SpringBoot basic application for test different data repository implementations to save data in H2:

• JDBC Repository: Implementation with SQL explicit queries to write and read data.
• JPA Repository: Using EntityManager to manage the methods to write and read data.
• Spring Data JPA: Using an interface that extends from JpaRepository to test default and some minor customs functions to read and write data.

The project has a simple COURSE class corresponding to the following table structure with the following structure:

create table course( id bigint not null, name varchar(255) not null, author varchar(255) not null, primary key (id));

The data can be read in the LOGs of the console:

As well as can be accessed via the H2 Local Console:

http://localhost:8080/h2-console

(No credentials needed, just clic connect to access the H2 console)