How to use Spring Boot CRUD API to insert data in multiple tables using one POST endpoint - spring-boot

Question

How can a data be inserted using single POST endpoint in multiple tables. For example there are two tables
1. Employee
2. Department
These two tables have a primary key and foreign key relationship.
How to achieve data insertion in two tables using a single POST endpoint ?

Answer 1

Ok I see what you want.... your entities have to look like this...
You have to create a one to one relationship something like this:
Department entity:
#Entity
#Table
#Data
public class Department {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private String description;
}
Employee entity:
#Entity
#Table
#Data
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private String email;
private String address;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "department_id", referencedColumnName = "id")
private Department department;
}
And than you can add Data on Startup like this:
#Component
public class DBSeeder implements CommandLineRunner {
#Autowired
private EmployeeRepository repository;
#Override
public void run(String... args) throws Exception {
Department dep1 = new Department();
dep1.setName("Demolition");
dep1.setDescription("Do demo");
Employee emp1 = new Employee();
emp1.setName("John Rambo");
emp1.setEmail("john.rambo#demolition.com");
emp1.setAddress("Demolition Av. 5");
emp1.setDepartment(dep1);
this.repository.save(emp1);
}
}

Answer 2

#Repository
public interface EmployeeRepository extends CrudRepository<Employee, Long> {
Employee save(Employee employee);
}
Do you also ask how the entity objects have to look like?