OpenShift for Developers, 2nd Edition

Chapter 7. Evolving the Application: Data Persistence

As you saw in the preceding chapter, the current deployment of the quarkus-backend only stores the list of posts in memory. Keeping lists in memory is excellent for performance, but all the posts will be lost each time the app restarts. Now, imagine if your bank lost your account information each time it decided to add a new feature or fix an issue. You’d probably be first in line at a new bank.

State is a critical aspect of many applications, and databases are one way to handle the information your application needs to keep, such as tracking your bank account’s ledger or maintaining the list of notes when the quarkus-backend restarts. In this chapter, you will deploy a PostgreSQL database and bind the Noted app to it to store the posts.

Database Without Delay

If you read the subtitle of the book, you know you’re supposed to be impatient. To spare you some waiting, your forked version of the quarkus-backend component already has a Git branch called pgsql with wiring in place to connect to a database. Check it out by opening a browser window to https://github.com/<your-name>/quarkus-backend/tree/pgsql (see Figure 7-1).

Figure 7-1. GitHub quarkus-backend pgsql branch

Database Templates

First you need to deploy a database for the pgsql branch to connect to. OpenShift makes it easy to deploy a database for development using ...