Student.java Source code

Introduction

Here is the source code for Student.java

Source

    File:Student.java

    import javax.persistence.CascadeType;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.ManyToOne;

@Entity
public class Student {
  @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
  private int id;
  private String name;

  @ManyToOne (cascade=CascadeType.ALL)
  private Department department;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }



  public Department getDepartment() {
    return department;
  }

  public void setDepartment(Department department) {
    this.department = department;
  }

  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n" + department;
  }
}

    File:Department.java

    import java.util.Set;

    import javax.persistence.CascadeType;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.OneToMany;

@Entity
public class Department {
    @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
    private int id;
    private String name;

    @OneToMany(mappedBy="department",cascade=CascadeType.ALL)
    private Set<Student> students;
    
    public int getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String deptName) {
        this.name = deptName;
    }

    public Set<Student> getStudents() {
      return students;
    }

    public void setStudent(Set<Student> students) {
      this.students = students;
    }

    public String toString() {
        return "Department id: " + getId() + 
               ", name: " + getName()+"Student:"+ students;
    }
}

    File:Main.java

    import java.util.List;

    import javax.persistence.EntityManager;
    import javax.persistence.EntityManagerFactory;
    import javax.persistence.Persistence;
    import javax.persistence.Query;

public class Main {
  static EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPAService");
  static EntityManager em = emf.createEntityManager();

  public static void main(String[] a) throws Exception {
    em.getTransaction().begin();
    
    
    Student student = new Student();
    student.setName("Joe");
    em.persist(student);
    
    Student student1 = new Student();
    student1.setName("Joe");
    em.persist(student1);
    
    Department dept = new Department();
    dept.setName("dept name");
    student.setDepartment(dept);
    student1.setDepartment(dept);
    
    em.flush();
    


    
    
    
    Query query = em.createQuery("SELECT e FROM Student e");
    List<Student> list = (List<Student>) query.getResultList();
    System.out.println(list.get(0).getDepartment());
    
    query = em.createQuery("SELECT d FROM Department d");
    List<Department> dList = (List<Department>) query.getResultList();
    System.out.println(dList.get(0).getStudents());
    
    em.getTransaction().commit();
    em.close();
    emf.close();
    
    Helper.checkData();
  }
}

    File:Helper.java

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.ResultSetMetaData;
    import java.sql.Statement;

    public class Helper {
        public static void checkData() throws Exception {
            Class.forName("org.hsqldb.jdbcDriver");
            Connection conn = DriverManager.getConnection("jdbc:hsqldb:data/tutorial", "sa", "");
            Statement st = conn.createStatement();

            ResultSet mrs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" });
            while (mrs.next()) {
                String tableName = mrs.getString(3);
                System.out.println("\n\n\n\nTable Name: " + tableName);

                ResultSet rs = st.executeQuery("select * from " + tableName);
                ResultSetMetaData metadata = rs.getMetaData();
                while (rs.next()) {
                    System.out.println(" Row:");
                    for (int i = 0; i < metadata.getColumnCount(); i++) {
                        System.out.println("    Column Name: " + metadata.getColumnLabel(i + 1) + ",  ");
                        System.out.println("    Column Type: " + metadata.getColumnTypeName(i + 1) + ":  ");
                        Object value = rs.getObject(i + 1);
                        System.out.println("    Column Value: " + value + "\n");
                    }
                }
            }
        }
    }

    File:persistence.xml

    <persistence xmlns="http://java.sun.com/xml/ns/persistence"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence"version="1.0"><persistence-unit name="JPAService"transaction-type="RESOURCE_LOCAL"><properties><property name="hibernate.dialect"value="org.hibernate.dialect.HSQLDialect"/><property name="hibernate.hbm2ddl.auto"value="update"/><property name="hibernate.connection.driver_class"value="org.hsqldb.jdbcDriver"/><property name="hibernate.connection.username"value="sa"/><property name="hibernate.connection.password"value=""/><property name="hibernate.connection.url"value="jdbc:hsqldb:data/tutorial"/></properties></persistence-unit></persistence>