使用python和sqlite3更改字符串的问题

import sqlite3

conn = sqlite3.connect('database.db')

cursor = conn.cursor()

cursor.execute("SELECT * FROM table_name")

results = cursor.fetchall()

for row in results:
    old_string = row[0]  # 假设要更改的字符串在第一列
    new_string = old_string.replace('old_value', 'new_value')  # 使用replace方法替换字符串
    cursor.execute("UPDATE table_name SET column_name = ? WHERE condition", (new_string,))

conn.commit()
conn.close()