This app will give you real applications in the use Spring Boot

You will see the full source code of the demo. You will see how:

1. Spring Data JPA:
a. Get Entities List from Database with Spring Data JPA in Spring Boot
b. Find Entity by Primary Key with Spring Data JPA in Spring Boot
c. Use Custom Query with Spring Data JPA in Spring Boot
d. Create Entity with Spring Data JPA in Spring Boot
e. Update Entity with Spring Data JPA in Spring Boot
f. Delete Entity with Spring Data JPA in Spring Boot

2. Hibernate:
a. Get Entities List from Database with Hibernate in Spring Boot
b. Find Entity by Primary Key with Hibernate in Spring Boot
c. Create Entity with Hibernate in Spring Boot
d. Update Entity with Hibernate in Spring Boot
e. Delete Entity with Hibernate in Spring Boot

3. Spring JDBC:
a. Get Entities List from Database with Spring JDBC in Spring Boot
b. Find Entity by Primary Key with Spring JDBC in Spring Boot
c. Create Entity with Spring JDBC in Spring Boot
d. Update Entity with Spring JDBC in Spring Boot
e. Delete Entity with Spring JDBC in Spring Boot

4. Spring Data MongoDB:
a. Get Entities List from Database with Spring Data MongoDB in Spring Boot
b. Find Entity by Primary Key with Spring Data MongoDB in Spring Boot
c. Use Custom Query with Spring Data MongoDB in Spring Boot
d. Create Entity with Spring Data MongoDB in Spring Boot
e. Update Entity with Spring Data MongoDB in Spring Boot
f. Delete Entity with Spring Data MongoDB in Spring Boot

5. Spring Rest API:
a. Use Text Plain in Spring Rest API in Spring Boot
b. Use Text HTML in Spring Rest API in Spring Boot
c. Use Parameters in Spring Rest API in Spring Boot
d. Convert Object to/from JSON in Spring Rest API in Spring Boot
e. Convert Objects List to/from JSON in Spring Rest API in Spring Boot

6. Spring MVC:
a. Pass Data from Controller to View in Spring MVC in Spring Boot
b. Use URL Parameters in Spring MVC in Spring Boot
c. Use Forms in Spring MVC in Spring Boot

You also see the results after the demo with the illustrations.

You can also copy the code in this app and use it on your project.