montydb 1.0.2

MongoDB's unofficial Python implementation.

Monty, Mongo tinified. A literally serverless, Mongo-like database in Python

:construction: Not Ready For Prime Time :construction:

Inspired by TinyDB and the extension TinyMongo.

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MontyDB is:

• A serverless version of MongoDB, against to MongoDB 3.6.4
• Document oriented, of course
• Storage engine pluggable
• Write in pure Python, works on Python 2.7, 3.4, 3.5, 3.6

Install

pip install montydb

Requirements

• pymongo (for bson)

Example Code

>>> from montydb import MontyClient
>>> col = MontyClient(":memory:").db.test
>>> col.insert_many([{"stock": "A", "qty": 6}, {"stock": "A", "qty": 2}])

>>> cur = col.find({"stock": "A", "qty": {"$gt": 4}})
>>> next(cur)
{'_id': ObjectId('5ad34e537e8dd45d9c61a456'), 'stock': 'A', 'qty': 6}

Develop Status

See Projects' TODO

Storage Engine Configurations

The configuration process only required on repository creation or modification.

Currently, one repository can only assign one storage engine.

• Memory

Memory storage does not need nor have any configuration, nothing saved to disk.

>>> from montydb import MontyClient
>>> client = MontyClient(":memory:")

• FlatFile

FlatFile is the default on-disk storage engine.

>>> from montydb import MontyClient
>>> client = MontyClient("/db/repo")

FlatFile config:

[flatfile]
cache_modified: 0  # how many document CRUD cached before flush to disk.

• SQLite

SQLite is NOT the default on-disk storage, need configuration first before get client.

>>> from montydb import set_storage, MontyClient
>>> set_storage("/db/repo", storage="sqlite")
>>> client = MontyClient("/db/repo")

SQLite config:

[sqlite]
journal_mode: WAL

SQLite write concern:

>>> client = MontyClient("/db/repo",
>>>                      synchronous=1,
>>>                      automatic_index=False,
>>>                      busy_timeout=5000)

Utilities

• monty_dump

  Write documents to disk, able to load by monty_load or mongoimport

  >>> from montydb.utils import monty_dump
  >>> documents = [{"a": 1}, {"doc": "some doc"}]
  >>> monty_dump("/path/dump.json", documents)
  

• monty_load

  Read documents from disk, able to read from monty_dump or mongoexport

  >>> from montydb.utils import monty_load
  >>> monty_load("/path/dump.json")
  [{"a": 1}, {"doc": "some doc"}]
  

• MontyList

  Experimental, a subclass of list, combined the common CRUD methods from Mongo's Collection and Cursor.

  >>> from montydb.utils import MontyList
  >>> mtl = MontyList([1, 2, {"a": 1}, {"a": 5}, {"a": 8}])
  >>> mtl.find({"a": {"$gt": 3}})
  MontyList([{'a': 5}, {'a': 8}])
  

  You can dump it with monty_dump or read from monty_load

  >>> monty_dump("/path/dump.json", mtl)
  >>> MontyList(monty_load("/path/dump.json"))
  MontyList([1, 2, {'a': 1}, {'a': 5}, {'a': 8}])
  

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