Insert into Multiple tables using JPA #Query - spring-boot

Question

Insert JSON values into multiple tables using JPA and spring-boot.
User Table
#Entity
class User {
private #Id #GeneratedValue Long id;
private String name;
#OneToOne(cascade = {
CascadeType.All
})
#JoinColumn(referencedColumnName = "productid")
private Product product;
public User() {}
public User(String name, Product product) {
this.name = name;
this.product = product;
}
}
Product Table
#Entity
class Product {
private #Id #GeneratedValue Long productid;
private String productName;
public Product() {}
public Product(String productName) {
this.productName = productName;
}
}
Repository
#Repository
public interface UserRepo extends JpaRepository < User, Long > {}
Json Input
{
"name": "John",
"product": {
"productName": "Product 1"
}
}
Rest Controller
UserRepo usrRepo;
#PostMapping("/user")
User addEmployee(#RequestBody User user) {
return usrRepo.save(user);
}
When I use the above, both User and Product tables get updated with the new values from JSON. But I want to have the same functionality using #Query. Using the below code, I can update one table but not both.
Help me to insert JSON values into multiple tables using #Query. I am using cockroach db, please suggest if there is any other way to achieve this instead of spring-data-JPA.
Query
#Modifying
#Transactional
#Query(value = "insert into user (name, productid) values (:#{#user.name}, :#{#user.productid})", nativeQuery = true)
void insert(#Param("user) User user);