Hibernate 기본 용법

// @Entity                 bean(      POJO      )
// @Id           bean        （        key）
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
// @Table(name="")
//                Table
//       Table  ，   @Table(name="")
// ""        Table  
public class User {

private int id;
private String username;
private String password;

@Id
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
}

    // 1.     
    Query q = session.createQuery(" from User as u");

    // 2.     
    //Query q = session.createQuery(" from User as u where u.username = ?");
    //q.setParameter(0, "Jack");

    // 3.    SQL   
    //SQLQuery q = session.createSQLQuery("select * from user_info").addEntity(User.class);

    // 4.criteria   
/*  Criteria q = session.createCriteria(User.class);
    Criterion cc = Restrictions.between("id", 1, 3);
    Criterion cc1 = Restrictions.idEq(2);    
    q.add(cc);
    q.add(cc1);*/

     public class Test {

     public static void main(String[] args) {

    Configuration cfg = new Configuration().configure();
      @SuppressWarnings("deprecation")
    SessionFactory sf = cfg.buildSessionFactory();
    Session session = sf.openSession();
    session.beginTransaction();

    //       
    Set courses = new HashSet();
    Course c1 = new Course();
    c1.setCou_name("Chinese");
    Course c2 = new Course();
    c2.setCou_name("English");
    Course c3 = new Course();
    c3.setCou_name("Math");
    courses.add(c1);
    courses.add(c2);
    courses.add(c3);

    //       
    Set students = new HashSet();
    Student s1 = new Student();
    s1.setStu_name("Michael");
    Student s2 = new Student();
    s2.setStu_name("KangKang");
    Student s3 = new Student();
    s3.setStu_name("Jane");
    students.add(s1);
    students.add(s2);
    students.add(s3);

    //                
    c1.setStudents(students);
    c2.setStudents(students);
    c3.setStudents(students);

    //       
    session.save(c1);
    session.save(c2);
    session.save(c3);

    session.getTransaction().commit();
    session.close();
    sf.close();
    }
  }