我一直在寻找这个错误，但似乎没有解决我的问题，事情是...... 我正在使用带烧瓶的sqlite3，但似乎sqlite3不支持迁移，所以我决定改为Mysql。我已经安装了LAMPP，并且我创建了一个symbolik链接：
/opt/lampp/var/mysql/mysql.sock
为：
/var/run/mysqld/mysql.sock
但我仍然得到这个错误（它有点长，但最后一行的麻烦复发）：
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，我发现我必须改变这条线：
socket = /var/run/mysqld/mysqld.sock
放在/etc/mysql/my.cnf上：
socket = /opt/lampp/var/mysql/mysql.sock
（路径是“mysql.sock”所在的位置），但它仍然无法解决我的问题。谢谢！
答案 0 :(得分：0)
在数据库配置中。用127.0.0.1替换localhost：
environ.get('APP_DATABASE_HOST', 'localhost')
到
environ.get('APP_DATABASE_HOST', '127.0.0.1')