Question

我使用sqlalchemy和pandas连接到db并从sql表创建数据帧。

这是我的代码：

port=3306
unix_socket='/var/lib/mysql/mysql.sock'

conn = "mysql://user:pwd@localhost/dbname?port=3306?unix_socket=/var/lib/mysql/mysql.sock"

_engine = create_engine(conn)
print conn
print _engine

db_conn=_engine.connect()

输出：

Traceback (most recent call last):
  File "runner_train_test.py", line 37, in <module>
    _engine.connect()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                                                                                        py", line 2018, in connect
    return self._connection_cls(self, **kwargs)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                                                                                        py", line 72, in __init__
    if connection is not None else engine.raw_connection()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                                                                                        py", line 2104, in raw_connection
    self.pool.unique_connection, _connection)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                                                                                        py", line 2074, in _wrap_pool_connect
    return fn()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 318, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 713, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 480, in checkout
    rec = pool._do_get()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 1060, in _do_get
    self._dec_overflow()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/util/langhel                                                                                        pers.py", line 60, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 1057, in _do_get
    return self._create_connection()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 323, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 449, in __init__
    self.connection = self.__connect()
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                                                                                        ne 607, in __connect
    connection = self.__pool._invoke_creator(self)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/strat                                                                                        egies.py", line 97, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/defau                                                                                        lt.py", line 385, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/MySQLdb/__init__.py", l                                                                                        ine 81, in Connect
    return Connection(*args, **kwargs)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/MySQLdb/connections.py"                                                                                        , line 193, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
TypeError: an integer is required

Answer 1

您的连接字符串看起来不对。 sqlalchemy documentation说明了以下字符串：mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>或Google云端的示例：mysql+mysqldb://root@/<dbname>?unix_socket=/cloudsql/<projectid>:<instancename>因此您的字符串应该可能是：

mysql://user@/dbname?unix_socket=/var/lib/mysql/mysql.sock

SQL Alchemy：无法使用engine.connect（）进行连接

1 个答案: