package com.lc.view;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.lc.domain.Student;
import com.lc.utils.HibernateUtil;
public class selectStudent {
 public static void main(String[] args) {
 selectSomeStudents();
 }
 /**
 * 1.检索所有的学生
 **/
 public static void selectAllStudents(){
 Session session = null;
 Transaction ts = null;
 try {
 session = HibernateUtil.getCurrentSession();
 ts = session.beginTransaction();
 List<Student> list = session.createQuery("from Student").list();
 //取出数据1.for循环增强
 for(Student stu:list){
 System.out.println(stu.getSid()+" "+ stu.getSname()+" "+stu.getSdept());
 }
 //取出数据2.迭代器
 System.out.println("------------------------------");
 Iterator iterator = list.iterator();
 while(iterator.hasNext()){
 Student s = (Student) iterator.next();
 System.out.println(s.getSid()+" "+ s.getSname()+" "+s.getSdept());
 }
 ts.commit();
 } catch (Exception e) {
 if (ts != null) {
 ts.rollback();
 }
 throw new RuntimeException(e.getMessage());
 } finally {
 if (session != null && session.isOpen()) {
 session.close();
 }
 }
 }
 /**
 * 2.检索部分的学生
 **/
 public static void selectSomeStudents(){
 Session session = null;
 Transaction ts = null;
 try {
 session = HibernateUtil.getCurrentSession();
 ts = session.beginTransaction();
 /**
 *不可以这样去除数据了 因为只有Student对象的两个属性值 不是一个对象 
 List<Student> list = session.createQuery("select sname,sdept from Student").list();
 for(Student stu:list){
 System.out.println(stu.getSname()+" "+stu.getSdept());
 }**/
 List list = session.createQuery("select sname,sdept from Student").list();
 for(int i=0;i<list.size();i++){
 Object[] obj = (Object[]) list.get(i);
 System.out.println(obj[0].toString()+" "+obj[1].toString());
 }
 ts.commit();
 } catch (Exception e) {
 if (ts != null) {
 ts.rollback();
 }
 throw new RuntimeException(e.getMessage());
 } finally {
 if (session != null && session.isOpen()) {
 session.close();
 }
 }
 }
}