Question

首先，我在Windows 10上。

我刚刚开始学习Django。我做了Django文档附带的教程。我需要编写一个使用PostgreSQL数据库的应用程序。这是在面试之后进行的一次测试，所以我不想弄乱它。

当我运行命令“ python manage.py runserver”时，遇到以下错误：

d:\Utilisateur\Documents\code\code_python\Django\Psycle_test\mysite>python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
    self.connect()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
    self.connection = self.get_new_connection(conn_params)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\postgresql\base.py", line 178, in get_new_connection
    connection = Database.connect(**conn_params)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\psycopg2\__init__.py", line 126, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: Connection refused (0x0000274D/10061)
        Is the server running on host "127.0.0.1" and accepting
        TCP/IP connections on port 5432?

Django文档说我需要安装psycopg2。我使用命令“ pip install psycopg2”完成了该操作。我在Django项目中配置了settings.py以便使用PostgreSQL数据库：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'myDataBase',
        'USER': 'myDataBaseUser',
        'PASSWORD': 'password',
        'HOST': '127.0.0.1',
        'PORT': '5432',
    }
}

将'ENGINE'：'django.db.backends.postgresql'更改为'ENGINE'：'django.db.backends.postgresql_psycopg2'给我同样的错误。

我还尝试将'127.0.0.1'更改为'localhost'，但仍然无法正常工作。

（我见过的不同主题都在谈论一个postgresql.conf文件，但是即使它仍然可以解决任何问题，我似乎也找不到它）。

我在做什么错了？

编辑

在安装PostgreSQL 9.6，创建myDataBase，创建角色myDataBaseUser并授予该角色特权之后，我现在得到该错误：

d:\Utilisateur\Documents\code\code_python\Django\Psycle_test\mysite>python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
    self.connect()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
    self.connection = self.get_new_connection(conn_params)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\postgresql\base.py", line 178, in get_new_connection
    connection = Database.connect(**conn_params)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\psycopg2\__init__.py", line 126, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\management\commands\runserver.py", line 120, in inner_run
    self.check_migrations()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\management\base.py", line 453, in check_migrations
    executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\migrations\executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\migrations\loader.py", line 49, in __init__
    self.build_graph()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\migrations\loader.py", line 212, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\migrations\recorder.py", line 73, in applied_migrations
    if self.has_table():
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\migrations\recorder.py", line 56, in has_table
    return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 256, in cursor
    return self._cursor()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 233, in _cursor
    self.ensure_connection()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
    self.connect()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
    self.connect()
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
    self.connection = self.get_new_connection(conn_params)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\django\db\backends\postgresql\base.py", line 178, in get_new_connection
    connection = Database.connect(**conn_params)
  File "C:\Users\Utilisateur\AppData\Local\Programs\Python\Python36\lib\site-packages\psycopg2\__init__.py", line 126, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError

Answer 1

似乎您没有在本地安装postgres数据库。从here

下载

然后进入控制台，您需要通过create database myDataBase;

创建数据库

通过create role myDataBaseUser with password 'password'创建角色。通过

授予角色特权

grant all privileges on database "myDataBase" to myDataBaseUser。

那么你会能够连接。

为什么我不能使用PostgreSQL运行Django项目？

编辑

1 个答案: