lemondb 0.0.3b0

Simple and lightweight document oriented database

LemonDB

Development Status: Beta

Simple ang lightweight document oriented database written in pure Python 3 (3.9)

Examples

Data insertion Example:

from lemondb import LemonDB
db = LemonDB('db')
db.insert({'name': 'John Doe'})

Query Example

LemonDB.Search can accept 3 types of parameters:

• Standard Query class
• Regular Expression
• Lambda Functions

from lemondb import LemonDB
from lemondb import Query
db = LemonDB('db')
db.insert_many([
  {'name': 'John Doe'},
  {'name': 'Elizabeth Doe'}
])

data = db.search(query.name == 'John Doe')
print(data)
# Output: John Doe

#: Using lambda
data = db.search(lambda x: x['name'] == 'John Doe')
print(data)
# Output: John Doe

#: Using regular expression
data = db.search(
  query='^J(.*?)e$' #: Match when the first string is J and endswith e
)
print(data)
# Output: John Doe

Encrypted LemonDB

You can use Sidle Encryption within the LemonDB. Just use the SidleMiddleware and SidlePlugin

from lemondb import LemonDB
from lemondb.middleware import SidleMiddleware
from lemondb.plugin import SidlePlugin

db = LemonDB(
  name = 'sidle_db',
  middleware_cls = SidleMiddleware(password='password123'),
  plugin_cls = SidlePlugin
)

db.insert({'name': 'John Doe'})

Creating Middlewares & Plugins

By creating middleware, you need to use the base class lemondb.middleware.base.BaseMiddleware. The BaseMiddleware class handle all operation like read, write and delete. While plugins handle the initializing of the database operation and it is called whenever the LemonDB instance is initialized.

Just make sure to create a class based on the BaseClasses and inherit all functions, if the methods/functions are not inherited properly, it will throw an NotImplementedError.

Finally,you can call your custom middleware or plugin using the plugin_cls and middleware_cls parameter for the database. The default value is JsonMiddleware and LemonPlugin. Here is the example

from lemondb import LemonDB
from middleware import CustomMiddleware
from plugin import CustomPlugin

db = LemonDB(
  name='db.json',
  middleware_cls=CustomMiddleware,
  plugin_cls=CustomPlugin
)