In Django,
Models are used to define the database models. To apply these models we need run migration. Migration is used to allow us to make any changes to our database even after it was created and the data in that database. It acts like version control of our database and also used to manually it generates SQL queries.
Run this command after modifying your models:
<pre><code class="lang-bash">python manage.py makemigrations
</code></pre>
To update the database schema, run:
<pre><code class="lang-bash">python manage.py migrate
</code></pre>
This executes the migration file and modifies the database accordingly. Django ORM is a Object Relational Mapping is a built in that you to allow ta interact with database using python code instead of using SQL queries.
For ex: Creating Records (INSERT)
In SQL:
<pre><code class="lang-sql">INSERT INTO post (title, content, author_id) VALUES ('My First Post', 'This is Django ORM', 1);
</code></pre>
<pre><code class="lang-bash">post = Post(title="My First Post", content="This is Django ORM", author=user)
post.save()
</code></pre>
<pre><code class="lang-bash">python manage.py shell
</code></pre>
Django Shell is an environment where you run Django ORM queries directly in the terminal without writing a script. The main thing is it allows direct interaction with Django models using python.
For ex: Retrieve the data from the model.
<pre><code class="lang-python">from blog.models import Post 

posts = Post.objects.all()
print(posts)
</code></pre>

In Django,

Models are used to define the database models. To apply these models we need run migration. Migration is used to allow us to make any changes to our database even after it was created and the data in that database. It acts like version control of our database and also used to manually it generates SQL queries.

Run this command after modifying your models:

```bash
python manage.py makemigrations
```

To update the database schema, run:

```bash
python manage.py migrate
```

This executes the migration file and modifies the database accordingly. Django ORM is a Object Relational Mapping is a built in that you to allow ta interact with database using python code instead of using SQL queries.

For ex: **Creating Records (INSERT)**

In SQL:

```sql
INSERT INTO post (title, content, author_id) VALUES ('My First Post', 'This is Django ORM', 1);
```

```bash
post = Post(title="My First Post", content="This is Django ORM", author=user)
post.save()
```

```bash
python manage.py shell
```

Django Shell is an environment where you run Django ORM queries directly in the terminal without writing a script. The main thing is it allows direct interaction with Django models using python.

For ex: Retrieve the data from the model.

```python
from blog.models import Post 

posts = Post.objects.all()
print(posts) 
```

Django Models And Migrations