Hibernate Component Mapping Using Annotations Part -1

In this example you will learn how to map components using Hibernate Annotations. Consider the following relationship between Student and Address entity.

According to the relationship each student should have a unique address.

Since the Student and Address entities are strongly related (composition relation), it is better to store them in a single table. The relational model is shown below.

Student class is used to create the STUDENT table.

01.package com.vaannila.student;

02. 

03.import javax.persistence.Column;

04.import javax.persistence.Embedded;

05.import javax.persistence.Entity;

06.import javax.persistence.GeneratedValue;

07.import javax.persistence.Id;

08.import javax.persistence.Table;

09. 

10.@Entity

11.@Table(name = "STUDENT")

12.public class Student {

13. 

14.private long studentId;

15.private String studentName;

16.private Address studentAddress;

17. 

18.public Student() {

19.}

20. 

21.public Student(String studentName, Address studentAddress) {

22.this.studentName = studentName;

23.this.studentAddress = studentAddress;

24.}

25. 

26.@Id

27.@GeneratedValue

28.@Column(name = "STUDENT_ID")

29.public long getStudentId() {

30.return this.studentId;

31.}

32. 

33.public void setStudentId(long studentId) {

34.this.studentId = studentId;

35.}

36. 

37.@Column(name = "STUDENT_NAME", nullable = false, length = 100)

38.public String getStudentName() {

39.return this.studentName;

40.}

41. 

42.public void setStudentName(String studentName) {

43.this.studentName = studentName;

44.}

45. 

46.@Embedded

47.public Address getStudentAddress() {

48.return this.studentAddress;

49.}

50. 

51.public void setStudentAddress(Address studentAddress) {

52.this.studentAddress = studentAddress;

53.}

54. 

55.}

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