The reason for using the @OneToMany and @ManyToOne annotations is to tell JPA how to design the DB table.
Yes, the primary reason for using the @OneToMany and @ManyToOne annotations is to inform JPA how to design the database tables and how to map the relationships between entities. These annotations define the associations between entities in your object model and help JPA to generate the appropriate database schema and SQL statements for persisting, updating, and querying data.
When you use the @OneToMany annotation on a field in an entity, you're telling JPA that the entity has a one-to-many relationship with the target entity specified in the field. JPA will create a foreign key column in the target entity's table that refers to the primary key of the entity where the @OneToMany annotation is used.
Similarly, when you use the @ManyToOne annotation on a field in an entity, you're telling JPA that the entity has a many-to-one relationship with the target entity specified in the field. In this case, JPA will create a foreign key column in the entity's table that refers to the primary key of the target entity.
By using these annotations, you're providing JPA with the necessary information to create the correct database schema and manage the relationships between entities when performing CRUD (Create, Read, Update, Delete) operations.
