hibernate 分页查询

public class PagerInfoBean {

private int totalNum;// 总条数
private int firstResult = 0;
private int maxResults = 20;
private int totalPage;

/**
* 总页数
*
* @return
*/
public int getTotalPage() {
if (totalNum == 0) {
return 0;
} else {
return (totalNum + maxResults - 1) / maxResults;
}
}

public int getTotalNum() {
return totalNum;
}

public void setTotalNum(int totalNum) {
this.totalNum = totalNum;
}

public int getFirstResult() {
return firstResult;
}

public void setFirstResult(int firstResult) {
this.firstResult = firstResult;
}

public int getMaxResults() {
return maxResults;
}

public void setMaxResults(int maxResults) {
this.maxResults = maxResults;
}

}

public interface BasicDAO {

public boolean saveOrUpdate(Object o);

/**
* Method queryData 查询数据
* @param hql HQL查询语句
* @return List 集合
*/
public List<?> searchData(String hql);

@SuppressWarnings("unchecked")
public Object get(Class clz, Serializable id);

@SuppressWarnings("unchecked")
public boolean delete(Class clz, Serializable id);

public int getRowCount(String hql);
}

import java.io.Serializable;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import pojo.HibernateSessionFactory;

import com.sun.org.apache.bcel.internal.generic.NEW;

public class BasicDAOImpl implements BasicDAO {
private SessionFactory sessionFactory ;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}

/**
* @author
* @param o
*            要保存的对象
* @param boolean
*            返回结果
*/
public boolean saveOrUpdate(Object o) {
Session session = sessionFactory.openSession();
Transaction t = null;
try {
t = session.beginTransaction();
session.saveOrUpdate(o);
t.commit();
return true;
} catch (HibernateException e) {
if (t != null) {
t.rollback();
}
e.printStackTrace();
return false;
}finally {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}
}

public List<?> searchData(String hql) {
Session session = sessionFactory.openSession();
List<?> list = null;
try {
Query q = session.createQuery(hql);
list = q.list();
} catch (HibernateException e) {
e.printStackTrace();
}finally {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}
return list;
}
/**
* 分页查询
* @param hql
* @param pager
* @return
*/
public List<?> searchData(String hql, PagerInfoBean pager) {
SessionFactory sessionFactory =HibernateSessionFactory.getSessionFactory();
Session session = sessionFactory.openSession();
List<?> list = null;
try {
Query q = session.createQuery(hql);
list = q.setFirstResult(pager.getFirstResult()).setMaxResults(
pager.getMaxResults()).list();
} catch (HibernateException e) {
e.printStackTrace();
}finally {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}
return list;
}

@SuppressWarnings("unchecked")
public boolean delete(Class clz, Serializable id) {
boolean result = false;
Session session = sessionFactory.openSession();
Transaction t = null;
try {
t = session.beginTransaction();
if (this.get(clz, id)!=null) {
session.delete(this.get(clz, id));
}
t.commit();
result = true;
} catch (HibernateException e) {
// TODO Auto-generated catch block
if (null != t) {
t.rollback();
}
result = false;
e.printStackTrace();
} finally {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}
return result;
}
@SuppressWarnings("unchecked")
public Object get(Class clz, Serializable id) {
Object o = null;
Session session = sessionFactory.openSession();
try {
o = session.get(clz, id);
} catch (HibernateException e) {
e.printStackTrace();
} finally {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}
return o;
}

/**
* 总记录数
*/
public int getRowCount(String hql) {
// TODO Auto-generated method stub
int rowCount=0;
Session session = sessionFactory.openSession();
try {
Query q = session.createQuery(hql);
if (q.uniqueResult()!=null) {
rowCount = Integer.parseInt(q.uniqueResult().toString());
}
} catch (HibernateException e) {
e.printStackTrace();
}finally {
if (session != null) {
if (session.isOpen()) {
session.close();
}
}
}
return rowCount;
}

}

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import pojo.HibernateSessionFactory;
import pojo.TblArea;

public class BranchInfoDAOImpl extends BasicDAOImpl{

public static void main(String[] args) {
PagerInfoBean pagers =new PagerInfoBean();
pagers.setFirstResult(3);
pagers.setMaxResults(9);
pagers.setTotalNum(10);
BranchInfoDAOImpl branchInfoDAOImpl =new BranchInfoDAOImpl();
List<TblArea> branchList=branchInfoDAOImpl.getBranchInfo(pagers);
for (TblArea tblArea : branchList) {
String areaId =tblArea.getAreaId();
String areaName=tblArea.getAreaName();
System.out.println("areaId"+areaId);
System.out.println("areaName"+areaName);
}
}
/**
* 分页查询
*/
public List<TblArea> getBranchInfo(PagerInfoBean pager) {
String hql = "from TblArea";
List<TblArea> branchList = (List<TblArea>) super.searchData(hql,pager);
return branchList;
}
}