objects.all() will retrieve a full list of objects stored in the database for this model. Retrieving and Displaying models > ()Ĭalling.
Calling save() will update this row in the database. Now, these lines updated the Sender object, replacing some values. Updating models sender.name = "Real Name" After all, the sender will have a new ID (sender.id) assigned by the database. Then call save() to store this item in the database. These lines created a new Sender object, filling their values. Creating models sender = name="Me Myself", imageUrl = " sender.save() The second one imports the timezone object to deal with date/time operations. The first line imports the objects Sender and Message associated to the tables created in the migration. Some useful commands to execute:įrom example.models import Sender, Message Now you have a console to execute python commands. You can start a special python console ready to work with your application and models: Instead of running specific and complicated SQL commands, you can play with the Database functions provided by Django and Python. Note: This output could vary between different versions of the SQLite database. CREATE TABLE "example_sender" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "name" varchar(200) NOT NULL, "email" varchar(200) NOT NULL, "imageUrl" varchar(250) NOT NULL)
CREATE TABLE "example_message" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "sender" varchar(200) NOT NULL, "recipient" varchar(200) NOT NULL, "message" varchar(200) NOT NULL, "visible" integer NOT NULL, "timestamp" datetime NOT NULL) It will show a list of SQL commands: BEGIN
If you are insterested in view how it looks the migration code in plain SQL, you can use the sqlmigrate command: Python manage.py migrate Operations to perform:Īpply all migrations: admin, auth, contenttypes, example, sessionsĪfter that, your new tables will be created in the SQLite database. Now, a new file created example/migrations/ 0001_initial.py contains a set of commands to create your tables. Python manage.py makemigrations Migrations for 'example': Now you can create the tables defined in models.py by creating a migration file (A file to execute the creation of each table): In each case, you can use the field or a combinations of values. The _str_(self) method is used to get a String representation of the object (like.
In this project we created a webapp project, and an example application. In this guide, we continue from the previous post Web Applications using Python and Django.
There are the main steps to get your models and application working with a Database. After creating your Django web application, you can start using Database models in Python and Django.