如何查找数据表列的值并与字符串进行比较？

import mysql.connector

# 连接数据库
cnx = mysql.connector.connect(user='username', password='password',
                              host='localhost', database='database_name')

# 创建游标
cursor = cnx.cursor()

# 编写查询语句
query = "SELECT column_name FROM table_name WHERE column_name = 'target_string'"

# 执行查询
cursor.execute(query)

# 处理结果
result = cursor.fetchall()

# 比较值
for row in result:
    if row[0] == 'target_string':
        print("匹配成功！")
    else:
        print("未找到匹配值。")

# 关闭游标和数据库连接
cursor.close()
cnx.close()