Kivy Tutorial: How to do CRUD Method with Kivy & Json File – Part 5

In the previous parts of this tutorial, we have learned how to create, read, and delete data from a JSON file using Kivy. In this part, we will focus on updating the data in the JSON file. This process is also known as the CRUD (Create, Read, Update, Delete) method.

Updating JSON Data

To update data in a JSON file using Kivy, we can follow these steps:

1. Load the JSON data into the Kivy app.
2. Find the data we want to update and make the necessary changes.
3. Save the updated data back to the JSON file.

Example

Let’s consider an example where we have a JSON file named “data.json” with the following content:

{
    "users": [
        {
            "id": 1,
            "name": "John Doe",
            "age": 25
        },
        {
            "id": 2,
            "name": "Jane Smith",
            "age": 30
        }
    ]
}

Now, let’s say we want to update the age of the user with id 1 to 30. Here’s how we can achieve this using Kivy:

import json

# Load the JSON data
with open('data.json', 'r') as file:
    data = json.load(file)

# Find the user with id 1 and update the age
for user in data['users']:
    if user['id'] == 1:
        user['age'] = 30

# Save the updated data back to the JSON file
with open('data.json', 'w') as file:
    json.dump(data, file)

After running the above code, the “data.json” file will be updated with the new age for the user with id 1.

Conclusion

Updating the data in a JSON file using Kivy is a simple process that involves loading the data, making the necessary changes, and saving the updated data back to the file. By following the CRUD method, we can easily manipulate JSON data in our Kivy applications.

Stay tuned for the next part of this tutorial, where we will explore more advanced techniques for working with JSON data in Kivy!