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我有一个分页标准执行，它返回一个实体的行。实体类如下。DetachCriteria分页查询返回重复值
@Entity
@Table(name="POS_T_HTL_ITEM_GROUP")
public class HotelItemGroup extends Versioned {
private static final long serialVersionUID = 1734461562543376947L;
@Id
@SequenceGenerator(name = "s_hotel_item_group", sequenceName = "POS_S_HTL_ITEM_GROUP")
@GeneratedValue(strategy = GenerationType.AUTO, generator = "s_hotel_item_group")
@Column(name = "HTL_ITEM_GROUP_ID")
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "HOTEL_ID")
private Hotel hotel;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "ITM_GRP_ID")
private ItemGroup itemGroup;
@Transient
private String action;
/**
* @return the id
*/
public Long getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Long id) {
this.id = id;
}
/**
* @return the hotel
*/
public Hotel getHotel() {
return hotel;
}
/**
* @param hotel the hotel to set
*/
public void setHotel(Hotel hotel) {
this.hotel = hotel;
}
/**
* @return the itemGroup
*/
public ItemGroup getItemGroup() {
return itemGroup;
}
/**
* @param itemGroup the itemGroup to set
*/
public void setItemGroup(ItemGroup itemGroup) {
this.itemGroup = itemGroup;
}
/**
* @return the action
*/
public String getAction() {
return action;
}
/**
* @param action the action to set
*/
public void setAction(String action) {
this.action = action;
}
}
这是执行分离标准的dao实施方法，下面是方法实施。
@Override
public Page<HotelItemGroup> findHotelItemGroupsByCriteria(HotelItemGroupDTO searchCriteria,Page<HotelItemGroup> pg) {
DetachedCriteria dc = DetachedCriteria.forClass(HotelItemGroup.class);
dc.createAlias("hotel", "htl");
dc.createAlias("itemGroup", "itm");
dc.createAlias("itm.majorGroup", "majGrp");
dc.addOrder(Order.asc("majGrp.majorGroupName"));
if (searchCriteria.getHotelId() != null) {
dc.add(Restrictions.eq("htl.id", searchCriteria.getHotelId()));
}
if (searchCriteria.getMajorGroupId() != null) {
dc.add(Restrictions.eq("majGrp.id", searchCriteria.getMajorGroupId()));
}
if (searchCriteria.getItemGroupId() != null) {
dc.add(Restrictions.eq("itm.id", searchCriteria.getItemGroupId()));
}
return executeCriteria(dc, pg);
}
以下是executeCriteria方法的抽象方法实现。
@SuppressWarnings("unchecked")
@Transactional(readOnly = true)
public <R extends Serializable> Page<R> executeCriteria(final DetachedCriteria dc, final Page<R> page) {
return (Page<R>) getJpaTemplate().execute(new JpaCallback() {
@Override
public Object doInJpa(EntityManager em) throws PersistenceException {
// Obtain Hibernate Session from EM
Session session = PersistenceUtil.getSession(em);
// Find Total & Update Page
dc.setProjection(Projections.rowCount());
Criteria ctrTotal = dc.getExecutableCriteria(session);
page.setTotalRecords(((Number) ctrTotal.uniqueResult()).longValue());
// Reset Criteria
dc.setProjection(null);
dc.setResultTransformer(CriteriaSpecification.ROOT_ENTITY);
// Perform Search & Update Page
Criteria ctrQuery = dc.getExecutableCriteria(session);
ctrQuery.setFirstResult(page.getStartPosition());
if (page.getPageSize() > 0) {
ctrQuery.setMaxResults(page.getPageSize());
}
page.setPageData(ctrQuery.list());
return page;
}
});
}
问题是，我为每个查询分配15个对象的结果集。在初始加载时，我请求第一页，如果用户请求第二页，它将返回一组结果，其中包含第一页中存在重复记录的结果。我在这里做错了什么？ Page是基本由以下属性组成的类。
private long totalRecords = 0;
private int startPosition = 0;
private int pageSize = DEFAULT_PAGE_SIZE;
private Collection<T> pageData = null;
任何人都可以请帮我解决这个问题。