How to use @OneToOne annotation in Spring Boot || Shyam Sundar
In Spring Boot with JPA (Java Persistence API), a one-to-one mapping is used when one entity is associated with exactly one other entity. You can achieve this using annotations like @OneToOne, @JoinColumn, and @MappedBy.
Let's assume we have two entities:
User (a user can have only one profile)
UserProfile (each profile belongs to only one user)
Key Points
Use @OneToOne for one-to-one relationships.
The owning entity (in this case, User) contains the @JoinColumn.
Use mappedBy in the non-owning entity to establish bidirectional mapping.
Cascade operations (CascadeType.ALL) can be used to propagate actions.
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