数据库中根据你的查询条件只会返回唯一结果，就可以用uniqueResult这个方法！否则就用list（）；其返回类型为Object

uniqueResult()方法通常是在业务方法查询语句中用到的，比如(UsersRoles)getSession().createQuery(“select ur from UsersRoles ur where ur.role.id = ? and ur.user.id = ?”) .setParameter(0, roleId) .setParameter(1, userId) .uniqueResult();这时通表示只（从数据库中只返回一条记录）返回一个对象。当不确定时用List（）方法

如果查询返回多个值用list()方法

1.publicvoidtestQuery(){

2.Configurationconfig=newConfiguration().configure();

3.SessionFactoryfactory=config.buildSessionFactory();//创建SessionFactory

4.Sessionsession=factory.openSession();//创建Session

5.session.beginTransaction();//开始事务

6.

7.Queryquery=session.createQuery(“fromStudent”);

8.Listlist=query.list();//用list方法返回多个值

9.//Listlist=session.createQuery(“fromStudent”).list();

10.for(inti=0;i<list.size();i++){

11.Studentstudent=(Student)list.get(i);

12.System.out.print(student.getId()+”“);

13.System.out.print(student.getName()+”“);

14.System.out.print(student.getSex()+”“);

15.System.out.print(student.getBirthday());

16.System.out.println();

17.}

18.

19.session.getTransaction().commit();//提交事务

20.session.close();//关闭Session

21.}

当确定返回的实例只有一个或者null时 用uniqueResult()方法

1.publicvoidtestQuery(){

2.Configurationconfig=newConfiguration().configure();

3.SessionFactoryfactory=config.buildSessionFactory();//创建SessionFactory

4.Sessionsession=factory.openSession();//创建Session

5.session.beginTransaction();//开始事务

6.

7.Queryquery=session.createQuery(“fromStudent”);

8.Listlist=query.list();//用list方法返回多个值

9.//Listlist=session.createQuery(“fromStudent”).list();

10.for(inti=0;i<list.size();i++){

11.Studentstudent=(Student)list.get(i);

12.System.out.print(student.getId()+”“);

13.System.out.print(student.getName()+”“);

14.System.out.print(student.getSex()+”“);

15.System.out.print(student.getBirthday());

16.System.out.println();

17.}

18.

19.session.getTransaction().commit();//提交事务

20.session.close();//关闭Session

21.}

当确定返回的实例只有一个或者null时 用uniqueResult()方法

publicvoidtestGet(){

Configurationconfig=newConfiguration().configure();

SessionFactoryfactory=config.buildSessionFactory();

Sessionsession=factory.openSession();

session.beginTransaction();

Queryquery=session.createQuery(“fromStudentswheres.id=?”);

query.setString(0,“2”);

Studentstudent=(Student)query.uniqueResult();//当确定返回的实例只有一个或者null时用uniqueResult()方法

//Studentstudent=(Student)session.createQuery(“fromStudentswheres.id=?”).setString(0,”5″).uniqueResult();

System.out.println(student.getName());

System.out.println(student.getBirthday());

session.getTransaction().commit();

session.close();

}