Question

我从pgAdmin III中删除了我的postgresql数据库（右键单击databases / mydatabase =＆gt;删除/删除）。

现在我想重新开始并进行应该创建数据库的第一次迁移，但它会产生错误：数据库不存在。

到目前为止，我使用的是sqlite3，这个程序很有效。我该怎么做？

完整traceback：

(myvenv) c:\Python34\Scripts\possedimenti\sitopossedimenti>manage.py migrate
Traceback (most recent call last):
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 199, in ensure_connection
    self.connect()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 171, in connect
    self.connection = self.get_new_connection(conn_params)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\postgresql\base.py", line 175, in get_new_connection
    connection = Database.connect(**conn_params)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\psycopg2\__ini
t__.py", line 164, in connect
    conn = _connect(dsn, connection_factory=connection_factory, async=async)
psycopg2.OperationalError: FATALE:  il database "possedimenti_database" non esis
te


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

Traceback (most recent call last):
  File "C:\Python34\Scripts\possedimenti\sitopossedimenti\manage.py", line 10, i
n <module>
    execute_from_command_line(sys.argv)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\core\ma
nagement\__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\core\ma
nagement\__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\core\ma
nagement\base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\core\ma
nagement\base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\core\ma
nagement\commands\migrate.py", line 89, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\migr
ations\executor.py", line 20, in __init__
    self.loader = MigrationLoader(self.connection)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\migr
ations\loader.py", line 49, in __init__
    self.build_graph()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\migr
ations\loader.py", line 176, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\migr
ations\recorder.py", line 65, in applied_migrations
    self.ensure_schema()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\migr
ations\recorder.py", line 52, in ensure_schema
    if self.Migration._meta.db_table in self.connection.introspection.table_name
s(self.connection.cursor()):
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 231, in cursor
    cursor = self.make_debug_cursor(self._cursor())
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 204, in _cursor
    self.ensure_connection()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 199, in ensure_connection
    self.connect()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\util
s.py", line 95, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\utils\s
ix.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 199, in ensure_connection
    self.connect()
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\base\base.py", line 171, in connect
    self.connection = self.get_new_connection(conn_params)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\django\db\back
ends\postgresql\base.py", line 175, in get_new_connection
    connection = Database.connect(**conn_params)
  File "c:\Python34\Scripts\possedimenti\myvenv\lib\site-packages\psycopg2\__ini
t__.py", line 164, in connect
    conn = _connect(dsn, connection_factory=connection_factory, async=async)
django.db.utils.OperationalError: FATALE:  il database "possedimenti_database" n
on esiste

Answer 1

首次迁移不会创建数据库，它需要现有数据库才能在其中创建表。

从终端创建postgres数据库：

createdb -U postgres possedimenti_database

您可能必须将上述命令中的postgres替换为您的数据库用户。

Answer 2

检查数据库的settings.py中的详细信息。使用完全相同的详细信息（端口号，用户，主机，密码等）重新创建PostgreSQL数据库。在此处尝试此现有解决方案链接：

PostgreSQL - create a new DB through pgAdmin UI，以便通过pgAdmin

创建数据库

Operationalerror：数据库不存在

2 个答案: