what is @JoinColumn and how it is used in Hibernate

Question

I have been reading a lot about @JoinColumn but I still don\'t get the idea behind it.

Patient Table

CREATE TABLE patient (
patient_id BIGINT NOT NUL         


        

Answer 1

The table in which join column will be found depends upon context.

• If the join is for a OneToOne or ManyToOne mapping using a foreign key mapping strategy, the foreign key column is in the table of the source entity or embeddable.

• If the join is for a unidirectional OneToMany mapping using a foreign key mapping strategy, the foreign key is in the table of the target entity.

• If the join is for a ManyToMany mapping or for a OneToOne or bidirectional ManyToOne/OneToMany mapping using a join table, the foreign key is in a join table.

• If the join is for an element collection, the foreign key is in a collection table.