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database_manager.py
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database_manager.py
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import sqlite3
import os
from utils import BASE_DIR
class DatabaseManager():
"""Class responsible for the interactions with the database."""
def __init__(self) -> None:
"""
Init a new DB object and create the 'ads' table, if it doesn't exist.
"""
self.DB = os.path.join(BASE_DIR, "database.db")
self.conn = sqlite3.connect(self.DB)
self.cursor = self.conn.cursor()
sql_create_table = """
CREATE TABLE IF NOT EXISTS ads (
id INTEGER PRIMARY KEY AUTOINCREMENT,
url TEXT NOT NULL
);
"""
self.cursor.execute(sql_create_table)
self.cursor.close()
self.conn.commit()
def url_exists(self, url: str) -> bool:
"""
Returns True if an entry with the specified url exists
in the database, otherwise False.
Args:
url (str): the url to check.
Returns:
bool: True if an entry with the specified url exists in
the database, otherwise False.
"""
self.conn = sqlite3.connect(self.DB)
self.cursor = self.conn.cursor()
sql_command = f"SELECT url FROM ads WHERE url = '{url}'"
self.cursor.execute(sql_command)
result = self.cursor.fetchone()
self.cursor.close()
self.conn.commit()
self.conn.close()
if result:
return True
return False
def add_url(self, url: str) -> None:
"""
Adds a new entry with the specified url to the 'ads' table.
Args:
url (str): a string representing the URL of the item.
Returns:
None
"""
self.conn = sqlite3.connect(self.DB)
self.cursor = self.conn.cursor()
sql = "INSERT INTO ads (url) VALUES(?)"
self.cursor.execute(sql, (url,))
self.cursor.close()
self.conn.commit()
self.conn.close()