Peewee is a lightweight and expressive Object-Relational Mapping (ORM) library for Python. It provides an easy and intuitive way to interact with databases in your Python applications. One useful feature of Peewee is the ability to sort and order query results.

In this blog post, we will explore how to perform sorting and ordering operations using Peewee in Python.

Sorting Query Results

Sorting query results allows you to arrange the records returned by a query in a specific order. Peewee provides a order_by() method that can be used to specify the sorting order.

Here’s an example that demonstrates how to sort records in ascending order by a specific field:

from peewee import *

# Define your database and model classes

# Connect to the database
database = SqliteDatabase('mydatabase.db')

# Define your model classes
class User(Model):
    name = CharField()
    age = IntegerField()

    class Meta:
        database = database

# Create a query to fetch all users and sort them by age in ascending order
users = User.select().order_by(User.age.asc())

# Iterate over the sorted users
for user in users:
    print(user.name, user.age)

In the example above, we first define a User model with name and age fields. We then create a query to select all users and sort them by age in ascending order using User.age.asc(). Finally, we iterate over the sorted users and print their names and ages.

Ordering Query Results

In addition to sorting, Peewee also allows you to specify the order in which the records should be fetched using the order_by() method.

Here’s an example that demonstrates how to specify the order of records in a query:

from peewee import *

# Define your database and model classes

# Connect to the database
database = SqliteDatabase('mydatabase.db')

# Define your model classes
class User(Model):
    name = CharField()
    age = IntegerField()

    class Meta:
        database = database

# Create a query to fetch all users and order them by name in descending order
users = User.select().order_by(User.name.desc())

# Iterate over the ordered users
for user in users:
    print(user.name, user.age)

In this example, we create a query to select all users and order them by name in descending order using User.name.desc(). The ordered users are then iterated over and their names and ages are printed.

By combining sorting and ordering, you can effectively control the output of your queries and retrieve the records in the desired format.

Conclusion

In this blog post, we explored how to perform sorting and ordering operations using Peewee in Python. We learned how to use the order_by() method to sort query results and specify the order in which records should be fetched.

With these capabilities, you can easily manipulate and organize the data from your database queries in a way that meets your application’s requirements. Peewee’s simplicity and flexibility make it a powerful tool for working with databases in Python.

Feel free to experiment with different sorting and ordering options to customize your query results. Happy coding!