python_操作数据库类

import pymysql
class Db:
    def __init__(self,host,user,password,db,port=3306,charset=‘utf8‘):
        #构造函数，实例化的时候自动执行构造函数
        self.db_info = {‘user‘: user, ‘password‘: password, ‘host‘: host, ‘db‘: db, ‘port‘: port,‘charset‘:charset,‘autocommit‘: True}
        self.__connect()  #__代表私有方法

    def __del__(self):   #析构函数
        self.__close()
        print("关闭数据库")

    def __connect(self):   #__代表私有方法
        # db_info = {‘user‘: ‘xmb‘, ‘password‘: ‘123456‘, ‘host‘: ‘127.0.0.0‘, ‘db‘: ‘xmb‘, ‘port‘: 3306,
        #            ‘charset‘: ‘utf8‘, ‘autocommit‘: True}
        try:
            self.conn = pymysql.connect(**self.db_info)  # 建立连接
        except Exception as e:
            print("数据库连接不上")
            raise Exception("数据库连接不上,请检查数据库连接信息")
        else:
            self.cur = self.conn.cursor(pymysql.cursors.DictCursor)  # 游标

    def execute_many(self,sql):
        self.cur.execute(sql)
        return self.cur.fetchall()

    def  excute_one(self,sql):
        self.cur.execute(sql)
        return self.cur.fetchone()

    def __close(self):  #__代表私有方法
        self.conn.close()
        self.cur.close()

    def export_excel(self,table_name):
        pass

mysql = Db(‘127.0.0.0‘,‘xmb‘,‘123456‘,‘xmb‘)
result = mysql.excute_one(‘select * from app_myuser ‘)
print(result)