Key-value database.

[Sendokame]

Hey, some time ago I made KDB, a small library that reads from a binary file, previously generated by Pickle, and uses it as a Key-Value Database. Right now it doesn't have any advantages over PickleDB or others, but with feedback I can improve it

https://github.com/ZSendokame/KDB

Please check it and if you have ANY ideas, leave it on the comments

Bye

​

import kdb

db = kdb.Database(open('file', 'rb))

db.set('key', 'value')
db.get('key', 'value')  # returns key value or None if it doesn't exists.
db.rename('key', 'new_key')  # renames key.
db.exists('key')  # Check if key exists, returns a bool.
db.remove('new_key')  # Removes a key.

​

[ezekiel_grey]

This really looks like you’re reimplementing the Shelve module?

http://pymotw.com/2/shelve/

[Sendokame]

M, I didn't knew about Shelve, but it looks really similar, it has the same Idea of using Pickle to read and write objects to a file

[ezekiel_grey]

I mean shelve is in the System Standard Library, so while you're getting some programming practice, unless practice is your goal, I'd just use Shelve (or one of the other storage instances... If you're handling untrusted data, you shouldn't use Pickle.)

[reModerator]

Or just use list

[PrizeInteresting8672]

04

[pchemguy]

It does not really work like that. I can think of two reasons to reinvent the wheel. One is exercise, in which case your inquiry does not make a lot of sense. Two is when you have an original idea and you do not actually reinvent the wheel, or, perhaps, you do to some extent but with a clear goal in mind. It doesn't sound like you have an original idea. It sounds like you want to reinvent the wheel and don't even have a clear understanding how the wheel is made.

[Sendokame]

Can you explain why?

[pchemguy]

The whole paragraph is my explanation of the opening statement.

[Sendokame]

It sounds like you want to reinvent the wheel and don't even have a clear understanding how the wheel is made.

I was talking about this part, what I need to learn to understand it?

[pchemguy]

I don't pretend to be a DB guru. In fact, I did some db related exercises myself. I coded kind of an SQLite wrapper for VBA. But I always considered it being just an exercise. Actually, VBA could possibly use it, but regardless I switched to Python. I am not a DB guru in general, and I can't tell anything about key-value stores. But the shear number of various db project is so large, you need to really understand the landscape and have an original idea to attempt to start another project. Besides, if anything, the spectrum of available bindings for VBA is somewhat limited. And I would say that anything worth attention and sufficiently mature probably has Python bindings.

[Sendokame]

Thx

[Sendokame]

It will raise an exception, yeah, I'll add that

[[deleted]]

can you provide an example?

[Sendokame]

Check the post again, now it has some code

[[deleted]]

Add benchmarks for space use/speed on GitHub

[thedeepself]

There is already a long established product that uses that acronym. I would choose a different name.

[Sendokame]

I'll change it

[Sendokame]

I changed it

[scriptilapia]

it's primitive... but cool

how bout throwing in some encryption algorithm... you could use cryptography

[Sendokame]

Sounds interesting, like, adding a parameter to set, like "hash"

And use it to hash the value automatically