话不多说，直接贴源代码

import pymysql
import time


class DbCheck():
    """数据库连接类"""
    def __init__(self, sql, count):
        self.conn = ''
        self.result = []
        self.sql = sql
        self.count = count
        self.connect()

    def connect(self):
        self.conn = pymysql.connect(host=ip or hostname,
                                    port=3306,
                                    user=username,
                                    password=passw,
                                    db=dbname,
                                    charset='utf8mb4',
                                    cursorclass=pymysql.cursors.DictCursor)

    def execute_sql(self):
        """
        执行 SQL 查询
        :param sql:
        :param count:
        :return:
        """
        if not self.conn:
            self.connect()

        for _ in range(3):
            try:
                with self.conn.cursor() as cursor:
                    cursor.execute(self.sql)
                    self.result = cursor.fetchall()
                    # if self.count == 1:
                    #     result = cursor.fetchone()
                    # else:
                    #     result = cursor.fetchall()
                    #     if self.count > 1:
                    #         result = result[:self.count]
                    self.conn.commit()
                    # print('\n{sql}\n--->>>\t{result}\n{sep}\n'.format(sep='=' * 80, sql=sql, result=result))
                    return self.result
            except pymysql.err.MySQLError:
                self.conn.close()
                self.connect()


if __name__ == "__main__":
    sql = "SELECT * FROM  item where (unix_timestamp(NOW()) - FuiCreateTime < 6000);"
    db = DbCheck(sql, 2)
    db.execute_sql()

这里自己把对应connect的参数填上应该就能连接数据库进行操作了。
也可以在init里面传入参数进行连接。
实测可以执行。