Sqlite3 Tutorial Query Python Fixed -

import sqlite3 import os

When table names must be dynamic, sanitize the string against a strict whitelist of allowed identifiers before interpolating it via string formatting. sqlite3 tutorial query python fixed

def fetch_users_by_age(min_age: int, max_age: int) -> List[dict]: """Fixed: Uses placeholders instead of f-strings""" query = """ SELECT id, name, email, age FROM users WHERE age BETWEEN ? AND ? ORDER BY age DESC """ with get_db_connection() as conn: cursor = conn.cursor() cursor.execute(query, (min_age, max_age)) return [dict(row) for row in cursor.fetchall()] import sqlite3 import os When table names must

# Insert only if empty cursor.execute('SELECT COUNT(*) FROM books') if cursor.fetchone()[0] == 0: books = [ ('Clean Architecture', 'Robert C. Martin', 2017, 4.6), ('Eloquent JavaScript', 'Marijn Haverbeke', 2018, 4.4), ] cursor.executemany('INSERT INTO books (title, author, year, rating) VALUES (?,?,?,?)', books) conn.commit() print("Sample data inserted.") ORDER BY age DESC """ with get_db_connection() as

all_users = query_all_users() for user in all_users: print(user)

# Clean up if file exists from a previous run if os.path.exists(db_name): os.remove(db_name)