Database module (#17)
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Co-authored-by: mitsuha_s <stmiroslavsckaya@yandex.ru>
Reviewed-on: #17
Reviewed-by: Alexey Skobkin <skobkin-ru@ya.ru>
This commit is contained in:
Miroslavsckaya 2022-05-29 23:19:17 +03:00
parent 04bdbbe79c
commit 22dcc4ef06
2 changed files with 79 additions and 0 deletions

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.gitignore vendored
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# Python # Python
/.venv /.venv
# Database
/*.db

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database.py Normal file
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import sqlite3
"""
Classes:
Database - implement intercaction with the database.
"""
class Database():
"""Implement intercaction with the database."""
def __init__(self, path: str) -> None:
"""Create a database file if not exists."""
self.conn = sqlite3.connect(path)
self.cur = self.conn.cursor()
self.cur.execute('CREATE TABLE IF NOT EXISTS users (id INTEGER, telegram_id NUMERIC NOT NULL UNIQUE, PRIMARY KEY(id))')
self.cur.execute('CREATE TABLE IF NOT EXISTS feeds (id INTEGER, url TEXT NOT NULL UNIQUE, PRIMARY KEY(id))')
self.cur.execute('CREATE TABLE IF NOT EXISTS subscriptions (user_id INTEGER, feed_id INTEGER, UNIQUE (user_id, feed_id), FOREIGN KEY(user_id) REFERENCES users(id), FOREIGN KEY(feed_id) REFERENCES feeds(id))')
self.cur.execute('CREATE TABLE IF NOT EXISTS feeds_last_items (feed_id INTEGER, url TEXT NOT NULL UNIQUE, title TEXT, description TEXT, date NUMERIC, FOREIGN KEY(feed_id) REFERENCES feeds(id))')
def add_user(self, telegram_id: str) -> int:
"""Add a user's telegram id to the database and return its database id."""
self.cur.execute('INSERT INTO users (telegram_id) VALUES (?)', [telegram_id])
self.conn.commit()
return self.cur.lastrowid
def find_user(self, telegram_id: str) -> int | None:
"""Get a user's telegram id and return its database id."""
self.cur.execute('SELECT id FROM users WHERE telegram_id = ?', [telegram_id])
row = self.cur.fetchone()
if row is None:
return None
return row[0]
def add_feed(self, url: str) -> int:
"""Add a feed to the database and return its id."""
self.cur.execute('INSERT INTO feeds (url) VALUES (?)', [url])
self.conn.commit()
return self.cur.lastrowid
def subscribe_user(self, user_id: int, feed_id: int) -> None:
"""Subscribe a user to the feed."""
self.cur.execute('INSERT INTO subscriptions (user_id, feed_id) VALUES (?, ?)', [user_id, feed_id])
self.conn.commit()
def unsubscribe_user(self, user_id: int, feed_id: int) -> None:
"""Unsubscribe a user from the feed."""
self.cur.execute('DELETE FROM subscriptions WHERE feed_id = ? AND user_id = ?', [feed_id, user_id])
self.conn.commit()
def delete_feed(self, feed_id: int) -> None:
"""Delete a feed."""
self.cur.execute('DELETE FROM feeds WHERE id = ?', [feed_id])
self.conn.commit()
def find_feeds(self) -> list:
"""Get a list of feeds."""
self.cur.execute('SELECT * FROM feeds')
return self.cur.fetchall()
def find_user_feeds(self, user_id: int) -> list:
"""Return a list of feeds the user is subscribed to."""
self.cur.execute('SELECT * FROM feeds WHERE id IN (SELECT feed_id FROM subscriptions WHERE user_id = ?)', [user_id])
return self.cur.fetchall()
def find_feed_items(self, feed_id: int) -> list:
"""Get last feed items."""
self.cur.execute('SELECT * FROM feeds_last_items WHERE feed_id = ?', [feed_id])
return self.cur.fetchall()
def update_feed_items(self, feed_id: int, new_items: list) -> None:
"""Replace last feed items with a list items that receive."""
for i in range(len(new_items)):
new_items[i] = (feed_id,) + new_items[i]
self.cur.execute('DELETE FROM feeds_last_items WHERE feed_id = ?', [feed_id])
self.cur.executemany('INSERT INTO feeds_last_items (feed_id, url, title, description, date) VALUES (?, ?, ?, ?, ?)', new_items)
self.conn.commit()