Storage Options in Kivy - (Kivy Storage and Database)

Kivy offers various storage options to save data, images, and other files that are necessary for an application to function.

Storage Options

Some of the storage options available in Kivy are:

1. App Storage: This is used for storing data that an application needs during its lifetime. This data is persistent and allows an application to store data across multiple launches.

2. Cache Storage: This is used for storing data temporarily. It is used when an application needs to store data that can be recreated if lost. Cache storage can be cleared by the operating system at any time.

3. User Data Storage: This is used for storing data that is unique to a user. User data is stored in a directory that is specific to each user and cannot be accessed by other users.

4. Database Storage: This is used for storing structured data that can be accessed and manipulated. It uses the SQLite database engine and is designed to be simple to use.

Database Storage

SQLite is a lightweight database engine that is included in the Python standard library. It is well-suited for small to medium-sized applications that require a simple database engine. SQLite is used by Kivy for database storage.

Syntax

To access the database, we use the below syntax:

from kivy.storage.jsonstore import JsonStore
store = JsonStore('filename.json')

Here, we have imported the JsonStore class from the kivy.storage.jsonstore module and created an instance of the JsonStore class with the filename of the database file as an argument.

Example

from kivy.storage.jsonstore import JsonStore
store = JsonStore('example.json')

# Add data
store.put('person', name='John Doe', age='25')
store.put('person', name='Jane Doe', age='30')

# Get data
print(store.get('person')['name']) # Output: John Doe

# Delete data
store.delete('person', name='John Doe')

Output

John Doe

Explanation

In the above example, we have imported the JsonStore class from the kivy.storage.jsonstore module and created an instance of the JsonStore class with the filename example.json.

We have added two records with the put() method. The first record has the name John Doe and age 25, and the second record has the name Jane Doe and age 30.

We have retrieved the value of name for the record with the key person using the get() method and printed it to the console.

We have then used the delete() method to delete the record with name John Doe.

Use

Database storage can be used to store data that an application needs to access frequently or data that needs to be persisted across multiple launches of the application. It is useful for storing user settings, preferences, or other data that is specific to each user.

Important Points

• SQLite is used for database storage in Kivy.
• The JsonStore class is used to access the database.
• Data can be added, retrieved, and deleted from the database using the put(), get(), and delete() methods of the JsonStore class.
• Database storage is useful for storing user settings, preferences, or other data that is specific to each user.

Summary

Kivy offers various storage options, including app storage, cache storage, user data storage, and database storage. Database storage is suitable for storing structured data that can be accessed and manipulated. It is useful for storing user settings, preferences, or other data that is specific to each user. SQLite is the database engine used by Kivy for database storage, and the JsonStore class is used to access the database.