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Commit 3b4a927

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author
Rajeev Kumar Singh
committed
New Example
1 parent fe1b2ad commit 3b4a927

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7 files changed

+214
-180
lines changed

7 files changed

+214
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Lines changed: 31 additions & 18 deletions
Original file line numberDiff line numberDiff line change
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package com.example.hibernate;
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import com.example.hibernate.model.Course;
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import com.example.hibernate.model.Student;
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import com.example.hibernate.repository.CourseRepository;
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import com.example.hibernate.repository.StudentRepository;
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import com.example.hibernate.model.Post;
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import com.example.hibernate.model.Tag;
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import com.example.hibernate.repository.PostRepository;
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import com.example.hibernate.repository.TagRepository;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.CommandLineRunner;
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import org.springframework.boot.SpringApplication;
@@ -15,31 +15,44 @@
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public class HibernateManyToManyDemoApplication implements CommandLineRunner {
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@Autowired
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private StudentRepositorystudentRepository;
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private TagRepositorytagRepository;
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@Autowired
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private CourseRepositorycourseRepository;
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private PostRepositorypostRepository;
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public static void main(String[] args) {
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SpringApplication.run(HibernateManyToManyDemoApplication.class, args);
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}
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@Override
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public void run(String... args) throws Exception {
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studentRepository.deleteAllInBatch();
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courseRepository.deleteAllInBatch();
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// Cleanup the tables
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postRepository.deleteAllInBatch();
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tagRepository.deleteAllInBatch();
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// Create a Student
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Student student = studentRepository.save(new Student("Rajeev Kumar Singh", "rajeev@callicoder.com"));
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// =======================================
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// Create a Course
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Calendar courseStartDate = Calendar.getInstance();
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Calendar courseEndDate = Calendar.getInstance();
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courseEndDate.add(Calendar.MONTH, 6);
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Course course = courseRepository.save(new Course("Algorithms 101", courseStartDate.getTime(), courseEndDate.getTime()));
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// Create a Post
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Post post = new Post("Hibernate Many to Many Example with Spring Boot",
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"Learn how to map a many to many relationship using hibernate",
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"Entire Post content with Sample code");
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// Create two tags
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Tag tag1 = new Tag("Spring Boot");
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Tag tag2 = new Tag("Hibernate");
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// Add tag references in the post
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post.getTags().add(tag1);
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post.getTags().add(tag2);
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// Add post reference in the tags
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tag1.getPosts().add(post);
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tag2.getPosts().add(post);
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postRepository.save(post);
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// =======================================
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// Enrol the Student in the Course
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student.getCourses().add(course);
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studentRepository.save(student);
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}
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}

‎hibernate-many-to-many-demo/src/main/java/com/example/hibernate/model/Course.java‎

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package com.example.hibernate.model;
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import javax.persistence.*;
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import javax.validation.constraints.NotNull;
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import javax.validation.constraints.Size;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* Created by rajeevkumarsingh on 23/11/17.
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*/
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@Entity
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@Table(name = "posts")
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public class Post {
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@Id
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@GeneratedValue(strategy = GenerationType.AUTO)
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private Long id;
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@NotNull
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@Size(max = 100)
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private String title;
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@NotNull
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@Size(max = 250)
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private String description;
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@NotNull
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@Lob
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private String content;
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@NotNull
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@Temporal(TemporalType.TIMESTAMP)
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private Date postedAt = new Date();
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@NotNull
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@Temporal(TemporalType.TIMESTAMP)
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private Date lastUpdatedAt = new Date();
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@ManyToMany(fetch = FetchType.LAZY,
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cascade = {
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CascadeType.PERSIST,
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CascadeType.MERGE
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})
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@JoinTable(name = "post_tags",
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joinColumns = { @JoinColumn(name = "post_id") },
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inverseJoinColumns = { @JoinColumn(name = "tag_id") })
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private Set<Tag> tags = new HashSet<>();
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public Post() {
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}
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public Post(String title, String description, String content) {
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this.title = title;
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this.description = description;
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this.content = content;
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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 void setId(Long id) {
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this.id = id;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public String getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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public String getContent() {
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return content;
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}
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public void setContent(String content) {
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this.content = content;
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}
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public Date getPostedAt() {
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return postedAt;
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}
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public void setPostedAt(Date postedAt) {
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this.postedAt = postedAt;
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}
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public Date getLastUpdatedAt() {
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return lastUpdatedAt;
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}
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public void setLastUpdatedAt(Date lastUpdatedAt) {
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this.lastUpdatedAt = lastUpdatedAt;
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}
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public Set<Tag> getTags() {
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return tags;
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}
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public void setTags(Set<Tag> tags) {
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this.tags = tags;
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}
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}

‎hibernate-many-to-many-demo/src/main/java/com/example/hibernate/model/Student.java‎

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