Hibernate分页+条件查询

分页工具类PageInfo

package cn.hibernate.util;  import java.util.List;  import javax.persistence.criteria.CriteriaBuilder.In;  /**  * @Description:部门实体类  * @author:20155805邝家豪  * @date 2018年4月2日上午9:25:00  */ public class PageInfo<T> { 	public static final int PAGESIZE=3; 	private Integer count;//总记录数 	private Integer pageIndex;//当前页号  	 	public Integer getCount() { 		return count; 	} 	public void setCount(Integer count) { 		this.count = count; 	} 	public Integer getPageIndex() { 		return pageIndex; 	} 	public void setPageIndex(Integer pageIndex) { 		this.pageIndex = pageIndex; 	} 	public Integer getTotalPages() { 		if (this.count%this.PAGESIZE==0) { 			this.totalPages=this.count/this.PAGESIZE; 		} else { 			this.totalPages=this.count/this.PAGESIZE+1;  		} 		return this.totalPages; 	} 	public List<T> getPageList() { 		return pageList; 	} 	public void setPageList(List<T> pageList) { 		this.pageList = pageList; 	} 	public Integer getPrameterPageIndex() { 		this.prameterPageIndex = pageIndex-1; 		return prameterPageIndex; 	} 	public Integer getNextPageIndex() { 		this.nextPageIndex = pageIndex+1; 		return nextPageIndex; 	}     	private Integer totalPages;//总页数 	private Integer prameterPageIndex;//上一页 	private Integer nextPageIndex;//下一页 	private List<T> pageList;//当前页的记录集合 	  } 

1、Dao层用到的方法

	//使用uniqueResult获取唯一结果,计算查询条件下的记录数 		public Long obtainCount(String hql, Dept conditions) { 			// 定义HQL语句 			String hql1 = "select count(deptNo)  " + hql; 			// 构建Query对象 			Query query = currentSession().createQuery(hql1); 			query.setProperties(conditions); 			// 执行查询 			return (Long) query.uniqueResult(); 		} 	 	//条件查询+分页 	public List<Dept> conditionFindByPage(String hql, Dept conditions,int pageNo,int pageSize) { 		// 定义HQL语句 		//String hql = "from House  order by id "; 		// 构建Query对象 		Query query = currentSession().createQuery(hql); 		query.setProperties(conditions); 		query.setFirstResult((pageNo-1)*pageSize);//设置获取结果的起始下标 		query.setMaxResults(pageSize);//设置最大返回结果数 		// 执行查询 		return query.list(); 	}

2、Service层用到的方法

//条件查询+分页【通用方法】 	public void findHouseByConditionsByPage(PageInfo<Dept> pageInfo, Dept conditions) { 		Transaction tx = null; 		List<Dept> result = null; 		try { 			tx = HibernateUtil.currentSession().beginTransaction(); 			//HQL根据条件动态生成 			StringBuilder hql=new StringBuilder("from Dept as dept where 1=1 "); 			//String类型属性 			if (conditions.getDeptName() != null && conditions.getDeptName().length() > 0) { 				hql.append(" and dept.deptName like '%"+conditions.getDeptName()+"%' "); 			} 			if (conditions.getLocation() != null && conditions.getLocation().length() > 0) { 				hql.append(" and dept.location like '%"+conditions.getLocation()+"%' "); 			} 			//int类型属性 			/*if (conditions.getFloorage() != 0 && conditions.getFloorage() > 0) { 				hql.append(" and house.floorage>=:floorage"); 			}*/ 			//float类型属性 			/*if (conditions.getPrice() != 0) { 				hql.append(" and house.price<=:price "); 			}*/ 			//Date类型属性 /*			if (conditions.getPubdate()!=null) { 				Calendar ca = Calendar.getInstance();// 得到一个Calendar的实例   				//ca.setTime(new Date()); // 设置时间为当前时间 				ca.setTime(conditions.getPubdate()); 				//ca.add(Calendar.YEAR, -1); // 年份减1   				ca.add(Calendar.MONTH, -1);// 月份减1   				//ca.add(Calendar.DATE, -1);// 日期减1   				Date resultDate = ca.getTime(); // 结果   				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  				System.out.println("最早日期转换结果"+sdf.format(resultDate));  				hql.append(" and house.pubdate >= '"+sdf.format(resultDate)+"'"); 			}*/ 			//获取总列数 			Long count=deptdao.obtainCount(hql.toString(), conditions); 			pageInfo.setCount(count.intValue()); 			 			pageInfo.setPageList(deptdao.conditionFindByPage(hql.toString(),conditions,pageInfo.getPageIndex(),pageInfo.PAGESIZE)); 			 			for (Dept dept : pageInfo.getPageList()) { 				System.out.println("部门："+dept.getDeptName()+"--位置："+dept.getLocation()); 			} 			tx.commit(); 		} catch (HibernateException e) { 			// TODO: handle exception 			e.printStackTrace(); 			if (tx != null) { 				tx.rollback(); 			} 		} 	}	

3、测试类

package test;  import static org.junit.Assert.*;  import java.util.ArrayList; import java.util.Date; import java.util.List;  import org.junit.Test;  import cn.hibernate.entity.Dept; import cn.hibernate.entity.Emp; import cn.hibernate.service.DeptService; import cn.hibernate.util.PageInfo;  public class DeptServiceTest {  	private DeptService deptservice = new DeptService(); 	 	private List<Dept> deptList = new ArrayList<Dept>(); 	private int index=1; 	PageInfo<Dept> pageInfo=new PageInfo<Dept>(); 	 	 	public List<Dept> getDeptList() { 		return deptList; 	}  	public void setDeptList(List<Dept> deptList) { 		this.deptList = deptList; 	}  	public DeptService getDeptservice() { 		return deptservice; 	}  	public void setDeptservice(DeptService deptservice) { 		this.deptservice = deptservice; 	} 	 	public int getIndex() { 		return index; 	}  	public void setIndex(int index) { 		this.index = index; 	}  	public PageInfo<Dept> getPageInfo() { 		return pageInfo; 	} 	 	@Test 	public void testFindHouseByConditionsByPage() { 		 		Dept conditions = new Dept(); 		conditions.setDeptName("技术部"); //		conditions.setLocation(""); 		 		//分页查询 		if(index>0&&index<=pageInfo.PAGESIZE){ 		pageInfo.setPageIndex(index); 		deptservice.findHouseByConditionsByPage(pageInfo, conditions); 		deptList = pageInfo.getPageList(); 		} 		 	}  } 

文章来源: Hibernate分页+条件查询