v211-200捕鱼机多少钱

書名： Learning Website Development with Django
作者名： Ayman Hourieh
本章字?jǐn)?shù)： 229字
更新時(shí)間： 2021-07-02 11:41:17

Summary

In this chapter, we learned about the three main components of Django: the view, model and template. We wrote data models to store the data of our application, and then created views and templates to display this data. We also learned how to map URLs to views, and how to use the interactive console to experiment with our Django project.

Below is a summary of the Django features covered in this chapter:

To create an application within a project, run the following command:
```
$ python manage.py startapp <app-name>
```
After writing a data model, the following command should be run to create the corresponding tables in the database:
```
$ python manage.py syncdb
```
To view the SQL queries generated by Django, issue the following command:
```
$ python manage.py sql <app-name>
```
Data models provide a variety of methods to interact with the database engine:
- The save method saves an object into the database.
- The objects.get method retrieves an object by a unique field.
- The objects.all method retrieves a list of all objects.
- The delete method deletes an object from the database.
To generate a 404 "Page Not Found" error, raise an exception of type type Http404.

In the next chapter, we will continue developing our application, but we will focus mostly on user management features, such as registration and logging in. The next chapter provides a lot of useful information, so read on!

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Learning Website Development with Django

Summary