This repository

This is an intent to port CodernityDB to Python 3, from de original source, written for Python 2.x,

CodernityDB is opensource, pure python (no 3rd party dependency), fast (really fast check Speed in documentation if you don't believe in words), multiplatform, schema-less, NoSQL_ database. It has optional support for HTTP server version (CodernityDB-HTTP), and also Python client library (CodernityDB-PyClient) that aims to be 100% compatible with embeded version.

Although this port is a beta yet, it works in the basic usage cases.

Calling for help

Any help to port CodernityDB to Python 3 is wellcome. It's a hard works.

Feel free to clone the repo an send any patch.

Status

Following the official examples, I was able to determinate:

• Insert/Save: Works oks!
• Get query: Works oks!
• Duplicates: Works oks!
• Update/delete: Doesn't works yet.
• Ordered data: Doesn't works yet.

Ported examples

There he ported examples:

Insert/Save

.. code-block:: python

from CodernityDB3.database import Database

def main():
    db = Database('/tmp/tut1')
    db.create()
    for x in range(100):
        print(db.insert(dict(x=x)))
    for curr in db.all('id'):
        print(curr)

main()

Get query

.. code-block:: python

from CodernityDB3.database import Database
from CodernityDB3.hash_index import HashIndex


class WithXIndex(HashIndex):

    def __init__(self, *args, **kwargs):
        kwargs['key_format'] = 'I'
        super(WithXIndex, self).__init__(*args, **kwargs)

    def make_key_value(self, data):
        a_val = data.get("x")
        if a_val is not None:
            return a_val, None
        return None

    def make_key(self, key):
        return key


def main():
    db = Database('/tmp/tut2')
    db.create()
    x_ind = WithXIndex(db.path, 'x')
    db.add_index(x_ind)

    for x in range(100):
        db.insert(dict(x=x))

    for y in range(100):
        db.insert(dict(y=y))

    print(db.get('x', 10, with_doc=True))        

if __name__ == '__main__':
    main()

Duplicates

.. code-block:: python

from CodernityDB3.database import Database
from CodernityDB3.hash_index import HashIndex


class WithXIndex(HashIndex):

    def __init__(self, *args, **kwargs):
        kwargs['key_format'] = 'I'
        super(WithXIndex, self).__init__(*args, **kwargs)

    def make_key_value(self, data):
        a_val = data.get("x")
        if a_val is not None:
            return a_val, None
        return None

    def make_key(self, key):
        return key


def main():
    db = Database('/tmp/tut3')
    db.create()
    x_ind = WithXIndex(db.path, 'x')
    db.add_index(x_ind)

    for x in range(100):
        db.insert(dict(x=x))

    for x in range(100):
        db.insert(dict(x=x))

    for y in range(100):
        db.insert(dict(y=y))

    print(db.get('x', 10, with_doc=True))
    for curr in db.get_many('x', 10, limit=-1, with_doc=True):
        print(curr)

if __name__ == '__main__':
    main()

Update/delete

.. code-block:: python

from CodernityDB3.database import Database
from CodernityDB3.tree_index import TreeBasedIndex


class WithXIndex(TreeBasedIndex):

    def __init__(self, *args, **kwargs):
        kwargs['node_capacity'] = 10
        kwargs['key_format'] = 'I'
        super(WithXIndex, self).__init__(*args, **kwargs)

    def make_key_value(self, data):
        t_val = data.get('x')
        if t_val is not None:
            return t_val, None
        return None

    def make_key(self, key):
        return key


def main():
    db = Database('/tmp/tut_update')
    db.create()
    x_ind = WithXIndex(db.path, 'x')
    db.add_index(x_ind)

    # full examples so we had to add first the data
    # the same code as in previous step

    for x in range(100):
        db.insert(dict(x=x))

    for y in range(100):
        db.insert(dict(y=y))

    # end of insert part

    print(db.count(db.all, 'x'))

    for curr in db.all('x', with_doc=True):
        doc = curr['doc']
        if curr['key'] % 7 == 0:
            db.delete(doc)
        elif curr['key'] % 5 == 0:
            doc['updated'] = True
            db.update(doc)

    print(db.count(db.all, 'x'))

    for curr in db.all('x', with_doc=True):
        print(curr)

if __name__ == '__main__':
    main()

Ordered

.. code-block:: python

from CodernityDB3.database import Database
from CodernityDB3.tree_index import TreeBasedIndex


class WithXIndex(TreeBasedIndex):

    def __init__(self, *args, **kwargs):
        kwargs['node_capacity'] = 10
        kwargs['key_format'] = 'I'
        super(WithXXIndex, self).__init__(*args, **kwargs)

    def make_key_value(self, data):
        t_val = data.get('x')
        if t_val is not None:
            return t_val, data
        return None

    def make_key(self, key):
        return key


def main():
    db = Database('/tmp/tut4')
    db.create()
    x_ind = WithXIndex(db.path, 'x')
    db.add_index(x_ind)

    for x in range(11):
        db.insert(dict(x=x))

    for y in range(11):
        db.insert(dict(y=y))

    print(db.get('x', 10, with_doc=True))

    for curr in db.get_many('x', start=15, end=25, limit=-1, with_doc=True):
        print(curr)


if __name__ == '__main__':
    main()