package com.mossle.core.hibernate;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import com.mossle.core.page.Page;
import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.CriteriaSpecification;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Projection;
import org.hibernate.internal.CriteriaImpl;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.Assert;
/**
* 提供分页查询功能.
*
* @author Lingo
*/
public class HibernatePagingDao extends HibernateGenericDao {
/** default constructor. */
public HibernatePagingDao() {
}
/**
* constructor.
*
* @param sessionFactory
* SessionFactory
*/
public HibernatePagingDao(SessionFactory sessionFactory) {
super(sessionFactory);
}
// ============================================================================================
// pagedQuery
// ============================================================================================
/**
* 分页查询函数，使用hql.
*
* @param hql
* HQL字符串
* @param pageNo
* 当前页号
* @param pageSize
* 每页最大记录数
* @param values
* 参数
* @return 分页结果
*/
@Transactional(readOnly = true)
public Page pagedQuery(String hql, int pageNo, int pageSize,
Object... values) {
Assert.hasText(hql);
Assert.isTrue(pageNo >= 1, "pageNo should be eg 1");
// Count查询
String countQueryString = "select count (*) "
+ HibernateUtils.removeSelect(HibernateUtils.removeOrders(hql));
Integer totalCount = this.getCount(countQueryString, values);
if (totalCount < 1) {
return new Page();
}
// 实际查询返回分页对象
Query query = createQuery(hql, values);
int start = (pageNo - 1) * pageSize;
List result = query.setFirstResult(start).setMaxResults(pageSize)
.list();
Page page = new Page(result, totalCount);
page.setPageNo(pageNo);
page.setPageSize(pageSize);
return page;
}
/**
* 分页查询函数，使用hql.
*
* @param hql
* HQL字符串
* @param pageNo
* 当前页号
* @param pageSize
* 每页最大记录数
* @param map
* Map
* @return 分页结果
*/
@Transactional(readOnly = true)
public Page pagedQuery(String hql, int pageNo, int pageSize,
Map<String, Object> map) {
Assert.hasText(hql);
Assert.isTrue(pageNo >= 1, "pageNo should be eg 1");
// Count查询
String countQueryString = "select count (*) "
+ HibernateUtils.removeSelect(HibernateUtils.removeOrders(hql));
Integer totalCount = this.getCount(countQueryString, map);
if (totalCount < 1) {
return new Page();
}
// 实际查询返回分页对象
Query query = createQuery(hql, map);
int start = (pageNo - 1) * pageSize;
List result = query.setFirstResult(start).setMaxResults(pageSize)
.list();
Page page = new Page(result, totalCount);
page.setPageNo(pageNo);
page.setPageSize(pageSize);
return page;
}
/**
* 分页查询函数，使用已设好查询条件与排序的<code>Criteria</code>.
*
* @param criteria
* 条件
* @param pageNo
* 当前页号
* @param pageSize
* 每页最大记录数
* @return 含总记录数和当前页数据的Page对象.
*/
@Transactional(readOnly = true)
public Page pagedQuery(Criteria criteria, int pageNo, int pageSize) {
Assert.notNull(criteria);
Assert.isTrue(pageNo >= 1, "pageNo should be eg 1");
Assert.isTrue(criteria instanceof CriteriaImpl);
// 先把Projection和OrderBy条件取出来,清空两者来执行Count操作
Projection projection = HibernateUtils.findProjection(criteria);
List orderEntries = HibernateUtils.findOrderEntries(criteria);
HibernateUtils.setOrderEntries(criteria, Collections.EMPTY_LIST);
// 执行查询
Integer totalCount = this.getCount(criteria);
// 将之前的Projection和OrderBy条件重新设回去
criteria.setProjection(projection);
if (projection == null) {
criteria.setResultTransformer(CriteriaSpecification.ROOT_ENTITY);
}
HibernateUtils.setOrderEntries(criteria, orderEntries);
// 返回分页对象
if (totalCount < 1) {
return new Page();
}
int start = (pageNo - 1) * pageSize;
List result = criteria.setFirstResult(start).setMaxResults(pageSize)
.list();
Page page = new Page(result, totalCount);
page.setPageNo(pageNo);
page.setPageSize(pageSize);
return page;
}
/**
* 分页查询函数，根据entityClass和查询条件参数创建默认的<code>Criteria</code>.
*
* @param <T>
* 实体类型
* @param entityClass
* 实体类型
* @param pageNo
* 当前页号
* @param pageSize
* 每页最大记录数
* @param criterions
* 条件
* @return 含总记录数和当前页数据的Page对象.
*/
@Transactional(readOnly = true)
public <T> Page pagedQuery(Class<T> entityClass, int pageNo, int pageSize,
Criterion... criterions) {
Criteria criteria = createCriteria(entityClass, criterions);
return pagedQuery(criteria, pageNo, pageSize);
}
/**
* 分页查询函数，根据entityClass和查询条件参数,排序参数创建默认的<code>Criteria</code>.
*
* @param <T>
* 实体类型
* @param entityClass
* 实体类型
* @param pageNo
* 当前页号
* @param pageSize
* 每页最大记录数
* @param orderBy
* 排序字段名
* @param isAsc
* 是否正序
* @param criterions
* 条件
* @return 含总记录数和当前页数据的Page对象.
*/
@Transactional(readOnly = true)
public <T> Page pagedQuery(Class<T> entityClass, int pageNo, int pageSize,
String orderBy, boolean isAsc, Criterion... criterions) {
Criteria criteria = createCriteria(entityClass, orderBy, isAsc,
criterions);
Page page = this.pagedQuery(criteria, pageNo, pageSize);
page.setOrderBy(orderBy);
page.setOrder(isAsc ? "ASC" : "DESC");
return page;
}
/**
* 分页查询函数，根据entityClass和page参数进行查询.
*
* @param <T>
* 实体类型
* @param entityClass
* 实体类型
* @param page
* 分页里包含的各种参数
* @return 含总记录数和当前页数据的Page对象.
*/
@Transactional(readOnly = true)
public <T> Page pagedQuery(Class<T> entityClass, Page page) {
String orderBy = page.getOrderBy();
String order = page.getOrder();
Criteria criteria = null;
if (page.isOrderEnabled()) {
criteria = createCriteria(entityClass, orderBy, "ASC".equals(order));
} else {
criteria = createCriteria(entityClass);
}
Page resultPage = this.pagedQuery(criteria, page.getPageNo(),
page.getPageSize());
resultPage.setOrderBy(orderBy);
resultPage.setOrder(order);
return resultPage;
}
/**
* 分页查询函数，根据entityClass和page参数进行查询.
*
* @param <T>
* 实体类型
* @param entityClass
* 实体类型
* @param page
* 分页里包含的各种参数
* @param criterions
* 条件
* @return 含总记录数和当前页数据的Page对象.
*/
@Transactional(readOnly = true)
public <T> Page pagedQuery(Class<T> entityClass, Page page,
Criterion... criterions) {
String orderBy = page.getOrderBy();
String order = page.getOrder();
Criteria criteria = null;
if (page.isOrderEnabled()) {
criteria = createCriteria(entityClass, orderBy,
"ASC".equals(order), criterions);
} else {
criteria = createCriteria(entityClass, criterions);
}
Page resultPage = this.pagedQuery(criteria, page.getPageNo(),
page.getPageSize());
resultPage.setOrderBy(orderBy);
resultPage.setOrder(order);
return resultPage;
}
}