我正在尝试使用Django多数据库配置,MYSQL作为我的默认数据库,redshift作为我的分析数据库。我的配置看起来像这样:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'xxxx',
'USER': 'xxxx',
'PASSWORD': 'xxxx',
'HOST': 'localhost',
},
'analytics': {
'NAME': 'analytics',
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'USER': 'XXXXXXXXX',
'PASSWORD': 'XXXXX',
'HOST': 'XXXXX.us-east-1.redshift.amazonaws.com',
'PORT': 5439,
}
}
当我尝试使用以下命令迁移我的分析应用时
python manage.py migrate analytics --database analytics
我看到以下错误:
File "/opt/envs/cinematique/bin/django-admin.py", line 5, in <module>
management.execute_from_command_line()
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 60, in handle
return self.show_migration_list(connection, args)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 308, in show_migration_list
loader = MigrationLoader(connection, ignore_no_migrations=True)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 48, in __init__
self.build_graph()
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 183, in build_graph
self.applied_migrations = recorder.applied_migrations()
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/migrations/recorder.py", line 59, in applied_migrations
self.ensure_schema()
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/migrations/recorder.py", line 53, in ensure_schema
editor.create_model(self.Migration)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/backends/schema.py", line 270, in create_model
self.execute(sql, params)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/backends/schema.py", line 111, in execute
cursor.execute(sql, params)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/opt/envs/cinematique/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.NotSupportedError: Column "django_migrations.id" has unsupported type "serial".
有关如何解决此问题的任何想法?我正在使用Django==1.7.9
和psycopg2==2.6.1
答案 0 :(得分:2)
具体问题是:Django希望创建一个带有serial
主键的迁移管理表来跟踪迁移历史记录。 Redshift不支持。
但是,该方法的一般问题是,您并不真正想要在Redshift数据库上进行Django式迁移(请参阅How to change table schema after created in Redshift?之类的内容)。 Redshift适用于庞大的数据库,更改它的架构可能是一项重量级的工作。
所以,答案是:不要使用redshift进行Django迁移。 Syncdb可能没问题,可以初始化表,但之后您需要手动管理模式。不要在其模型适用于Redshift的应用中创建migrations__init__.py文件。
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