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SSH2+Daoz项目中的分页查询
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Page.java
Java代碼 ?
import?java.util.List;?????????public?class?Page<T>{??????public?final?int?DEFAULT_PAGESIZE=?10;?????????private?List<T>?result?=?null;????????????private?int?totalRows;??????private?int?pageSize=DEFAULT_PAGESIZE;??????private?int?currentPage;??????private?int?totalPages;??????private?int?startRow;??????????????????public?Page(){????????????????}??????public?Page(int?totalRows){????????????????????this.totalRows=totalRows;????????????????????this.totalPages=totalRows/pageSize;??????????if(totalRows%pageSize!=0){??????????????totalPages++;??????????}????????????????????this.currentPage=1;????????????????????this.startRow=0;??????????????}??????????????????public?List<T>?getResult()?{??????????return?result;??????}????????public?void?setResult(List<T>?result)?{??????????this.result?=?result;??????}?????????????????public?void?previous(){??????????if(currentPage==1)??????????????return;??????????currentPage--;??????????startRow=(currentPage-1)*pageSize;??????}????????????public?void?next(){??????????if(currentPage==totalPages){??????????????return;??????????}??????????currentPage++;??????????startRow=(currentPage+1)*pageSize;??????}??????public?int?getCurrentPage()?{??????????return?currentPage;??????}????????????public?void?setCurrentPage(int?currentPage)?{????????????if(currentPage>=totalPages){??????????????if(totalPages==0)??????????????????this.currentPage=1;??????????????else??????????????????this.currentPage=totalPages;??????????}??????????if(1<currentPage&¤tPage<totalPages){??????????????this.currentPage=currentPage;??????????}??????????if(currentPage<1){??????????????this.currentPage=1;??????????}????????????????????}?????????public?int?getStartRow()?{??????????startRow=(currentPage-1)*pageSize;??????????return?startRow;??????}??????public?void?setStartRow(int?startRow)?{??????????this.startRow?=?startRow;??????}??????public?int?getTotalRows()?{??????????return?totalRows;??????}??????public?void?setTotalRows(int?totalRows)?{??????????this.totalRows?=?totalRows;??????}??????public?int?getTotalPages()?{??????????return?totalPages;??????}??????public?int?getPageSize()?{??????????return?pageSize;??????}??????public?boolean?isStart()?{??????????return?currentPage==1;??????}??????public?boolean?isEnd()?{??????????return?currentPage==totalPages||totalPages==0;??????}????}?? import java.util.List;
/*** 分頁Page類* @author zhxing** @param <T>*/
public class Page<T>{public final int DEFAULT_PAGESIZE= 10; // 每頁記錄數 private List<T> result = null;//頁面數據private int totalRows;//總記錄數private int pageSize=DEFAULT_PAGESIZE;//每頁顯示行數private int currentPage;//當前頁數private int totalPages;//總頁數private int startRow;//查詢開始的記錄數public Page(){}public Page(int totalRows){//初始化總記錄數this.totalRows=totalRows;//初始化總頁數this.totalPages=totalRows/pageSize;if(totalRows%pageSize!=0){totalPages++;}//初始化當前頁數this.currentPage=1;//初始化查詢開始的記錄數this.startRow=0; }// 頁內的數據列表.public List<T> getResult() {return result;}public void setResult(List<T> result) {this.result = result;}// 獲得上一頁public void previous(){if(currentPage==1)return;currentPage--;startRow=(currentPage-1)*pageSize;}//獲得下一頁public void next(){if(currentPage==totalPages){return;}currentPage++;startRow=(currentPage+1)*pageSize;}public int getCurrentPage() {return currentPage;}//設置當前頁public void setCurrentPage(int currentPage) {if(currentPage>=totalPages){if(totalPages==0)this.currentPage=1;elsethis.currentPage=totalPages;}if(1<currentPage&¤tPage<totalPages){this.currentPage=currentPage;}if(currentPage<1){this.currentPage=1;}} public int getStartRow() {startRow=(currentPage-1)*pageSize;return startRow;}public void setStartRow(int startRow) {this.startRow = startRow;}public int getTotalRows() {return totalRows;}public void setTotalRows(int totalRows) {this.totalRows = totalRows;}public int getTotalPages() {return totalPages;}public int getPageSize() {return pageSize;}public boolean isStart() {return currentPage==1;}public boolean isEnd() {return currentPage==totalPages||totalPages==0;}}
?BaseDao.java
?
Java代碼 ?
import?java.io.Serializable;??import?java.util.List;????public?interface?BaseDao<T,ID?extends?Serializable>?{???????????????public?void?save(T?entity);???????????????public?void?delete(T?entity);????????????????public?void?deleteById(Class<T>?entityClass,ID?id);???????????????public?void?update(T?entity);?????????????????public?T?findById(Class<T>?entityClass,ID?id);????????????????public?List<T>?findAll(Class<T>?entityClass);?????????????????public?List<Object>?find(String?hql,?Object...?values);????????????????????public?Page<T>?findByPage(final?String?hql,final?String?countHql,final?int?currentPage);????????}?? import java.io.Serializable;
import java.util.List;public interface BaseDao<T,ID extends Serializable> {/*** 保存實體* @param entity 實體類*/public void save(T entity);/*** 刪除實體* @param entity 實體類*/public void delete(T entity);/*** 根據實體id 刪除實體* @param entityClass 實體類* @param id 實體id*/public void deleteById(Class<T> entityClass,ID id);/*** 更新實體* @param entity 實體類*/public void update(T entity);/*** 根據實體id 查詢單個實體* @param entityClass 實體類* @param id 實體id* @return*/public T findById(Class<T> entityClass,ID id);/*** 列出所有實體集合* @param entityClass 實體類* @return 實體類List*/public List<T> findAll(Class<T> entityClass);/*** 根據實體參數，查詢符合條件的實體類集合* @param hql * @param values 參數* @return*/public List<Object> find(String hql, Object... values);/*** 根據hql 語句，返回Page 類* @param page Page類* @param hql @param hql* @param currentPage 當前頁碼* @return
*/public Page<T> findByPage(final String hql,final String countHql,final int currentPage);}
?
BaseHibernateDao.java
?
Java代碼 ?
import?java.io.Serializable;??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;??import?org.springframework.orm.hibernate3.support.HibernateDaoSupport;????public?class?BaseHibernateDao<T,ID?extends?Serializable>?extends?HibernateDaoSupport?implements?BaseDao<T,ID>?{????????@Override??????public?void?delete(T?entity)?{??????????this.getHibernateTemplate().delete(entity);????????????????}????????@Override??????public?void?deleteById(Class<T>?entityClass,?ID?id)?{??????????delete(this.findById(entityClass,?id));????????????????}????????@Override??????public?T?findById(Class<T>?entityClass,?ID?id)?{??????????return?(T)this.getHibernateTemplate().get(entityClass,?id);??????}????????@Override??????public?List<T>?findAll(Class<T>?entityClass)?{??????????String?name=entityClass.getName();??????????return?this.getHibernateTemplate().find("from"+name);??????}????????@Override??????public?void?save(T?entity)?{??????????this.getHibernateTemplate().save(entity);??????}????????@Override??????public?void?update(T?entity)?{??????????this.getHibernateTemplate().update(entity);??????}????????@Override??????public?List<Object>?find(String?hql,?Object...?values)?{??????????return?this.getHibernateTemplate().find(hql,values);??????}????????@Override??????public?Page<T>?findByPage(final?String?hql,final?String?countHql,final?int?currentPage)?{????????????????????return?(Page<T>)this.getHibernateTemplate().execute(new?HibernateCallback(){??????????????@Override??????????????public?Object?doInHibernate(Session?session)??????????????????????throws?HibernateException,?SQLException?{????????????????????????????????????Page<T>?page=new?Page<T>(getCount(session,?countHql));??????????????????page.setCurrentPage(currentPage);???????????????????????????????????????????????????????????????Query?query=session.createQuery(hql);??????????????????query.setFirstResult(page.getStartRow());??????????????????query.setMaxResults(page.getPageSize());????????????????????????????????????page.setResult(query.list());??????????????????return?page;??????????????}????????????????????????????private?int?getCount(Session?session,String?countHql){??????????????????Long?count=0L;??????????????????List?list=session.createQuery(countHql).list();??????????????????if(list!=null&&list.size()==1)??????????????????????count=(Long)list.get(0);??????????????????return?count.intValue();??????????????}??????????});??????}??????}?
轉載于:https://www.cnblogs.com/sailormoon/archive/2012/12/20/2827024.html
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