In its default configuration, Petclinic uses an in-memory database (H2) which
gets populated at startup with data. The h2 console is automatically exposed at http://localhost:8080/h2-console
and it is possible to inspect the content of the database using the jdbc:h2:mem:testdb url.
A similar setup is provided for MySql in case a persistent database configuration is needed. Note that whenever the database type is changed, the app needs to be run with a different profile: spring.profiles.active=mysql for MySql.