Python MySQLdb.cursors() Examples

def getdbconnection(configsection, as_dict=False, defaultargs={}):
    """ Helper function that gets a database connection object from a config dictionary """

    dbengine = configsection['dbengine'] if 'dbengine' in configsection else 'MySQLDB'

    if dbengine == 'MySQLDB':

        dbargs = defaultargs.copy()
        # Convert the external configuration names to python PEP-249 config names
        translate = {"host": "host", 
                     "defaultsfile": "read_default_file",
                     "user": "user",
                     "pass": "passwd",
                     "port": "port"}

        for confval, myval in translate.iteritems():
            if confval in configsection:
                dbargs[myval] = configsection[confval]

        if as_dict:
            dbargs['cursorclass'] = MySQLdb.cursors.DictCursor

        return MySQLdb.connect(**dbargs)
    else:
        raise Exception("Unsupported database engine %s" % (dbengine)) 

def __init__(self):

        env = C.get('sys', 'env')
        host = C.get('mysql_' + env, 'host')
        user = C.get('mysql_' + env, 'user')
        passwd = C.get('mysql_' + env, 'password')
        name = C.get('mysql_' + env, 'name')

        self.db = MySQLdb.connect(
            host = host,
            port = 3306,
            user = user,
            passwd = passwd,
            db = name,
            charset='utf8',
            cursorclass = MySQLdb.cursors.DictCursor)
        self.cursor = self.db.cursor() 

def from_settings(cls,settings):
        '''[email protected]?????????????????????????? 
           2??????????cls?class????????????????????????self??????????
           3????????????C.f()????java??????'''
        dbparams=dict(
            host=settings['MYSQL_HOST'],#??settings????
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',#??????????????????
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=False,
        )
        dbpool=adbapi.ConnectionPool('MySQLdb',**dbparams)#**?????????????,???host=xxx,db=yyy....
        return cls(dbpool)#???dbpool???????self?????

    #pipeline???? 

def __init__(self,db_name,host='',user='',passwd='',autocommit=True,loglevel='WARNING',use_tuples=False,default_cursor=None):
        """ Initialization of MySQL connection """
        self.call__init__(log.Logger,self.__class__.__name__,format='%(levelname)-8s %(asctime)s %(name)s: %(message)s')
        self.setLogLevel(loglevel or 'WARNING')
        #def __init__(self,api,db_name,user='',passwd='', host=''):
        #if not api or not database:
            #self.error('ArchivingAPI and database are required arguments for ArchivingDB initialization!')
            #return
        #self.api=api
        self.db_name=db_name
        self.host=host
        self.use_tuples = use_tuples #It will control if data is returned in tuples or lists
        self.setUser(user,passwd)
        self.autocommit = autocommit
        self.renewMySQLconnection()
        self.default_cursor = default_cursor or MySQLdb.cursors.Cursor
        self._cursor=None
        self._recursion = 0
        self.tables={} 

def getCursor(self,renew=True,klass=None):
        ''' 
        returns the Cursor for the database
        renew will force the creation of a new cursor object
        klass may be any of MySQLdb.cursors classes (e.g. DictCursor)
        MySQLdb.cursors.SSCursor allows to minimize mem usage in clients (although it relies memory cleanup to the server!)
        '''
        try:
            if klass in ({},dict):
                klass = MySQLdb.cursors.DictCursor
            if (renew or klass) and self._cursor: 
                if not self._recursion:
                    self._cursor.close()
                    del self._cursor
            if renew or klass or not self._cursor:
                self._cursor = self.db.cursor(self.default_cursor) if klass is None else self.db.cursor(cursorclass=klass)
            return self._cursor
        except:
            print traceback.format_exc()
            self.renewMySQLconnection()
            self._recursion += 1
            return self.getCursor(renew=True,klass=klass) 

def from_settings(cls, settings):
        '''[email protected]??????????????????????????
           2??????????cls?class????????????????????????self??????????
           3????????????C.f()????java??????'''
        dbparams = dict(
            host=settings['MYSQL_HOST'],  # ??settings????
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',  # ??????????????????
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=False,
        )
        dbpool = adbapi.ConnectionPool('MySQLdb', **dbparams)  # **?????????????,???host=xxx,db=yyy....
        return cls(dbpool)  # ???dbpool???????self?????

    # pipeline???? 

def from_settings(cls, settings):
        '''[email protected]?????????????????????????? 
           2??????????cls?class????????????????????????self??????????
           3????????????C.f()????java??????'''
        dbparams = dict(
            host=settings['MYSQL_HOST'],  # ??settings????
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',  # ??????????????????
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool('MySQLdb', **dbparams)  # **?????????????,???host=xxx,db=yyy....
        return cls(dbpool)  # ???dbpool???????self?????

    # pipeline???? 

def ConnecttoDB(self, params):

        try:
            conn = \
                MySQLdb.connect(host = params[0], \
                                user = params[1], \
                                passwd = params[2], \
                                db = params[3], \
                                port = params[4], \
                                charset = params[5], \
                                cursorclass = MySQLdb.cursors.DictCursor)

            return conn
        except MySQLdb.Warning, w:
            print  "Warning:%s" % str(w)
            return None
        except MySQLdb.Error, e:
            print  "Error:%s" % str(e)
            return None 

def from_crawler(cls, crawler):
		"""[email protected]thod ??????????????????????????
		   2??????????cls?class????????????????????????self??????????
		   3????????????C.f()????java??????
		"""
		db_params = dict(
			host=crawler.settings['MYSQL_HOST'],  # ??settings????
			db=crawler.settings['MYSQL_DBNAME'],
			user=crawler.settings['MYSQL_USER'],
			passwd=crawler.settings['MYSQL_PASSWD'],
			charset='utf8',  # ??????????????????
			cursorclass=MySQLdb.cursors.DictCursor,
			use_unicode=False,
		)
		
		db_pool = adbapi.ConnectionPool('MySQLdb', **db_params)  # **?????????????,???host=xxx,db=yyy....
		return cls(db_pool)  # ??? db_pool ??????self????? 

def setup_mysqldb(self):
        import MySQLdb
        import MySQLdb.cursors

        self.schema_supported['mysql'] = (
            MySQLdb.connect,
            {
                'host': 'hostname',
                'port': 'port',
                'user': 'username',
                'passwd': 'password',
                'db': 'args',
                'use_unicode': 'kwargs',
                'cursorclass': 'kwargs',
                '__kwargs__': 'kwargs'
                },
            {
                'port': lambda port: port or 3306,
                'db': lambda args: args[0],
                'use_unicode': lambda kwargs: eval(kwargs.get('use_unicode', 'True')),
                'cursorclass': lambda kwargs: getattr(MySQLdb.cursors, kwargs.get('cursorclass', 'Cursor')),
                },
            None,
            ) 

def __init__(self, settings):
        dbname = settings['MYSQL_DBNAME']
        tbname = settings['TIEBA_NAME']
        if not dbname.strip():
            raise ValueError("No database name!")
        if not tbname.strip():
            raise ValueError("No tieba name!")          
        if isinstance(tbname, unicode):
            settings['TIEBA_NAME'] = tbname.encode('utf8')

        self.settings = settings
        
        self.dbpool = adbapi.ConnectionPool('MySQLdb',
            host=settings['MYSQL_HOST'],
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8mb4',
            cursorclass = MySQLdb.cursors.DictCursor,
            init_command = 'set foreign_key_checks=0' #??????
        ) 

def from_settings(cls, settings):
        dbparms = dict(
            host = settings["MYSQL_HOST"],
            db = settings["MYSQL_DBNAME"],
            user = settings["MYSQL_USER"],
            passwd = settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def from_settings(cls, settings):
        dbparms = dict(
            host=settings["MYSQL_HOST"],
            db=settings["MYSQL_DBNAME"],
            user=settings["MYSQL_USER"],
            passwd=settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def from_settings(cls, settings):
        dbparms = dict(
            host=settings["MYSQL_HOST"],
            db=settings["MYSQL_DBNAME"],
            user=settings["MYSQL_USER"],
            passwd=settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def from_settings(cls, settings):
        dbparms = dict(
            host=settings["MYSQL_HOST"],
            db=settings["MYSQL_DBNAME"],
            user=settings["MYSQL_USER"],
            passwd=settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def connect(self):
        try:
            self.conn = MySQLdb.connect(host=self.__host, user=self.__username, passwd=self.__password,
                                   port=self.__port, cursorclass = MySQLdb.cursors.DictCursor)
            self.cursor = self.conn.cursor()
            # res = cur.execute('select * from user');
            # info = cur.fetchmany(res)
            # for data in info:
            #     print data
            # cur.close()
            # conn.close()
        except MySQLdb.Error, e:
            Log.log_error('MySql Error %%s'% str(e)) 

def from_settings(cls, settings):
        dbparms = dict(
            host = settings["MYSQL_HOST"],
            db = settings["MYSQL_DBNAME"],
            user = settings["MYSQL_USER"],
            password = settings["MYSQL_PASSWORD"],
            charset = "utf8",
            cursorclass = MySQLdb.cursors.DictCursor,
            use_unicode = True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)
        return cls(dbpool) 

def connect(self):
        if hasattr(self, 'conn') and self.conn.open:
            return True

        logger.debug('No open MySQL connection, setting up new')
        self.conn = MySQLdb.connect(
            host='localhost',
            user=self.mycnf.get('user', 'root'),
            passwd=self.mycnf.get('password', None),
            cursorclass=MySQLdb.cursors.DictCursor
        ) 

def __init__(self):
        dbargs = dict(
             host = '127.0.0.1',
             db = 'test',
             user = 'root',
             passwd = '123456',
             cursorclass = MySQLdb.cursors.DictCursor,
             charset = 'utf8',
             use_unicode = True
            )
        self.dbpool = adbapi.ConnectionPool('MySQLdb',**dbargs) 

def config_conn(self, connection):
        self.db_config = self.config['connections'].get(connection)
        return self.manual_conn(host=self.db_config.get('host', None),
                                user=self.db_config.get('user', None),
                                passwd=self.db_config.get('pass', None),
                                db=self.db_config.get('db', None),
                                cursorclass=MySQLdb.cursors.DictCursor) 

def manual_conn(self, host, user, passwd, db,
                    cursorclass=MySQLdb.cursors.DictCursor):
        return MySQLdb.connect(host=host,
                               user=user,
                               passwd=passwd,
                               db=db,
                               cursorclass=cursorclass) 

def from_settings(cls, settings):
        dbparams = dict(
            host=settings["MYSQL_HOST"],
            port=settings["MYSQL_PORT"],
            user=settings["MYSQL_USER"],
            passwd=settings["MYSQL_PWD"],
            db=settings["MYSQL_DB"],
            charset=settings["MYSQL_CHARSET"],
            use_unicode=settings["MYSQL_USER_UNICODE"],
            cursorclass=MySQLdb.cursors.DictCursor,
        )
        # ????adbapi????dbpool????MyTwistedPipeline?????
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparams)
        return cls(dbpool) 

def __init__(self,dbpool):
        self.dbpool=dbpool
        ''' ?????????????????????????settings????????????
            self.dbpool=adbapi.ConnectionPool('MySQLdb',
                                          host='127.0.0.1',
                                          db='crawlpicturesdb',
                                          user='root',
                                          passwd='123456',
                                          cursorclass=MySQLdb.cursors.DictCursor,
                                          charset='utf8',
                                          use_unicode=False)''' 

def get_conn(self):
        """
        Returns a mysql connection object
        """
        conn = self.get_connection(self.mysql_conn_id)
        conn_config = {
            "user": conn.login,
            "passwd": conn.password or '',
            "host": conn.host or 'localhost',
            "db": self.schema or conn.schema or ''
        }

        if not conn.port:
            conn_config["port"] = 3306
        else:
            conn_config["port"] = int(conn.port)

        if conn.extra_dejson.get('charset', False):
            conn_config["charset"] = conn.extra_dejson["charset"]
            if (conn_config["charset"]).lower() == 'utf8' or\
                    (conn_config["charset"]).lower() == 'utf-8':
                conn_config["use_unicode"] = True
        if conn.extra_dejson.get('cursor', False):
            if (conn.extra_dejson["cursor"]).lower() == 'sscursor':
                conn_config["cursorclass"] = MySQLdb.cursors.SSCursor
            elif (conn.extra_dejson["cursor"]).lower() == 'dictcursor':
                conn_config["cursorclass"] = MySQLdb.cursors.DictCursor
            elif (conn.extra_dejson["cursor"]).lower() == 'ssdictcursor':
                conn_config["cursorclass"] = MySQLdb.cursors.SSDictCursor
        local_infile = conn.extra_dejson.get('local_infile',False)
        if conn.extra_dejson.get('ssl', False):
            conn_config['ssl'] = conn.extra_dejson['ssl']
        if local_infile:
            conn_config["local_infile"] = 1
        conn = MySQLdb.connect(**conn_config)
        return conn 

def __init__(self):
        self.dbpool = adbapi.ConnectionPool('MySQLdb',
            db = 'guazi',
            user = 'root',
            passwd = '',
            cursorclass = MySQLdb.cursors.DictCursor,
            charset = 'utf8',
            use_unicode = True
            ) 

def __init__(self):
        # host = config.DB_config.get('mysql').get('host')
        # port = config.DB_config.get('mysql').get('port')
        # user = config.DB_config.get('mysql').get('user')
        # password = config.DB_config.get('mysql').get('password')
        # db = config.DB_config.get('database')
        # self.mysql_conn = MySQLdb.connect(host, user, password, db, charset="utf8", use_unicode=True)
        dbparms = config.DB_config.get("mysql")
        dbparms['db'] = config.database
        dbparms['cursorclass'] = MySQLdb.cursors.DictCursor
        dbparms['use_unicode'] = True
        self.mysql_conn = MySQLdb.connect(**dbparms) 

def from_settings(cls, settings):
        dbparms = config.DB_config.get("mysql")
        dbparms['db'] = config.database
        dbparms['cursorclass'] = MySQLdb.cursors.DictCursor
        dbparms['use_unicode'] = True

        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def commit(query, params):
    c = database.cursor(MySQLdb.cursors.Cursor)
    try:
        c.execute(query, params)
        database.commit()
    except Exception as ex:
        database.rollback()
        print ex
        print c._last_executed 

def from_settings(cls,settings):
        dbparams=dict(
            host=settings['MYSQL_HOST'],#??settings????
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',#??????????????????
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=False,
        )
        dbpool=adbapi.ConnectionPool('MySQLdb',**dbparams)#**?????????????,???host=xxx,db=yyy....
        return cls(dbpool)#???dbpool???????self????? 

def from_settings(cls, settings):
        dbparms = dict(
            host = settings["MYSQL_HOST"],
            db = settings["MYSQL_DBNAME"],
            user = settings["MYSQL_USER"],
            password = settings["MYSQL_PASSWORD"],
            charset = 'utf8',
            cursorclass = MySQLdb.cursors.DictCursor,
            use_unicode = True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb",**dbparms)
        return cls(dbpool) 

def connect_mysql(self, dbhost, dbuser, dbpassword, dbname):
        self.type = self.TYPE_MYSQL
        self.db = MySQLdb.connect(host=dbhost, user=dbuser, passwd=dbpassword,
                db=dbname, cursorclass=MySQLdb.cursors.DictCursor) 

def from_settings(cls, settings):
        dbparms = dict(
            host = settings["MYSQL_HOST"],
            db = settings["MYSQL_DBNAME"],
            user = settings["MYSQL_USER"],
            passwd = settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def from_settings(cls, settings):
        dbparms = dict(
            host=settings["MYSQL_HOST"],
            db=settings["MYSQL_DBNAME"],
            user=settings["MYSQL_USER"],
            passwd=settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def __init__(self):
        self.dbpool = adbapi.ConnectionPool(
                                    dbapiName = 'MySQLdb',
                                    host = 'localhost',
                                    db = 'sina_spider_db',
                                    user = 'root',
                                    passwd = 'gongli',
                                    cursorclass = MySQLdb.cursors.DictCursor,
                                    charset = 'utf8mb4',
                                    ) 

def __init__(self):
        self.dbpool = adbapi.ConnectionPool(
                                    dbapiName='MySQLdb',
                                    host=settings.DB_HOST,
                                    db=settings.DB,
                                    user=settings.DB_NAME,
                                    passwd=settings.DB_PASSWD,
                                    cursorclass= MySQLdb.cursors.DictCursor,
                                    charset = 'utf8',
                                    use_unicode = False
                                    ) 

def __init__(self):
        self.dbpool = adbapi.ConnectionPool(
                                    dbapiName='MySQLdb',
                                    host=settings.DB_HOST,
                                    db=settings.DB,
                                    user=settings.DB_NAME,
                                    passwd=settings.DB_PASSWD,
                                    cursorclass= MySQLdb.cursors.DictCursor,
                                    charset = 'utf8',
                                    use_unicode = False
                                    ) 

def from_settings(cls, settings):
        dbparms = dict(
            host=settings["MYSQL_HOST"],
            db=settings["MYSQL_DBNAME"],
            user=settings["MYSQL_USER"],
            passwd=settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)
        return cls(dbpool)      # dbpool???__init__

    # ??twisted?mysql???????? 

def getCursor(self):
        #cursorclass=MySQLdb.cursors.DictCursor,
        self.conn.autocommit(1) 
        self.cur=self.conn.cursor() 

def get_conn(self):
        """
        Returns a mysql connection object
        """
        conn = self.get_connection(self.mysql_conn_id)
        conn_config = {
            "user": conn.login,
            "passwd": conn.password or ''
        }

        conn_config["host"] = conn.host or 'localhost'
        if not conn.port:
            conn_config["port"] = 3306
        else:
            conn_config["port"] = int(conn.port)

        conn_config["db"] = conn.schema or ''

        if conn.extra_dejson.get('charset', False):
            conn_config["charset"] = conn.extra_dejson["charset"]
            if (conn_config["charset"]).lower() == 'utf8' or\
                    (conn_config["charset"]).lower() == 'utf-8':
                conn_config["use_unicode"] = True
        if conn.extra_dejson.get('cursor', False):
            if (conn.extra_dejson["cursor"]).lower() == 'sscursor':
                conn_config["cursorclass"] = MySQLdb.cursors.SSCursor
            elif (conn.extra_dejson["cursor"]).lower() == 'dictcursor':
                conn_config["cursorclass"] = MySQLdb.cursors.DictCursor
            elif (conn.extra_dejson["cursor"]).lower() == 'ssdictcursor':
                conn_config["cursorclass"] = MySQLdb.cursors.SSDictCursor
        local_infile = conn.extra_dejson.get('local_infile',False)
        if conn.extra_dejson.get('ssl', False):
            conn_config['ssl'] = conn.extra_dejson['ssl']
        if local_infile:
            conn_config["local_infile"] = 1
        conn = MySQLdb.connect(**conn_config)
        return conn 

def get_database(self,epoch=-1):
        try:
            if epoch<0: epoch = time.time()
            config = sorted((e,c) for e,c in self.configs.items() if e<=epoch)[-1][-1]
        except Exception,e:
            #traceback.print_exc()
            self.log.warning('Unable to get DB(%s,%s) config at %s, using Java Extractors.\n%s'%(self.db_name,self.schema,epoch,e))
            return None
        try:
            user,host = '@' in config and config.split('@',1) or (config,os.environ['HOST'])
            user,passwd = ':' in user and user.split(':',1) or (user,'')
            host,db_name = host.split('/') if '/' in host else (host,self.db_name)
            #(self.log.info if len(self.configs)>1 else self.log.debug)('Accessing MySQL using config = %s:[email protected]%s/%s' % (user,host,db_name))
        except:
            self.log.warning('Wrong format of DB config: %s.\n%s'%(config,traceback.format_exc()))
            return None
        try:
            if (host,db_name) not in self.dbs:
                if self.is_hdbpp:
                    from PyTangoArchiving.hdbpp import HDBpp
                    self.dbs[(host,db_name)] = HDBpp(db_name,host,user,passwd)
                else: 
                    self.dbs[(host,db_name)] = ArchivingDB(db_name,host,user,passwd,loglevel=self.log.getLogLevel(),default_cursor=MySQLdb.cursors.SSCursor)
                
            if '%[email protected]%s'%(db_name,host) != self._last_db:
                self._last_db = '%[email protected]%s'%(db_name,host)
                self.log.info('In get_database(%s): %s'%(epoch,self._last_db))
            return self.dbs[(host,db_name)]
        except:
            self.log.warning('Unable to access MySQL using config = %s:[email protected]%s/%s\n%s' % (user,host,db_name,traceback.format_exc()))
            return None 

def from_settings(cls, settings):
        dbargs = dict(
            host=settings['MYSQL_HOST'],
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',
            cursorclass = MySQLdb.cursors.DictCursor,
            use_unicode= True,
        )
        dbpool = adbapi.ConnectionPool('MySQLdb', **dbargs)
        return cls(dbpool) 

def _get_connection(self):
        """??????mysql, ?????????, ??????mysql?????"""
        sleep_interval = 1
        while True:
            try:
                conn = MySQLdb.connect(**self.conn_kwargs)  # type: MySQLdb.connections.Connection
                
                cur = conn.cursor()  # type: MySQLdb.cursors.Cursor
                cur.execute('SET NAMES UTF8')
            except:
                log.error("????mysql", exc_info=True)
                time.sleep(sleep_interval)
                sleep_interval += 10
            else:
                return conn, cur 

def conn_mysql():
	verbose("Connecting to MySQL......")
	if args.prompt_password:
		password=getpass.getpass("Please input your MySQL password:")
	else:
		password = args.password
	conn = MySQLdb.connect(user=args.user,host=args.host,port=args.port,unix_socket=args.socket,passwd=args.password,db=args.old_database,cursorclass=MySQLdb.cursors.DictCursor)
	return conn
	# ??MySQL??
	# connect to MySQL 

def from_settings(cls, settings):
        dbargs = dict(
            host=settings['MYSQL_HOST'],
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',
            cursorclass = MySQLdb.cursors.DictCursor,
            use_unicode= True,
        )
        dbpool = adbapi.ConnectionPool('MySQLdb', **dbargs)
        return cls(dbpool)

    #pipeline???? 

def from_crawler(cls, crawler):
		db_params = dict(
			host=crawler.settings['MYSQL_HOST'],  # ??settings????
			db=crawler.settings['MYSQL_DBNAME'],
			user=crawler.settings['MYSQL_USER'],
			passwd=crawler.settings['MYSQL_PASSWD'],
			charset='utf8',  # ??????????????????
			cursorclass=MySQLdb.cursors.DictCursor,
			use_unicode=False,
		)
		
		db_pool = adbapi.ConnectionPool('MySQLdb', **db_params)  # **?????????????,???host=xxx,db=yyy....
		return cls(db_pool)  # ??? db_pool ??????self????? 

def connectMysql(self):
		conn = MySQLdb.connect(
			host=self.settings['MYSQL_HOST'],
			db=self.settings['MYSQL_DBNAME'],
			user=self.settings['MYSQL_USER'],
			passwd=self.settings['MYSQL_PASSWD'],
			charset='utf8',
			cursorclass=MySQLdb.cursors.DictCursor,
			use_unicode=False,
		)
		return conn 

def from_settings(cls, settings):
        dbparms = dict(
            host = settings["MYSQL_HOST"],
            db = settings["MYSQL_DBNAME"],
            user = settings["MYSQL_USER"],
            passwd = settings["MYSQL_PASSWORD"],
            charset='utf8',
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=True,
        )
        dbpool = adbapi.ConnectionPool("MySQLdb", **dbparms)

        return cls(dbpool) 

def __init__(self):
        self.conn = MySQLdb.connect(
            db=CONFIG.DATABASE,
            host=CONFIG.DATABASE_HOST,
            user=CONFIG.DATABASE_USER,
            password=CONFIG.DATABASE_PASS,
            cursorclass=MySQLdb.cursors.DictCursor,
            charset='utf8',
        )
        self.conn.autocommit(True) 

def check_for_user_activity(instance):
    zk = MysqlZookeeper()
    username, password = get_mysql_user_for_role('admin')

    # check mysql activity
    log.info('Checking activity on {instance}'.format(instance=instance[
        'hostname']))
    with timeout.timeout(3):
        conn = MySQLdb.connect(
            host=instance['internal_ip'],
            user=username,
            passwd=password,
            cursorclass=MySQLdb.cursors.DictCursor)
    if not conn:
        raise Exception('Could not connect to {ip}'
                        ''.format(ip=instance['internal_ip']))

    activity = get_user_activity(HostAddr(instance['hostname']))
    unexpected = set(activity.keys()).difference(IGNORABLE_USERS)
    if unexpected:
        log.error('Unexpected activity on {instance} by user(s):'
                  '{unexpected}'.format(
                      instance=instance['hostname'],
                      unexpected=','.join(unexpected)))
        return True

    log.info('Checking current connections on '
             '{instance}'.format(instance=instance['hostname']))
    connected_users = get_connected_users(HostAddr(instance['hostname']))
    unexpected = connected_users.difference(IGNORABLE_USERS)
    if unexpected:
        log.error('Unexpected connection on {instance} by user(s):'
                  '{unexpected}'.format(
                      instance=instance['hostname'],
                      unexpected=','.join(unexpected)))
        return True
    return False 

def connect_mysql(instance, role='admin'):
    """Connect to a MySQL instance as admin

    Args:
    hostaddr - object describing which mysql instance to connect to
    role - a string of the name of the mysql role to use. A bootstrap role can
           be called for MySQL instances lacking any grants. This user does not
           exit in zk.

    Returns:
    a connection to the server as administrator
    """
    if role == 'bootstrap':
        socket = get_cnf_setting('socket', instance.port)
        username = 'root'
        password = ''
        db = MySQLdb.connect(
            unix_socket=socket,
            user=username,
            passwd=password,
            cursorclass=MySQLdb.cursors.DictCursor)

    else:
        username, password = get_mysql_user_for_role(role)
        db = MySQLdb.connect(
            host=instance.hostname,
            port=instance.port,
            user=username,
            passwd=password,
            cursorclass=MySQLdb.cursors.DictCursor,
            connect_timeout=CONNECT_TIMEOUT)
    return db