pymysql 重试连接数据库

from pymysql import connect
from retrying import retry

class Down_Pdf():
    def __init__(self):
        self.mysql_host = '127.0.0.1'
        self.mysql_port = 3306
        self.mysql_user = 'root'
        self.mysql_password = 'xxxx'
        self.mysql_db = 'datadb'
        self.conn = connect(host=self.mysql_host, port=self.mysql_port, user=self.mysql_user,password=self.mysql_password, db=self.mysql_db, charset='utf8mb4')
        self.cur = self.conn.cursor()

    def new_link(self):#重新连接数据库
        self.conn = connect(host=self.mysql_host, port=self.mysql_port, user=self.mysql_user,password=self.mysql_password, db=self.mysql_db, charset='utf8mb4')
        self.cur = self.conn.cursor()

    @retry(stop_max_attempt_number=6, wait_fixed=2000)
    def all_search(self, sql):
        try:
            self.conn.ping()
        except:
            self.new_link()
        self.cur.execute(sql)
        datas = self.cur.fetchall()
        self.conn.commit() # 每次查询后进行事务提交，下次查询到数据库更新后的数据
        return datas

    @retry(stop_max_attempt_number=6, wait_fixed=2000)
    def one_search(self, sql):
        try:
            self.conn.ping()
        except:
            self.new_link()
        self.cur.execute(sql)
        data = self.cur.fetchone()
        self.conn.commit() # 每次查询后进行事务提交，下次查询到数据库更新后的数据
        return data

    @retry(stop_max_attempt_number=6, wait_fixed=2000)
    def submit_data(self, sql):
        try:
            self.conn.ping()
        except:
            self.new_link()
        self.cur.execute(sql)
        self.conn.commit()

    @retry(stop_max_attempt_number=6, wait_fixed=2000)
    def close(self):
        try:
            self.conn.ping()
        except:
            self.new_link()
        self.cur.close()
        self.conn.close()

    @retry(stop_max_attempt_number=6, wait_fixed=2000)
    def execute_many(self, sql, data):
        """
        :param sql:
        :param data: [(1,2,3)]
        """
        if not data: return
        try:
            self.conn.ping()
        except:
            self.new_link()
        try:
            self.conn.ping(reconnect=True)
            self.cur.executemany(sql, data)
            self.conn.commit()
        except Exception as e:
            print(e)