itemdb

The itemdb library allows you to store and retrieve Python dicts in a database on the local filesystem, in an easy, fast, and reliable way.

Based on the rock-solid and ACID compliant SQLite, but with easy and explicit transactions using a with statement. It provides a simple object-based API, with the flexibility to store (JSON-compatible) items with arbitrary fields, and add indices when needed.

This lib was originally part of the TimeTurtle time tracker and is also used in MyPaaS.

Installation

pip install itemdb

Quick usage example

import itemdb

# Open the database and make sure there is a table with appopriate indices
db = itemdb.ItemDB(":memory:")
db.ensure_table("persons", "!name", "age")

# Add some items to the db
with db:
    db.put_one("persons", name="Jane", age=22)
    db.put_one("persons", name="John", age=18, fav_number=7)
    db.put("persons", {"name": "Guido"}, {"name": "Anne", "age": 42})

# Update an item
with db:
    db.put_one("persons", name="John", age=19, fav_number=8)

# Query items
db.count_all("persons")  # -> 4
db.select("persons", "age > ?", 20)  # -> list of 2 items

See the guide for details.

Async

The AsyncItemDB class provides the same API, but async:

import itemdb

db = await itemdb.AsyncItemDB(":memory:")
await db.ensure_table("persons", "!name", "age")

async with db:
    await db.put_one("persons", name="Jane", age=22)

...

Alternatively, a decorator is provided to turn a normal function into an async one (running in a separate thread).

@asycify
def your_db_interaction_logic(...):
    db = ItemDB(filename)
    ...

async def your_async_code(...):
    await your_db_interaction_logic(...)

License

MIT

Developers

• Run black . to autoformat.
• Run flake8 . --max-line-length=99 to lint.
• Run pytest . to run unit tests.