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I'm working on a document-oriented database engine written purely in Python: BlitzDB! https://github.com/adewes/blitzdb https://github.com/adewes/blitzdb My m

I'm working on a document-oriented database engine written purely in Python: BlitzDB! https://github.com/adewes/blitzdb https://github.com/adewes/blitzdb My motivation was that I needed (wanted?) a pure-Python document database that does not have any dependencies (like pymongo) and provides querying capabilities similar to MongoDB. Currently, Blitz is under active development and comes with a file-based backend as well as a MongoDB backend. Contributions to the codebase and feedback are highly welcome :) The issue tracker contains various suggestions for contributions, with various difficulty levels: https://github.com/adewes/blitzdb/issues https://github.com/adewes/blitzdb/issues

cabalamat 12y ago
When this is used with a mongoDB backend, how much slower is it than just using pymongo?
- ThePhysicist 12y ago
  It depends ;) It's a very thin wrapper around MongoDB, so normally the performance penalty should not be too large. The biggest slowdown will come from inspecting a document class to see if other document classes are contained within it (which will be replaced by DB references).
chrismorgan 12y ago
Have you heard of ZODB? You might find it interesting to look at—perhaps you might even find it does all you want, and more.
- ThePhysicist 12y ago
  Yeah I know ZODB, but it's not what I want for several reasons: -Requires C extensions to run (makes it complicated to install on other systems) -Does not provide advanced querying capabilities (to my knowledge) -Does not have transparent references and lazy loading (to my knowledge) -Does not interoperate with MongoDB and other DB systems (to my knowledge) The nice thing about Blitz is that it allows me to switch from a file-based backend to MongoDB (and SQL in the future) without changing any of my code, and I can write stuff like this: al_pacino = backend.get(Actor,{'name' : 'Al Pacino'}) robert_de_niro = backend.get(Actor,{'name' : 'Robert de Niro'}) joint_movies = backend.filter(Movie,{'cast' : {'$all' : [al_pacino,robert_de_niro]}})
  - webmaven 12y ago
    I can debunk two of these right off the bat: Requires C extensions to run - Nope, there are pure-Python implementations as well. Does not provide advanced querying capabilities - Nope, https://pypi.python.org/pypi/zope.index https://pypi.python.org/pypi/zope.index, https://pypi.python.org/pypi/zope.app.catalog https://pypi.python.org/pypi/zope.app.catalog, http://docs.repoze.org/catalog/ http://docs.repoze.org/catalog/
    - ThePhysicist 12y ago
      Thanks for the clarification, ZODB sure is a very interesting project!
mahmoudimus 12y ago
Seconding ZODB

cabalamat 12y ago

When this is used with a mongoDB backend, how much slower is it than just using pymongo?

ThePhysicist 12y ago
It depends ;) It's a very thin wrapper around MongoDB, so normally the performance penalty should not be too large. The biggest slowdown will come from inspecting a document class to see if other document classes are contained within it (which will be replaced by DB references).

chrismorgan 12y ago

Have you heard of ZODB? You might find it interesting to look at—perhaps you might even find it does all you want, and more.

ThePhysicist 12y ago
Yeah I know ZODB, but it's not what I want for several reasons: -Requires C extensions to run (makes it complicated to install on other systems) -Does not provide advanced querying capabilities (to my knowledge) -Does not have transparent references and lazy loading (to my knowledge) -Does not interoperate with MongoDB and other DB systems (to my knowledge) The nice thing about Blitz is that it allows me to switch from a file-based backend to MongoDB (and SQL in the future) without changing any of my code, and I can write stuff like this: al_pacino = backend.get(Actor,{'name' : 'Al Pacino'}) robert_de_niro = backend.get(Actor,{'name' : 'Robert de Niro'}) joint_movies = backend.filter(Movie,{'cast' : {'$all' : [al_pacino,robert_de_niro]}})
- webmaven 12y ago
  I can debunk two of these right off the bat: Requires C extensions to run - Nope, there are pure-Python implementations as well. Does not provide advanced querying capabilities - Nope, https://pypi.python.org/pypi/zope.index https://pypi.python.org/pypi/zope.index, https://pypi.python.org/pypi/zope.app.catalog https://pypi.python.org/pypi/zope.app.catalog, http://docs.repoze.org/catalog/ http://docs.repoze.org/catalog/
  - ThePhysicist 12y ago
    Thanks for the clarification, ZODB sure is a very interesting project!

mahmoudimus 12y ago

Seconding ZODB