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初识别一些命令行

python manage.py migrate

migrate 命令检查 INSTALLED_APPS 设置,为其中的每个应用创建需要的数据表,至于具体会创建什么,这取决于你的 mysite/settings.py 设置文件和每个应用的数据库迁移文件

python manage.py makemigrations polls

创建好应用后,添加到 INSTALLED_APPS,DJango项目包含了该应用

通过运行makemigrations命令,Django会检测你对模型文件的修改,并且把修改的部分存储为一次迁移。

查看迁移过程的文件命令(如:0001_initial.py):

python manage.py sqlmigrate polls 0001

可以查看到sql语句。

再次执行migrate命令,在数据库中创建新定义的模型的数据表:

python manage.py migrate

改变模型的三个步骤:

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