[파이썬] Peewee BinaryField 활용

06 Sep 2023

Peewee

In this blog post, we will explore how to use the BinaryField in Peewee - a simple and lightweight Object-Relational Mapping (ORM) library for Python.

What is BinaryField?

In Peewee, BinaryField is a field type that allows us to store binary data in the database. It can be used to store various types of data, such as images, files, and serialized objects.

Why use BinaryField?

Using BinaryField can be useful in many scenarios, such as:

Storing and retrieving files or binary data directly from the database without the need for an external file system.
Serializing complex data structures and storing them as binary data in the database, simplifying the process of saving and retrieving the data.

Example Usage

Let’s see how we can use the BinaryField in a Peewee model.

First, we need to define our model class. For this example, let’s create a model called BinaryData with a BinaryField to store binary data:

from peewee import *

# Define the database connection
database = SqliteDatabase('my_database.db')

# Define the model
class BinaryData(Model):
    data = BinaryField()

    class Meta:
        database = database

We have defined a model class called BinaryData with a single field, data, which is of type BinaryField.

Next, let’s create a table in the database and insert some binary data:

# Create the table
database.create_tables([BinaryData])

# Create a binary data object
binary_data = BinaryData(data=b'\x00\x01\x02\x03\x04')

# Save the binary data to the database
binary_data.save()

In the above example, we created a table for the BinaryData model using the database.create_tables() method. We then created an instance of the BinaryData model and assigned a binary data to the data field. Finally, we saved the binary data to the database using the save() method.

To retrieve the binary data from the database, we can use a simple query like this:

# Retrieve the binary data from the database
retrieved_data = BinaryData.get()

print(retrieved_data.data)  # Output: b'\x00\x01\x02\x03\x04'

In this case, we used the BinaryData.get() method to retrieve the first instance of the BinaryData model from the database. We then accessed the data field to retrieve the binary data.

Conclusion

In this blog post, we explored how to use the BinaryField in Peewee to store and retrieve binary data in the database. We saw how to define a model with a BinaryField, save binary data to the database, and retrieve it later. BinaryField can be a powerful tool when working with binary data in your Python applications.

Try experimenting with the BinaryField in your own projects and see how it can simplify data storage and retrieval!