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This article mainly introduces "the steps of building Django framework". In the daily operation, I believe that many people have doubts about the steps of building Django framework. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts about the steps of building Django framework. Next, please follow the editor to study!

First, install the Django package

Open Anaconda Prompt and install the Django package using pip

Pip install Django

Create a Django project

Open Intellij Idea and create a Django project. When you create a new project, select the python environment that has been created (I just want to Anaconda the directory of the py environment that has been configured). Application Name can be empty, and then create it later.

Here you create a project called IntellijPythonTest

Then open the lower left corner, Terminal command line mode, type the following command to create app, when finished, refresh the directory, you can see the simple directory of app

Python manage.py startapp app name Chestnut: python manage.py startapp blog

Then we execute the following two lines of commands to survive the sqlite database and start the server to run the project

# Update database operation. If there is no db.sqlite3 database file, python manage.py migrate# starts the server, port 8000python manage.py runserver localhost:8000

Open the browser and you can see the default home page

Third, about the error solution of TypeError: view must be a callable or a list/tuple in the case of include ()

The current Django version is 2.2.3

Because after Django 1.10, it is not allowed to specify views as strings in URL mode, you need to introduce the views into the file, as shown in the code Chestnut:

From blog import views as blogurl (r'^ blog/$', blog.hello, name='blog')

4. Models entity object layer

After establishing the corresponding entity objects in models.py, use the makemigration command to synchronize the model creation to the migrate operation, and then execute the migrate command to update the database operation.

# perform model creation and synchronize to migrate operation python manage.py makemigrations# synchronize model to database operation, update database (after Django 1.9, migrate command replaces syncdb) python manage.py migrate

Register the model in admin.py so that we can see the corresponding model object information and use it later in the built-in background management, which is said in advance here, or if you don't see the blog module on the management page in step 7, come back and write

About TypeError: _ _ init__ () missing 1 required positional argument: 'on_delete' error solution

An error was reported when declaring the foreign key relationship of the entity object. The following is the problem of rewriting. After the Django2.0 version, you need to add the on_delete option when defining the foreign key relationship.

Change author = models.ForeignKey (Author) to author = models.ForeignKey (Author, on_delete=models.CASCADE)

On_delete has five optional values: CASCADE, PROTECT, SET_NULL, SET_DEFAULT, and SET ()

CASCADE: this value setting is cascaded deletion

PROTECT: when this value is set, integrity error will be reported.

SET_NULL: if this value is set, the foreign key will be set to null, provided that null is allowed.

SET_DEFAULT: this value will be set to the default value of the foreign key.

SET (): this value setting calls the outside value, which can be a function

VI. Basic operation of sqlite3

You can manipulate the generated sqlite database by typing the following command in terminal

# enter the database and display the version number information # example: sqlite3 database name .sqlite3 # Ben Chestnut: sqlite3 db.sqlite3# sqlite > shows that it has entered the sqlite database command line mode # shows the tables that have been created in the database. Tables # exits the sqlite command line. Exit

7. Background management (create super administrator, create test data)

Go back to terminal and start creating the Super Admin account. Enter the following command and enter the information in turn to complete the creation.

Python manage.py createsuperuser

Remember that if you have commented out the admin default link jump in urls.py, release the comments, then restart the server and enter the background management page at the following address

Http://localhost:8000/admin

We can see the Article and Authors model objects created earlier in the code. Django can encapsulate a series of database operations in this simple background, and we can directly add data to the sqlite database through operations such as Add.

At this point, the study on the "steps to build the Django framework" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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