Use the PooledDB connection pool of dbutils to operate the database
# coding=utf-8 """ Use the connections in the DBUtils database connection pool to operate the database OperationalError: (2006, ‘MySQL server has gone away’) """ import json import pymysql import datetime from DBUtils.PooledDB import PooledDB import pymysql class MysqlClient(object): __pool = None; def __init__(self, mincached=10, maxcached =20,maxshared=10, maxconnections=200, blocking=True, maxusage=50, setsession=None, reset=True, host='127.0.0.1', port=3306,db='test', user='root', passwd='123456',charset='utf8mb4'): if not self.__pool: self.__class__.__pool = PooledDB(pymysql, mincached, maxcached, maxshared, maxconnections, blocking, maxusage, setsession, reset, host=host, port=port,db=db, user=user, passwd=passwd, charset=charset, cursorclass=pymysql.cursors.DictCursor ) self._conn = None self._cursor = None self.__get_conn() def __get_conn(self): self._conn = self.__pool.connection(); self._cursor = self._conn.cursor(); def __close(self): try: self.cursor.close() self.conn.close() except Exception as e: print e def __execute(self,sql,param=()): count = self._cursor.execute(sql,param) print count return count @staticmethod def __dict_datetime_obj_to_str (result_dict): """ Convert the datatime object in the dictionary into a string, so that the json conversion does not go wrong """ if result_dict: result_replace = { k:v.__str__() for k,v in result_dict.items()if isinstance(v,datetime.datetime)} result_dict.update(result_replace) return result_dict def select_one(self, sql, param= ()): """ Query a single result """ count = self. __execute (sql,param) result = self._cursor.fetchone() """:type result:dict""" result = self.__dict_datetime_obj_to_str(result) return count,result def select_many(self,sql, param=()): """ query multiple results :param sql: qsl statement :param param: sql parameter :return: number of results and query result set """ count = self.__execute(sql, param) result = self._cursor.fetchall() """:type result:list""" [self.__dict_datetime_obj_to_str(row_dict) for row_dict in result] return count,result def execute(self,sql,param): count = self.__execute(sql,param) return count def begin(self): """ Start transaction """ self._conn.autocommit(0) def end(self,option='commit'): """结束事务""" if option == 'commit': self._conn.autocommit() else: self._conn.rollback() if __name__ == "__main__": mc = MysqlClient() sql1 = 'select * from shijiji WHERE id = 1' result1 = mc.select_one(sql1) print json.dumps(result1[1],ensure_ascii=False) sql2 = 'select * from shijiji WHERE id IN (%s,%s,%s)' param = (2,3,4) print json.dumps(mc.select_many(sql2,param)[1],ensure_ascii=False)