The first thing you need to do is enable replication in MySQL. Save your app id, key, secret and cluster values. This will give you some sample code to get started: Then, go to your dashboard and create a Channels app, choosing a name, the cluster closest to your location, and optionally, React as the frontend tech and Java as the backend tech: If you haven’t already, create a free account at Pusher. Let’s start by creating a Pusher application. Here’s the diagram that describes the above process:įor reference, here is a GitHub repository with all the code shown in this tutorial and instructions to run it.
Then, we’ll parse the event to extract the relevant data and publish it to a Pusher channel so it can be consumed by a React application. We’ll read the database changes from the MySQL replication log using the library mysql-binlog-connector-java. It doesn’t waste resources (like polling) or hurt performance (like triggers). I’m going to use the third approach because I think is the most robust. Use the database transaction/replication log, which records every change to the database.Use database or application-level triggers to execute a piece of code when something changes.Poll the database every X seconds and determine if something has changed using a timestamp, version number or status field.If you want to track and determine if something in a database has changed, you have three main approaches: Optionally, a Java IDE and a JavaScript editor.MySQL Community Server 5.7 (5.6 and 5.5 should also work, but MySQL 8.0 is not yet supported).Here’s what you need to have installed to follow this tutorial: In this tutorial, you’re going to learn how to stream, in realtime, the changes made to a table in a MySQL database to a React app. In this context, change data capture is the approach you use to capture and deliver the changes in the database to other sources. If your application has a database, probably you’ll need its data in other places as soon as it goes in. You will need the Java JDK, Maven, MySQL and Node.js installed on your machine.Īpplications are more complex than ever before.Īnd it’s not only about the increasing number of users that must be handled or reducing response times. To follow this tutorial you will need some knowledge of Java programming and MySQL management tasks.
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