package com.cwnu.entities; 
import javax.persistence.*; 
import java.io.Serializable; 
/** 
 * Created by yangy on 2015/12/19. 
 */ 
@Table(name = "student") 
@Entity 
public class StudentEntity implements Serializable{ 
 private int id; 
 private String name; 
 @Id 
 @Column(name = "id") 
 @GeneratedValue(strategy = GenerationType.AUTO) 
 private int getId() { 
  return id; 
 } 
 public void setId(int id) { 
  this.id = id; 
 } 
 @Column(name = "name") 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
} 

 @Test 
public void testGetOrLoad() { 
 Session session = sessionFactory.getCurrentSession(); 
 StudentEntity student = (StudentEntity)session.get(StudentEntity.class, 1); 
 //StudentEntity student_load = (StudentEntity)session.load(StudentEntity.class,1); String name = student.getName(); 
} 

@Test 
 public void testClear() { 
  Session session = sessionFactory.getCurrentSession(); 
  session.get(StudentEntity.class,1); 
  session.clear(); 
  session.get(StudentEntity.class,1); 
 } 

Session session = sessionFactory.openSession(); 
Transaction tx = session.beginTransaction();  
for ( int i=0; i<100000; i++ ) {  
Customer customer = new Customer(.....);  
session.save(customer);  
if ( i % 20 == 0 ) { 
//20, same as the JDBC batch size   
//flush a batch of inserts and release memory:   
session.flush();  
session.clear();  
}}  
tx.commit();session.close();