IndexedDB is a powerful client-side database API that allows web applications to store and retrieve structured data. Over time, you may find the need to upgrade your database schema to accommodate new features or changes in your application. In this blog post, we will explore the process of upgrading a database in IndexedDB.

Why Upgrade a Database?

Database upgrades are necessary when you need to add or modify object stores, indexes, or data structures in your IndexedDB database. This could be due to adding new features, fixing bugs, or making improvements to your application.

Steps to Upgrade a Database

1. Open the Database

The first step is to open the existing database using the open() method of the indexedDB object. You can specify the desired version number when opening the database. If the version is higher than the current version, the upgradeneeded event will be triggered.

const request = indexedDB.open("myDatabase", 2);

request.onupgradeneeded = function(event) {
  const db = event.target.result;
  // Upgrade database schema here
};

2. Handle the Upgrade

Inside the upgradeneeded event handler, you can access the event.target.result to get the database instance. You can then make the necessary upgrades to the database schema by creating or modifying object stores and indexes.

request.onupgradeneeded = function(event) {
  const db = event.target.result;
  const objectStore = db.createObjectStore("users", { keyPath: "id" });
  objectStore.createIndex("name", "name", { unique: false });
};

3. Complete the Upgrade

Once you have made the required changes, the versionchange event will be triggered. You can listen to this event to perform any additional operations or cleanup tasks before the upgrade is completed.

request.onversionchange = function(event) {
  const db = event.target.result;
  // Perform cleanup tasks here
};

4. Close the Database Connection

After you have completed the upgrade and any additional tasks, make sure to close the database connection using the close() method.

db.close();

Conclusion

Upgrading a database in IndexedDB is an essential step when your application requires changes to its data schema. By following these steps and making the necessary modifications, you can ensure your IndexedDB database remains up to date with your application’s evolving requirements.

#WebDevelopment #IndexedDB