ModuleNotFoundError:没有名为"MySQLdb"的模块Amazon MySQL RDS SQLAlchemy [英] ModuleNotFoundError: No module named 'MySQLdb' Amazon MySQL RDS SQLAlchemy

问题描述

我在将Amazon AWS MySQL与SQLAlchemy连接时遇到问题.根据指示，我已连接.

I am having issues with connecting Amazon AWS MySQL with SQLAlchemy. According to the instruction, I have connected.

app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://<user>:<password>@<host>/<dbname>

但是有一个错误:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ec2-user/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 514, in __get__
    return type.query_class(mapper, session=self.sa.session())
  File "/home/ec2-user/venv/lib/python3.7/site-packages/sqlalchemy/orm/scoping.py", line 74, in __call__
    return self.registry()
  File "/home/ec2-user/venv/lib/python3.7/site-packages/sqlalchemy/util/_collections.py", line 1001, in __call__
    return self.registry.setdefault(key, self.createfunc())
  File "/home/ec2-user/venv/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 2950, in __call__
    return self.class_(**local_kw)
  File "/home/ec2-user/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 143, in __init__
    bind = options.pop('bind', None) or db.engine
  File "/home/ec2-user/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 877, in engine
    return self.get_engine()
  File "/home/ec2-user/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 896, in get_engine
    return connector.get_engine()
  File "/home/ec2-user/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 559, in get_engine
    self._engine = rv = sqlalchemy.create_engine(info, **options)
  File "/home/ec2-user/venv/lib/python3.7/site-packages/sqlalchemy/engine/__init__.py", line 424, in create_engine
    return strategy.create(*args, **kwargs)
  File "/home/ec2-user/venv/lib/python3.7/site-packages/sqlalchemy/engine/strategies.py", line 81, in create
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "/home/ec2-user/venv/lib/python3.7/site-packages/sqlalchemy/dialects/mysql/mysqldb.py", line 102, in dbapi
    return __import__('MySQLdb')
ModuleNotFoundError: No module named 'MySQLdb'

我正在使用Python3.7版本.即使根据stackoverflow，我已经安装了pymysql，但仍然面临问题.

I am using Python3.7 version. Even according to the stackoverflow, I have installed pymysql, but still facing the problem.

谢谢您的答复.

推荐答案

步骤1 如果要使用MySQLDB，则需要使用以下命令之一.哪一个取决于您拥有和使用的操作系统和软件.

Step 1 If you want to use MySQLDB you need to use one of the following commands. Which one depends on what OS and software you have and use.

easy_install mysql-python(混合OS)

pip install mysql-python(mix os/python 2)

pip install mysql-python (mix os/ python 2)

pip install mysqlclient(mix os/python 3)

pip install mysqlclient (mix os/ python 3)

apt-get install python-mysqldb(Linux Ubuntu，...)

apt-get install python-mysqldb (Linux Ubuntu, ...)

cd /usr/ports/databases/py-MySQLdb && make install clean(FreeBSD)

yum install MySQL-python(Linux Fedora，CentOS ...)

yum install MySQL-python (Linux Fedora, CentOS ...)

对于Windows，请参见以下答案:

For Windows, see this answer: Install mysql-python (Windows)

第2步:

1. 创建引擎

engine = create_engine('mysql+mysqldb://...', pool_recycle=3600)

使用create_engine.pool_recycle选项，以确保如果连接在池中存在固定的秒数，则该连接将被丢弃并替换为新的连接:

use the create_engine.pool_recycle option which ensures that a connection will be discarded and replaced with a new one if it has been present in the pool for a fixed number of seconds:

1. 创建连接对象

conn = engine.connect()

1. 执行SQL查询

conn.execute("SELECT * From table;")

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