In this tutorial, we're gonna build a Spring Boot Thymeleaf CRUD example with Maven that use Spring Data JPA to interact with H2/MySQL/PostgreSQL database. You'll know:

How to configure Spring Data, JPA, Hibernate to work with Database
How to define Data Entity and Repository interfaces
Way to create Spring Controller to process HTTP requests
Way to use Spring Data JPA to interact with H2/MySQL/PostgreSQL Database
How to use Thymeleaf template engine for View layer

Full Article: Spring Boot Thymeleaf CRUD example

More Practice: Spring Boot Thymeleaf Pagination example

Overview of Spring Boot Thymeleaf example

We will build a Spring Boot CRUD example using Thymeleaf template engine for View layer and Spring Data JPA with Database in that:

Each Course (entity) has id, name, description, price, enabled status.
CRUD operations are supported: create, retrieve, update, delete Courses.
User can search Courses by name.

- Create new entity object:

- Retrieve all objects:

- Update status of an item:

- Update an object in its own page:

- Search by name:

- Delete an item:

Technology

Java 8
Spring Boot 2.7 (with Spring Web MVC, Spring Data JPA, Thymeleaf)
H2/MySQL/PostgreSQL Database
Maven 3.6.1
Bootstrap 4
jQuery 3.6.1
Font Awesome

Project Structure

Let me explain it briefly.

Course class corresponds to entity and table courses.
CourseRepository is an interface that extends JpaRepository for CRUD methods and custom finder methods. It will be autowired in CourseController.
CourseController is a Controller which has request mapping methods for RESTful requests such as: getAll, addCourse, saveCourse, editCourse, deleteCourse, updateCourseEnabledStatus.
static/css contains custom css style.
template stores HTML template files for the project.
Configuration for Spring Datasource, JPA & Hibernate in application.properties.
pom.xml contains dependencies for Spring Boot, Thymeleaf, Bootstrap and Database.

For more steps and Github source code, please visit:
Spring Boot Thymeleaf CRUD example

More Practice: Spring Boot Thymeleaf Pagination example

Spring Boot Thymeleaf CRUD example

Overview of Spring Boot Thymeleaf example

Technology

Project Structure

Further Reading