在 Django 中，使用 manage.py 从 CLI 清除数据库最简单的方法是什么？

我使用 Django 来建立一个网站与 MySQL。现在，因为我正在学习，所以我需要改变模型非常频繁，所以我希望所有的表得到清除和新的表得到创建。

但是 syncdb并不涉及现有的表。有什么更好的方法来处理这个问题吗？

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最佳答案

If you don't care about data:

Best way would be to drop the database and run syncdb again. Or you can run:

For Django >= 1.5

python manage.py flush

For Django < 1.5

python manage.py reset appname

(you can add --no-input to the end of the command for it to skip the interactive prompt.)

If you do care about data:

From the docs:

syncdb will only create tables for models which have not yet been installed. It will never issue ALTER TABLE statements to match changes made to a model class after installation. Changes to model classes and database schemas often involve some form of ambiguity and, in those cases, Django would have to guess at the correct changes to make. There is a risk that critical data would be lost in the process.

If you have made changes to a model and wish to alter the database tables to match, use the sql command to display the new SQL structure and compare that to your existing table schema to work out the changes.

https://docs.djangoproject.com/en/dev/ref/django-admin/

Reference: FAQ - https://docs.djangoproject.com/en/dev/faq/models/#if-i-make-changes-to-a-model-how-do-i-update-the-database

People also recommend South ( http://south.aeracode.org/docs/about.html#key-features ), but I haven't tried it.

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Quickest (drops and creates all tables including data):

./manage.py reset appname | ./manage.py dbshell

Caution:

  • Might not work on Windows correctly.
  • Might keep some old tables in the db
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Using Django Extensions, running:

./manage.py reset_db

Will clear the database tables, then running:

./manage.py syncdb

Will recreate them (south may ask you to migrate things).

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I think Django docs explicitly mention that if the intent is to start from an empty DB again (which seems to be OP's intent), then just drop and re-create the database and re-run migrate (instead of using flush):

If you would rather start from an empty database and re-run all migrations, you should drop and recreate the database and then run migrate instead.

So for OP's case, we just need to:

  1. Drop the database from MySQL
  2. Recreate the database
  3. Run python manage.py migrate
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You can use the Django-Truncate library to delete all data of a table without destroying the table structure.

Example:

  1. First, install django-turncate using your terminal/command line:
pip install django-truncate
  1. Add "django_truncate" to your INSTALLED_APPS in the settings.py file:
INSTALLED_APPS = [
...
'django_truncate',
]
  1. Use this command in your terminal to delete all data of the table from the app.
python manage.py truncate --apps app_name --models table_name

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