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eric-martineric-martin
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Merge pull request eugenp#5607 from fanatixan/bael-2190
bael-2190
2 parents 06bb965 + d2a4341 commit 2c5f92e

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‎persistence-modules/spring-jpa/src/main/java/com/baeldung/manytomany/model/Course.java‎

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package com.baeldung.manytomany.model;
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import java.util.Set;
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import javax.persistence.Column;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import javax.persistence.ManyToMany;
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import javax.persistence.OneToMany;
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import javax.persistence.Table;
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@Entity
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@Table(name = "course")
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public class Course {
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@Id
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@Column(name = "id")
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private Long id;
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@ManyToMany(mappedBy = "likedCourses")
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private Set<Student> likes;
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@OneToMany(mappedBy = "course")
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private Set<CourseRating> ratings;
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@OneToMany(mappedBy = "course")
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private Set<CourseRegistration> registrations;
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// additional properties
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public Course() {
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}
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public Long getId() {
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return id;
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}
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public Set<CourseRating> getRatings() {
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return ratings;
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}
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public Set<CourseRegistration> getRegistrations() {
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return registrations;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((id == null) ? 0 : id.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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Course other = (Course) obj;
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if (id == null) {
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if (other.id != null)
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return false;
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} else if (!id.equals(other.id))
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return false;
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return true;
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}
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}

‎persistence-modules/spring-jpa/src/main/java/com/baeldung/manytomany/model/CourseRating.java‎

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package com.baeldung.manytomany.model;
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import javax.persistence.Column;
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import javax.persistence.EmbeddedId;
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import javax.persistence.Entity;
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import javax.persistence.JoinColumn;
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import javax.persistence.ManyToOne;
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import javax.persistence.MapsId;
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import javax.persistence.Table;
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@Entity
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@Table(name = "course_rating")
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public class CourseRating {
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@EmbeddedId
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private CourseRatingKey id;
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@ManyToOne
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@MapsId("student_id")
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@JoinColumn(name = "student_id")
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private Student student;
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@ManyToOne
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@MapsId("course_id")
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@JoinColumn(name = "course_id")
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private Course course;
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@Column(name = "rating")
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private int rating;
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public CourseRating() {
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}
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public int getRating() {
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return rating;
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}
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public void setRating(int rating) {
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this.rating = rating;
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}
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public CourseRatingKey getId() {
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return id;
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}
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public Student getStudent() {
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return student;
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}
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public Course getCourse() {
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return course;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((id == null) ? 0 : id.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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CourseRating other = (CourseRating) obj;
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if (id == null) {
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if (other.id != null)
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return false;
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} else if (!id.equals(other.id))
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return false;
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return true;
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}
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}

‎persistence-modules/spring-jpa/src/main/java/com/baeldung/manytomany/model/CourseRatingKey.java‎

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package com.baeldung.manytomany.model;
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import java.io.Serializable;
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import javax.persistence.Column;
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import javax.persistence.Embeddable;
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@Embeddable
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public class CourseRatingKey implements Serializable {
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@Column(name = "student_id")
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private Long studentId;
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@Column(name = "course_id")
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private Long courseId;
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public CourseRatingKey() {
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}
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public Long getStudentId() {
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return studentId;
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}
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public Long getCourseId() {
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return courseId;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((courseId == null) ? 0 : courseId.hashCode());
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result = prime * result + ((studentId == null) ? 0 : studentId.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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CourseRatingKey other = (CourseRatingKey) obj;
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if (courseId == null) {
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if (other.courseId != null)
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return false;
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} else if (!courseId.equals(other.courseId))
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return false;
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if (studentId == null) {
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if (other.studentId != null)
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return false;
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} else if (!studentId.equals(other.studentId))
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return false;
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return true;
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}
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}

‎persistence-modules/spring-jpa/src/main/java/com/baeldung/manytomany/model/CourseRegistration.java‎

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package com.baeldung.manytomany.model;
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import java.time.LocalDateTime;
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import javax.persistence.Column;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import javax.persistence.JoinColumn;
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import javax.persistence.ManyToOne;
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import javax.persistence.Table;
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@Entity
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@Table(name = "course_registration")
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public class CourseRegistration {
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@Id
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@Column(name = "id")
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private Long id;
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@ManyToOne
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@JoinColumn(name = "student_id")
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private Student student;
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@ManyToOne
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@JoinColumn(name = "course_id")
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private Course course;
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@Column(name = "registered_at")
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private LocalDateTime registeredAt;
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@Column(name = "grade")
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private int grade;
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// additional properties
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public CourseRegistration() {
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}
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public Student getStudent() {
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return student;
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}
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public void setStudent(Student student) {
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this.student = student;
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}
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public Course getCourse() {
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return course;
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}
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public void setCourse(Course course) {
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this.course = course;
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}
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public LocalDateTime getRegisteredAt() {
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return registeredAt;
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}
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public void setRegisteredAt(LocalDateTime registeredAt) {
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this.registeredAt = registeredAt;
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}
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public int getGrade() {
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return grade;
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}
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public void setGrade(int grade) {
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this.grade = grade;
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}
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public Long getId() {
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return id;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((id == null) ? 0 : id.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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CourseRegistration other = (CourseRegistration) obj;
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if (id == null) {
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if (other.id != null)
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return false;
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} else if (!id.equals(other.id))
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return false;
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return true;
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}
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}

‎persistence-modules/spring-jpa/src/main/java/com/baeldung/manytomany/model/Student.java‎

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package com.baeldung.manytomany.model;
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import java.util.Set;
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import javax.persistence.Column;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import javax.persistence.JoinColumn;
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import javax.persistence.JoinTable;
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import javax.persistence.ManyToMany;
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import javax.persistence.OneToMany;
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import javax.persistence.Table;
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@Entity
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@Table(name = "student")
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public class Student {
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@Id
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@Column(name = "id")
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private Long id;
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@ManyToMany
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@JoinTable(name = "course_like", joinColumns = @JoinColumn(name = "student_id"), inverseJoinColumns = @JoinColumn(name = "course_id"))
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private Set<Course> likedCourses;
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@OneToMany(mappedBy = "student")
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private Set<CourseRating> ratings;
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@OneToMany(mappedBy = "student")
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private Set<CourseRegistration> registrations;
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// additional properties
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public Student() {
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}
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public Long getId() {
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return id;
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}
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public Set<Course> getLikedCourses() {
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return likedCourses;
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}
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public Set<CourseRating> getRatings() {
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return ratings;
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}
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public Set<CourseRegistration> getRegistrations() {
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return registrations;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((id == null) ? 0 : id.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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Student other = (Student) obj;
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if (id == null) {
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if (other.id != null)
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return false;
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} else if (!id.equals(other.id))
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return false;
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return true;
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}
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}

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