架構遷移與南（Django的）和MySQL

我只是通過教程事情Django的，我跟着亦步亦趨，但我仍然得到這個錯誤每次我嘗試遷移時間：架構遷移與南（Django的）和MySQL

最初的遷移工作，但是，試圖遷移它，我得到這個：

[email protected]:/Sites/tumblog# ./manage.py migrate blog 

    Traceback (most recent call last): 
    File "manage.py", line 11, in <module> 
    execute_manager(settings) 
    File "/usr/lib/pymodules/python2.6/django/core/management/__init__.py", line 438, in execute_manager 
    utility.execute() 
    File "/usr/lib/pymodules/python2.6/django/core/management/__init__.py", line 379, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/usr/lib/pymodules/python2.6/django/core/management/base.py", line 191, in run_from_argv 
    self.execute(*args, **options.__dict__) 
    File "/usr/lib/pymodules/python2.6/django/core/management/base.py", line 220, in execute 
    output = self.handle(*args, **options) 
    File "/usr/lib/pymodules/python2.6/south/management/commands/migrate.py", line 102, in handle 
    delete_ghosts = delete_ghosts, 
    File "/usr/lib/pymodules/python2.6/south/migration/__init__.py", line 202, in migrate_app 
    success = migrator.migrate_many(target, workplan, database) 
    File "/usr/lib/pymodules/python2.6/south/migration/migrators.py", line 215, in migrate_many 
    result = migrator.__class__.migrate_many(migrator, target, migrations, database) 
    File "/usr/lib/pymodules/python2.6/south/migration/migrators.py", line 284, in migrate_many 
    result = self.migrate(migration, database) 
    File "/usr/lib/pymodules/python2.6/south/migration/migrators.py", line 121, in migrate 
    result = self.run(migration) 
    File "/usr/lib/pymodules/python2.6/south/migration/migrators.py", line 95, in run 
    return self.run_migration(migration) 
    File "/usr/lib/pymodules/python2.6/south/migration/migrators.py", line 77, in run_migration 
    migration_function() 
    File "/usr/lib/pymodules/python2.6/south/migration/migrators.py", line 56, in <lambda> 
    return (lambda: direction(orm)) 
    File "/Site/tumblog/blog/migrations/0005_initial.py", line 17, in forwards 
    ('name', self.gf('django.db.models.fields.CharField')(max_length=255)), 
    File "/usr/lib/pymodules/python2.6/south/db/generic.py", line 210, in create_table 
    ', '.join([col for col in columns if col]), 
    File "/usr/lib/pymodules/python2.6/south/db/generic.py", line 134, in execute 
    cursor.execute(sql, params) 
    File "/usr/lib/pymodules/python2.6/django/db/backends/util.py", line 15, in execute 
    return self.cursor.execute(sql, params) 
    File "/usr/lib/pymodules/python2.6/django/db/backends/mysql/base.py", line 86, in execute 
    return self.cursor.execute(query, args) 
    File "/usr/lib/pymodules/python2.6/MySQLdb/cursors.py", line 166, in execute 
    self.errorhandler(self, exc, value) 
    File "/usr/lib/pymodules/python2.6/MySQLdb/connections.py", line 35, in defaulterrorhandler 
    raise errorclass, errorvalue 
_mysql_exceptions.OperationalError: (1050, "Table 'blog_blog' already exists")

我搜索了一圈，發現了，添加--fake將跳過這個錯誤，但它不會改變任何事情？這裏有什麼問題，我該如何解決它？

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2011-10-13 vedran

您的遷移中實際發生了什麼？如果你得到這個錯誤，那麼簡單的create_table被調用兩次，blog_blog或blog_blog在初始遷移之前已經存在於你的數據庫中（可能是從前一次嘗試創建一個永遠不會遷移到零的博客）。

如果錯誤在初始遷移完成之前發生，那麼它很可能是工件，您可以手動將它從數據庫中刪除並重試。如果初始遷移成功但稍後遷移失敗，請找到blog_blog有重複的create_table。

來源

2011-10-13 22:10:47

您確定添加了--fake並沒有改變任何東西嗎？

...或刪除表從MySQL控制檯手動「blog_blog」;）

來源

2011-10-13 21:10:37 Krzysztof

的問題是，在遷移過程試圖創建的表在數據庫中存在。它們必須已經使用syncdb創建（如果您的操作是syncdb，並且以後要開始使用南方的應用），或者通過以前的遷移，您可以創建它們。

這是可疑的遷移的名字是0005_initial。什麼是遷移0001-0004在做什麼？

要解決您的問題，您應該首先確保您沒有重複的遷移（例如，0001_initial創建表，然後0005_initial會再次嘗試）。您只需要爲應用程序進行一次初始遷移，接下來應該只記錄架構的更改。

然後，從數據庫中刪除表並重新創建它們。類似的東西可能工作：

./manage.py migrate [appname] --fake 
./manage.py migrate [appname] zero 
./manage.py migrate [appname]

如果失敗（它將，如果在遷移現有的和新表） - 那麼你必須用手在mysql控制檯中刪除表。

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2011-10-13 22:10:10 rczajka

架構遷移與南（Django的）和MySQL

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