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django：数据库修改工具South的正确使用方式

 

如果你在使用south，然而并没有遇到本文所提到的错误，我则建议你跳到本文的第三部分看一看，我想ken的详尽建议可能对你也会有所帮助。

1 什么是south

由于django 的syncdb只能在数据库创建的时候发挥作用，而对Model进行更改之后再运行syncdb是不能将更改反映到数据库中的。只能就要自己使用其他原始而蹩脚的方式进行修改操作。south就是解决这个问题的工具。

2 遵守south手册带来的错误

你也许按照south手册的要求，进行了以下操作：

1）首先创建了一个数据库

	create database mydb;

2）然后把“south”放在settings.py中的INSTALLED_APPS 然后在console中执行以下命令

	$ python manage.py  schemamigration wall --initial

  这步没问题

	$ python manage.py migrate wall

  这条命令则报出了以下错误

?
<SPAN style="BACKGROUND-COLOR: #c0c0c0">Skipping creation of NoticeTypes as notification app not found
Running migrations for profiles:
 - Migrating forwards to 0002_auto__add_field_interest_created_on__add_field_profile_created_on__add.
 > profiles:0001_initial
south execute "CREATE TABLE "profiles_profile" ("id" integer NOT NULL PRIMARY KEY, "user_id" integer NOT NULL UNIQUE, "first_name" varchar(30) NOT NULL, "last_name" varchar(30) NOT NULL, "location" varchar(255) NOT NULL, "image" varchar(100) NOT NULL, "bio" text NOT NULL);" with params "[]"
Traceback (most recent call last):
  File "manage.py", line 26, in <module>
    execute_manager(settings)
  File "/Library/Python/2.6/site-packages/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
  File "/Library/Python/2.6/site-packages/django/core/management/__init__.py", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 220, in execute
    output = self.handle(*args, **options)
  File "/Library/Python/2.6/site-packages/south/management/commands/migrate.py", line 105, in handle
    ignore_ghosts = ignore_ghosts,
  File "/Library/Python/2.6/site-packages/south/migration/__init__.py", line 191, in migrate_app
    success = migrator.migrate_many(target, workplan, database)
  File "/Library/Python/2.6/site-packages/south/migration/migrators.py", line 221, in migrate_many
    result = migrator.__class__.migrate_many(migrator, target, migrations, database)
  File "/Library/Python/2.6/site-packages/south/migration/migrators.py", line 292, in migrate_many
    result = self.migrate(migration, database)
  File "/Library/Python/2.6/site-packages/south/migration/migrators.py", line 125, in migrate
    result = self.run(migration)
  File "/Library/Python/2.6/site-packages/south/migration/migrators.py", line 99, in run
    return self.run_migration(migration)
  File "/Library/Python/2.6/site-packages/south/migration/migrators.py", line 81, in run_migration

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