Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.

Get started modeling entities and relationships for Java data persistence, using an example application based on Java 21 with Hibernate 6.3.

In this second half of the Java persistence with JPA and Hibernate tutorial, we move past concepts and start writing code that persists data to and from a relational database using JPA with Hibernate.