hibernate query分页封装 hibernate query分页封装

hibernate query分页封装

package com.ytby.util;


import java.util.List;


import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.ScrollableResults;


public class Page {
private List result; // 结果集
private int pageSize; // 页大小
private int startPage; // 起始页 从1开始
private ScrollableResults scrollableResults;
private int totalResults; // 总记录的条数
private int totalPages; // 总页数


public Page(int startPage, int pageSize, Query query) {
this.startPage = startPage;
this.pageSize = pageSize;
this.result = null;
try {
this.scrollableResults = query.scroll();
this.scrollableResults.last();
if (scrollableResults.getRowNumber() >= 0) {
this.totalResults = this.scrollableResults.getRowNumber() + 1;
} else {
this.totalResults = 0;
}
setTotalPages();
result = query.setFirstResult(
(this.getStartPage() - 1) * this.pageSize).setMaxResults(
this.pageSize).list();
} catch (HibernateException e) {
e.printStackTrace();
}
}


/**
* 得到查询结果
* 
* @return 查询结果
*/
public List getResult() {
return result;
}


/**
* 得到起始页
* 
* @return
*/
public int getStartPage() {
if (startPage < 1) {
startPage = 1;
}
if (startPage > totalPages) {
startPage = totalPages;
}
return startPage;
}


/**
* 得到记录总数
* 
* @return
*/
public int getTotalResults() {
return totalResults;
}


/**
* 得到页大小
* 
* @return
*/
public int getPageSize() {
return pageSize;
}


/**
* 判断是否是第一页
* 
* @return
*/
public boolean isFirstPage() {
return this.startPage == 1;
}


/**
* 判断是否是有后一页
* 
* @return
*/
public boolean hasNextPage() {
return this.startPage < this.totalPages;
}


/**
* 判断是否是有前一页
* 
* @return
*/
public boolean hasPreviousPage() {
return this.startPage > 1;
}


/**
* 设置总页数
* 
*/
private void setTotalPages() {
this.totalPages = this.totalResults / this.pageSize;
if (totalPages * pageSize < totalResults) {
totalPages++;
}
}


/**
* 得到总页数
* 
* @return
*/
public int getTotalPages() {
return totalPages;
}

}