pymysql

* fetchone() ：    返回单个的元组，也就是一条记录(row)，如果没有结果 , 则返回 None    cu.execute("select user,password from user where user='%s'" %name)
    arr= cur.fetchone()   ----此时 通过 arr[0],arr[1]可以依次访问user,password
* fetchall() ：   返回多个元组，即返回多条记录(rows),如果没有结果,则返回 ()   cur.execute("select * from user")***注意：在MySQL中是null，而在Python中则是None

def __init__(self):
    self.conn = pymysql.connect(host='localhost', user='root', password='123', database='crowfunction1', charset='utf8')
    self.db = self.conn.cursor()

def get_goods(self):
    # sql = 'select * from crow_app_period'
    # # print(sql)
    # set = self.db.execute(sql)
    # print(set)
    now_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    start_time = now_time
    end_time = now_time
    lis = []
    tup = (start_time,end_time)
    lis.append(tup)
    # sql = 'insert into crow_app_period values(%s,%s)'
    # self.db.execute("insert into crow_app_period(start_time,end_time)  values('%s','%s')" %  (start_time, end_time))
    self.db.execute("select end_time from crow_app_period where id=27130")
    print(self.db.fetchall()   显示整条信息或者全部信息
    # self.db.execute("INSERT INTO crow_app_period(start_time,end_time) values (start_time, end_time)")
    # self.db.executemany(sql, lis)  # 执行插入数据
    # self.db.close()
    self.conn.commit()
    # self.conn.close()