为什么我的pymysql插入操作不成功却没有任何报错？

import pymysqldef save_db(cons):    db = pymysql.connect(host='127.0.0.1', user='root', password='root', port=3306)    cursor = db.cursor()    sql = 'INSERT INTO quote(jy_time,open_price,high_price,low_price,over_price,zhangdiee,zhangdief,chengjiaol,chengjiaoj,zhenfu,huanshoul) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)'    print('插入中...')    try:        cursor.execute(sql, cons)        print(cons)        db.commit()    except:        print('失败了啊')        db.rollback()    db.close()