
What is mapping in Hibernate , How to expalin to Interviewer
Excellent follow-up! Here's a comprehensive guide to explain Hibernate Mapping using your Hotel Management System project. This is a critical topic for 3+ years experienced developers. The Opening Pitch "Hibernate mapping is how we tell Hibernate to connect our Java objects (entities) to database tables. In my Hotel Management System, I used various mapping strategies to model real-world relationships between guests, rooms, bookings, and payments." The 4 Types of Mappings (With Hotel Examples) 1. Entity Mapping ( @entity , @Table, @id ) Basic mapping of a Java class to a database table. In my Hotel System: @Entity @Table ( name = "guests" ) public class Guest { @Id @GeneratedValue ( strategy = GenerationType . IDENTITY ) @Column ( name = "guest_id" ) private Long id ; @Column ( name = "full_name" , nullable = false , length = 100 ) private String name ; @Column ( unique = true ) // Email must be unique private String email ; @Transient // This won't be stored in database private int ag
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