Python MySQLdb 模块，DatabaseError() 实例源码

def open_spider(self, spider):
        """
        called when spider is opened.
        do something before pipeline is processing items.
        example: do settings or create connection to the database.
        """
        try:
            spider.logger.debug("trying to connect mysql")
            self.db = MySQLdb.connect(host=self.mysql_ip, port=self.mysql_port,
                                      user=self.mysql_user,
                                      passwd=self.mysql_password,
                                      db=self.mysql_database)
        except MySQLdb.DatabaseError:
            spider.logger.error("can not connect mysql")
            raise MySQLdb.DatabaseError
        return

def execute(self,sql):
        '''exec sql insert'''
        ret = 0
        try:
            cursor = self.conn.cursor()
            ret = cursor.execute(sql)
        except (AttributeError,MySQLdb.OperationalError, MySQLdb.DatabaseError):            
            logger.error(traceback.format_exc())
            logger.error("sql:{0}".format(sql))
            self.connect()
            if self.conn:
                cursor = self.conn.cursor()
                ret = cursor.execute(sql)
        return ret