1、收先寫個分頁的bean用來保存查詢到的數據
package utils;
import java.util.List;
public class PageBean<T> {
private int page; // 當前頁數
private int totalCount; // 總記錄數
private int totalPage; // 總頁數
private int limit; // 每頁顯示的記錄數
private List<T> list; // 每頁顯示數據的集合.
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getLimit() {
return limit;
}
public void setLimit(int limit) {
this.limit = limit;
}
public List<T> getList() {
return list;
}
public void setList(List<T> list) {
this.list = list;
}
}
2、因爲this.getHibernateTemplate()提供的方法不足以讓我們去完成分頁(單表能行,我記得findByCriteria,findByExample可以進行分頁查詢)
這個是單表的不過我自己沒試過
【DetachedCriteria來構造查詢條件,參數需要查詢的類
List l1=this.getHibernateTemplate().findByCriteria(DetachedCriteria.forClass(類CLASS), 開始記錄 , 每頁顯示記錄數);
應用實例查詢
List l2=this.getHibernateTemplate().findByExample(new 類, 開始記錄 , 每頁顯示記錄數);
】
迴歸正題:既然提供的直接方法不足以那就用間接的:
<List<Object>> List<Object> org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateCallback<List<Object>> action) throws DataAccessException
這個是在dao層的寫法
1、public List<Xsb> findAll(int first,int max){
String hql="from po.Xsb";
List<Xsb> list=this.getHibernateTemplate().execute(
new PageHibernateCallback<>(hql, null, first, max)
);
return list;
}
2、public List findAll(int first,int max){
String hql="select a.xm,b.kcm,c.id.xh,c.cj,c.xf,c.id.kch from po.Xsb a"
+ ",po.Kcb b,po.Cjb c where a.xh=c.id.xh and b.kch=c.id.kch ";
List list=this.getHibernateTemplate().execute(
new PageHibernateCallback<>(hql, null, first, max)
);
return list;
}
使用這個方法要寫一個匿名內部類去實現HibernateCallback這個接口的方法或者直接寫個工具類去實現接口)我是寫工具類PageHibernateCallback啦【直接上代碼】
package utils;
import java.sql.SQLException;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
public class PageHibernateCallback<T> implements HibernateCallback<List<T>>{//這裏使用T來指定某一類型
private String hql;
private Object[] params;//參數數組
private int startIndex;
private int pageSize;
public PageHibernateCallback(String hql, Object[] params,
int startIndex, int pageSize) {
super();
this.hql = hql;
this.params = params;
this.startIndex = startIndex;
this.pageSize = pageSize;
}
public List<T> doInHibernate(Session session) throws HibernateException,
SQLException {
//1要 執行hql語句的實例
Query query = session.createQuery(hql);
//2 實際參數
if(params != null){
for(int i = 0 ; i < params.length ; i ++){
query.setParameter(i, params[i]);
}
}
//3 分頁
query.setFirstResult(startIndex);
query.setMaxResults(pageSize);
return query.list();
}
}
然後是servers層的:
2、public PageBean<Object> findAll(int page){
int limit=5,totalPage=0;
int first=(page-1)*limit;
int totalCount=cjbDao.findNum().intValue();
if(totalCount % limit == 0){
totalPage = totalCount / limit;
}else{
totalPage = totalCount / limit + 1;
}
List list=cjbDao.findAll(first, limit);
PageBean<Object> bean=new PageBean<>();
bean.setTotalCount(totalCount);
bean.setList(list);
bean.setLimit(limit);
bean.setPage(page);
bean.setTotalPage(totalPage);
return bean;
}
-----------------------------
1、public PageBean<Xsb> findAll(int page){
int limit=5,totalPage=0;
int first=(page-1)*limit;
int totalCount=xsbDao.findNum().intValue();
if(totalCount % limit == 0){
totalPage = totalCount / limit;
}else{
totalPage = totalCount / limit + 1;
}
List<Xsb> list=xsbDao.findAll(first, limit);
PageBean<Xsb> bean=new PageBean<>();
bean.setTotalCount(totalCount);
bean.setList(list);
bean.setLimit(limit);
bean.setPage(page);
bean.setTotalPage(totalPage);
return bean;
}
這樣就完成了
題外話:想想我以前第一次寫分頁,我當時是把所有的數據都弄到前端然後用jq去隱藏顯示(當時也是無知者無畏也^v^)