Many-To-Many relationship using spring boot - Beginners

1)PFB the link reference for basic spring boot projects and concepts,

2)In a many-to-many relationship, many record in a parent table can be associated with many records in child table.
2.1)@ManyToMany annotation automatically creates the 3rd table and stores the primary and foreign key combinations over there.
Parent Table:
Child Table:
3rd Table:

3)Let we see the difference between One-To-Many and Many-To-Many from database perspective,


4)PFB the Many-To-Many from code perspective,
4.1)This base entity is an abstract class and it only contains common parameters for all tables.
4.2)EmpModel class denoted here as parent model class
4.3)EmpEduModel class denoted has child model class

5)This project explains below using Spring Boot, Restful-web-service and JPA,
  • Save or update using many to many mapping.
  • Multiple data Save or update using many to many mapping.
  • Fetching all data from 2 tables using many to many mapping.
  • Fetching multiple data from 2 tables using many to many mapping.
6)Use the below link to download the source code,


Context page: Click here
Home page: Click here

Thanks, I hope you enjoyed this session !!!.
-Somasundar Kanakaraj