新手学习python（十七）mysql操作

import pymysql
class Mydb(object):
    def __del__(self):  # 析构函数,实例对象被销毁的时候调用
        self.cur.close()
        self.coon.close()
        print('over....')

    def __init__(self,host,user,passwd,db,port=3306,charset='utf8'):
        try:
            self.coon=pymysql.connect(
                host=host,user=user,passwd=passwd,port=port,charset=charset,db=db,
            autocommit=True) #自动提交
        except Exception as e:
            print('数据库连接失败.%s'%e)
        else:
            self.cur=self.coon.cursor(cursor=pymysql.cursors.DictCursor)

    def ex_sql(self,sql):
        try:
            self.cur.execute(sql)
        except Exception as e:
            print('sql语句有问题，%s'%sql)
        else:
            self.res=self.cur.fetchall()
            return self.res

my=Mydb('118.24.3.xx','jxxx','123456','jxxxx')
my.ex_sql('select * from stu;')
print(my.res)
print('我是最后一行了。。。。')