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module_13_db2/materials/update.py
35 строк
1 KB
Alexander Kharlamov
typing and flask versions
28 янв 2023, 17:44
28 янв 2023, 17:44
ce932aa
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import sqlite3 from typing import Tuple get_person_balance_by_name_sql: str = """ SELECT balance FROM `table_holiday` WHERE name = ?; """ update_person_balance_by_name_sql: str = """ UPDATE `table_holiday` SET balance = ? WHERE name = ?; """ def get_person_balance_using_name(c: sqlite3.Cursor, name: str) -> int: c.execute(get_person_balance_by_name_sql, (name,)) result: Tuple[int, ] = c.fetchone() return result[0] def update_person_balance_using_name(c: sqlite3.Cursor, name: str, delta: int) -> None: old_balance: int = get_person_balance_using_name(c, name) new_balance: int = old_balance + delta c.execute(update_person_balance_by_name_sql, (new_balance, name)) if __name__ == "__main__": with sqlite3.connect("db_holiday.db") as conn: cursor: sqlite3.Cursor = conn.cursor() balance_before: int = get_person_balance_using_name(cursor, "Вася") update_person_balance_using_name(cursor, "Вася", 500) balance_after: int = get_person_balance_using_name(cursor, "Вася") print(f"balance_before = {balance_before}, balance_after = {balance_after}")