How can you set up and use a database in a Django project?

In Django, database configuration and usage are done through the project's settings.py file.

1. In the DATABASES section, connection parameters are specified, for example:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydatabase',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': 'localhost',
        'PORT': '5432',
    }
}

2. After configuration, you need to create model migrations and apply them:

django-admin makemigrations
python manage.py migrate

3. To work with the database in code, Django ORM models are used:

from django.db import models

class Product(models.Model):
    name = models.CharField(max_length=100)
    price = models.DecimalField(max_digits=10, decimal_places=2)

4. To perform queries:

products = Product.objects.filter(price__gt=100)

Thus, Django simplifies working with the database by providing a convenient ORM and migration tools.