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Commit 81654b2

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author
Rajeev Kumar Singh
committed
Many-to-Many Demo
1 parent ee4d5b3 commit 81654b2

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6 files changed

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6 files changed

+233
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package com.example.hibernatemanytomanydemo;
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import com.example.hibernatemanytomanydemo.model.Course;
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import com.example.hibernatemanytomanydemo.model.Student;
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import com.example.hibernatemanytomanydemo.repository.CourseRepository;
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import com.example.hibernatemanytomanydemo.repository.StudentRepository;
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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;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import java.util.Calendar;
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@SpringBootApplication
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public class HibernateManyToManyDemoApplication {
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public class HibernateManyToManyDemoApplication implements CommandLineRunner {
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@Autowired
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private StudentRepository studentRepository;
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@Autowired
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private CourseRepository courseRepository;
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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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// Create a Student
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Student student = studentRepository.save(new Student("Rajeev Kumar Singh", "rajeev@callicoder.com"));
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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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// 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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}
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package com.example.hibernatemanytomanydemo.model;
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import javax.persistence.*;
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import javax.validation.constraints.NotNull;
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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 22/11/17.
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*/
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@Entity
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@Table(name = "courses")
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public class Course {
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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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private String name;
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@NotNull
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@Temporal(TemporalType.DATE)
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private Date startDate;
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@NotNull
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@Temporal(TemporalType.DATE)
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private Date endDate;
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@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "courses")
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private Set<Student> students = new HashSet<>();
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public Course() {
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}
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public Course(String name, Date startDate, Date endDate) {
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this.name = name;
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this.startDate = startDate;
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this.endDate = endDate;
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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 getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Date getStartDate() {
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return startDate;
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}
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public void setStartDate(Date startDate) {
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this.startDate = startDate;
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}
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public Date getEndDate() {
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return endDate;
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}
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public void setEndDate(Date endDate) {
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this.endDate = endDate;
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}
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public Set<Student> getStudents() {
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return students;
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}
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public void setStudents(Set<Student> students) {
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this.students = students;
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}
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}
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package com.example.hibernatemanytomanydemo.model;
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import org.hibernate.validator.constraints.Email;
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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.HashSet;
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import java.util.Set;
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/**
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* Created by rajeevkumarsingh on 22/11/17.
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*/
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@Entity
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@Table(name = "students")
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public class Student {
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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 name;
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@NotNull
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@Email
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@Size(max = 100)
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private String email;
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@ManyToMany
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@JoinTable(name = "enrolments",
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joinColumns = { @JoinColumn(name = "student_id") },
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inverseJoinColumns = { @JoinColumn(name = "course_id") })
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private Set<Course> courses = new HashSet<>();
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public Student() {
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}
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public Student(String name, String email) {
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this.name = name;
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this.email = email;
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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 getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getEmail() {
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return email;
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}
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public void setEmail(String email) {
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this.email = email;
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}
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public Set<Course> getCourses() {
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return courses;
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}
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public void setCourses(Set<Course> courses) {
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this.courses = courses;
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}
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}
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package com.example.hibernatemanytomanydemo.repository;
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import com.example.hibernatemanytomanydemo.model.Course;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.stereotype.Repository;
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/**
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* Created by rajeevkumarsingh on 22/11/17.
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*/
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@Repository
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public interface CourseRepository extends JpaRepository<Course, Long> {
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}
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package com.example.hibernatemanytomanydemo.repository;
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import com.example.hibernatemanytomanydemo.model.Student;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.stereotype.Repository;
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/**
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* Created by rajeevkumarsingh on 22/11/17.
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*/
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@Repository
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public interface StudentRepository extends JpaRepository<Student, Long> {
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}
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# DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
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spring.datasource.url=jdbc:mysql://localhost:3306/hibernate_many_to_many_demo?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false
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spring.datasource.username=root
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spring.datasource.password=root
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# Hibernate
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# The SQL dialect makes Hibernate generate better SQL for the chosen database
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spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
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# Hibernate ddl auto (create, create-drop, validate, update)
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spring.jpa.hibernate.ddl-auto = update
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logging.level.org.hibernate.SQL=DEBUG
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logging.level.org.hibernate.type=TRACE

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