尝试将MySQL与sqlalchemy(Flask)连接时出错 [英] Error while trying to connect MySQL with sqlalchemy (Flask)

问题描述

我一直在寻找此错误已有一段时间，但似乎没有什么可以解决我的问题，实际上是..我在烧瓶中使用了sqlite3，但似乎sqlite3不支持迁移，因此我决定更改为Mysql.我已经安装了LAMPP，并从以下位置创建了Symbolik链接:

I have been looking for this error for a while but nothing seems to solve my problem, the thing is.. I was using sqlite3 with flask, but it seems like sqlite3 does not support migrations, so I decided to change to Mysql. I have installed LAMPP, and I created a symbolik link from:

/opt/lampp/var/mysql/mysql.sock

收件人:

/var/run/mysqld/mysql.sock

但仍然出现此错误(虽然有点长，但最后一行重现了麻烦):

but still I get this error (it is a little long but the trouble relapse on the last line):

Traceback (most recent call last):
File "db_create.py", line 5, in <module>
db.create_all()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 895, in create_all
self._execute_for_all_tables(app, bind, 'create_all')
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 887, in _execute_for_all_tables
op(bind=self.get_engine(app, bind), **extra)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/schema.py", line 3634, in create_all
tables=tables)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1851, in _run_visitor
with self._optional_conn_ctx_manager(connection) as conn:
File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1844, in _optional_conn_ctx_manager
with self.contextual_connect() as conn:
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 2035, in contextual_connect
self._wrap_pool_connect(self.pool.connect, None),
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 2074, in _wrap_pool_connect
e, dialect, self)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1405, in _handle_dbapi_exception_noconnection
exc_info
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 2070, in _wrap_pool_connect
return fn()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 376, in connect
return _ConnectionFairy._checkout(self)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 708, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 480, in checkout
rec = pool._do_get()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 1055, in _do_get
self._dec_overflow()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 1052, in _do_get
return self._create_connection()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 323, in _create_connection
return _ConnectionRecord(self)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 449, in __init__
self.connection = self.__connect()
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/pool.py", line 602, in __connect
connection = self.__pool._invoke_creator(self)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 97, in connect
return dialect.connect(*cargs, **cparams)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 385, in connect
return self.dbapi.connect(*cargs, **cparams)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/MySQLdb/__init__.py", line 81, in Connect
return Connection(*args, **kwargs)
File "/home/gerardo/Documentos/python_web_dev/flask-intro/venv/local/lib/python2.7/site-packages/MySQLdb/connections.py", line 193, in __init__
super(Connection, self).__init__(*args, **kwargs2) 
sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2002, "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)")

在我的研究中，我发现必须更改行:

On my research, I found that I have to change the line:

socket      = /var/run/mysqld/mysqld.sock

放在/etc/mysql/my.cnf上:

placed on /etc/mysql/my.cnf to:

socket      = /opt/lampp/var/mysql/mysql.sock

(路径位于"mysql.sock")，但是仍然不能解决我的问题.谢谢！

(The path were "mysql.sock" is located), but still it does not solve my problem. Thank you!

推荐答案

在数据库配置中.将替换为 127.0.0.1 :

environ.get('APP_DATABASE_HOST'，'localhost')

到

environ.get('APP_DATABASE_HOST'，'127.0.0.1')

这篇关于尝试将MySQL与sqlalchemy(Flask)连接时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！