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'''
A class with the specific intent of making
database actions easy & decluttered.
Verified: 2021 February 7
* Follows PEP8
* Tested Platforms
* Windows 10
'''
from server.state import ServerStatic
import sqlite3
import os
class Database:
__DATABASE_FN = 'database.db'
def __init__(self):
if not os.path.isdir(ServerStatic.ARCHIVE_DIR):
os.makedirs(ServerStatic.ARCHIVE_DIR, exist_ok=True)
self.__conn = sqlite3.connect(os.path.join(
ServerStatic.ARCHIVE_DIR,
Database.__DATABASE_FN))
self.__cursor = self.__conn.cursor()
def commit(self):
self.__conn.commit()
def close(self):
self.__conn.close()
def execute(self, sql, values=()):
self.__cursor.execute(sql, values)
def create_table(self, table, **kwargs):
self.__cursor.execute(
'CREATE TABLE IF NOT EXISTS '
'{} ({}, UNIQUE ({}) ON CONFLICT IGNORE)'.format(
table, Database.parse(kwargs), ','.join(kwargs)))
def read(self, table, fields=('*',), fetch=0, condition=()):
self.__cursor.execute('SELECT {} FROM {}{}'.format(
','.join(fields), table, (' WHERE {}{}?'.format(
*condition[:2]) if condition else '')
), (condition[2],) if condition else condition)
if fetch > 0:
return self.__cursor.fetchmany(fetch)
else:
return self.__cursor.fetchall()
def write(self, table, values):
self.__cursor.execute('INSERT INTO {} VALUES ({})'.format(
table, ','.join(tuple('?' * len(values)))), values)
def update(self, table, condition, **kwargs):
self.__cursor.execute('UPDATE {} SET {} WHERE {}{}?'.format(
table, Database.parse({
key: '?' for key in kwargs
}, '='), *condition[:2]
), list(kwargs.values()) + [condition[2]])
def delete(self, table, condition):
self.__cursor.execute('DELETE FROM {} WHERE {}{}?'.format(
table, *condition[:2]), (condition[2],))
@staticmethod
def parse(dictionary, seperator=' '):
return ','.join((key + seperator + value
for key, value in dictionary.items()))
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