From 22dcc4ef0688231ae274e44a6ba55772a875dee1 Mon Sep 17 00:00:00 2001 From: Miroslavsckaya Date: Sun, 29 May 2022 23:19:17 +0300 Subject: [PATCH] Database module (#17) Co-authored-by: mitsuha_s Reviewed-on: https://git.skobk.in/Miroslavsckaya/tg_rss_bot/pulls/17 Reviewed-by: Alexey Skobkin --- .gitignore | 3 +++ database.py | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) create mode 100644 database.py diff --git a/.gitignore b/.gitignore index 5493d8f..4bb55d6 100644 --- a/.gitignore +++ b/.gitignore @@ -3,3 +3,6 @@ # Python /.venv + +# Database +/*.db \ No newline at end of file diff --git a/database.py b/database.py new file mode 100644 index 0000000..f8f4542 --- /dev/null +++ b/database.py @@ -0,0 +1,76 @@ +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()