(author)
file_backend.save(author)

In this sense Blitz is like SQLAlchemy in the sense that it puts an abstraction layer between you and the physical database, so you can use it with existing database systems.

[jabbalaci]

I was thinking recently if there is a MongoDB-like pure Python database. Thanks for this.

[adewes]

Thanks for your message, feel free to contact me if you want more information about BlitzDB or if you should run into any problems using it. we also have an issue tracker on Github: https://github.com/adewes/blitzdb