tg_rss_bot/database.py

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import sqlite3
class Database():
def __init__(self, path: str) -> None:
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self.conn = sqlite3.connect(path)
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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, FOREIGN KEY(user_id) REFERENCES users(id), FOREIGN KEY(feed_id) REFERENCES feeds(id))')
self.cur.execute('CREATE UNIQUE INDEX IF NOT EXISTS subscriptions_index ON subscriptions (user_id, feed_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))')
self.cur.execute('CREATE UNIQUE INDEX IF NOT EXISTS feed_item_index ON feeds_last_items (feed_id, date)')
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def add_user(self, telegram_id: str) -> int:
self.cur.execute('INSERT INTO users (telegram_id) VALUES (?)', [telegram_id])
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self.conn.commit()
return self.cur.lastrowid
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def find_user(self, telegram_id: str) -> int | None:
self.cur.execute('SELECT id FROM users WHERE telegram_id = ?', [telegram_id])
row = self.cur.fetchone()
if row is None:
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return None
return row[0]
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def add_feed(self, url: str) -> int:
self.cur.execute('INSERT INTO feeds (url) VALUES (?)', [url])
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self.conn.commit()
return self.cur.lastrowid
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def subscribe_user(self, user_id: int, feed_id: int) -> None:
self.cur.execute('INSERT INTO subscriptions (user_id, feed_id) VALUES (?, ?)', [user_id, feed_id])
self.conn.commit()
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def unsubscribe_user(self, user_id: int, feed_id: int) -> None:
self.cur.execute('DELETE FROM subscriptions WHERE feed_id = ? AND user_id = ?', [feed_id, user_id])
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self.conn.commit()
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def delete_feed(self, feed_id: int) -> None:
self.cur.execute('DELETE FROM feeds WHERE id = ?', [feed_id])
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self.conn.commit()
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def find_feeds(self) -> list:
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self.cur.execute('SELECT * FROM feeds')
return self.cur.fetchall()
def find_user_feeds(self, user_id: int) -> list:
self.cur.execute('SELECT * FROM feeds WHERE id IN (SELECT feed_id FROM subscriptions WHERE user_id = ?)', [user_id])
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return self.cur.fetchall()
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def find_feed_items(self, feed_id: int) -> list:
self.cur.execute('SELECT * FROM feeds_last_items WHERE feed_id = (?)', [feed_id])
return self.cur.fetchall()