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mybatis3.05 分页收藏

Ke — Wed, 03 Aug 2011 09:15:00 GMT

以下內容來自:
http://zhaohe162.blog.163.com/blog/static/38216797201131262952990/

1.把hibernate下的dialect包全部拷贝到mybatis包的jdbc目录下，如下图所�C�：

2.定义一个ResultSetHandler Interceptor

package cn.machi.utils;

import java.sql.Statement;
import java.util.Properties;

import org.apache.ibatis.executor.resultset.FastResultSetHandler;
import org.apache.ibatis.executor.resultset.ResultSetHandler;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.RowBounds;

@Intercepts( {@Signature(type = ResultSetHandler.class, method = "handleResultSets", args = {Statement.class})})
public class DiclectResultSetHandlerInterceptor implements Interceptor
{

    public Object intercept(Invocation invocation) throws Throwable
    {
        FastResultSetHandler resultSet = (FastResultSetHandler)invocation.getTarget();

        RowBounds rowBounds = (RowBounds)ReflectUtil.getFieldValue(resultSet,
                "rowBounds");

        if (rowBounds.getLimit() > 0
                && rowBounds.getLimit() < RowBounds.NO_ROW_LIMIT)
        {
            ReflectUtil.setFieldValue(resultSet, "rowBounds", new RowBounds());
        }
        return invocation.proceed();
    }

    public Object plugin(Object target)
    {
        return Plugin.wrap(target, this);
    }

    public void setProperties(Properties properties)
    {
    }
}

3.定义一个StatementHandler的Interceptor

package cn.machi.utils;

import java.sql.Connection;
import java.util.Properties;

import org.apache.ibatis.executor.statement.PreparedStatementHandler;
import org.apache.ibatis.executor.statement.RoutingStatementHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.jdbc.dialect.OracleDialect;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.RowBounds;

@Intercepts( {@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class})})
public class DiclectStatementHandlerInterceptor implements Interceptor
{

    private static final String DIALECT = "org.apache.ibatis.jdbc.dialect.OracleDialect";

    public Object intercept(Invocation invocation) throws Throwable
    {
        RoutingStatementHandler statement = (RoutingStatementHandler)invocation.getTarget();
        PreparedStatementHandler handler = (PreparedStatementHandler)ReflectUtil.getFieldValue(statement,
                "delegate");
        RowBounds rowBounds = (RowBounds)ReflectUtil.getFieldValue(handler,
                "rowBounds");

        if (rowBounds.getLimit() > 0
                && rowBounds.getLimit() < RowBounds.NO_ROW_LIMIT)
        {
            BoundSql boundSql = statement.getBoundSql();
            String sql = boundSql.getSql();

            OracleDialect dialect = (OracleDialect)Class.forName(DIALECT)
                    .newInstance();
            sql = dialect.getLimitString(sql,
                    rowBounds.getOffset(),
                    rowBounds.getLimit());

            ReflectUtil.setFieldValue(boundSql, "sql", sql);
        }
        return invocation.proceed();
    }

    public Object plugin(Object target)
    {
        return Plugin.wrap(target, this);
    }

    public void setProperties(Properties properties)
    {
    }
}

4.定义工具�c�ReflectUtil

package cn.machi.utils;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

import org.apache.log4j.Logger;

public class ReflectUtil
{
    private static Logger log = Logger.getLogger(ReflectUtil.class);

    private static Object operate(Object obj, String fieldName,
            Object fieldVal, String type)
    {
        Object ret = null;
        try
        {
            // 获得对象�c�d��
            Class classType = obj.getClass();
            // 获得对象的所有属�?nbsp;
            Field fields[] = classType.getDeclaredFields();
            for (int i = 0; i < fields.length; i++)
            {
                Field field = fields[i];
                if (field.getName().equals(fieldName))
                {

                    String firstLetter = fieldName.substring(0, 1)
                            .toUpperCase(); // 获得和属性对应的getXXX()�Ҏ��的名�?nbsp;
                    if ("set".equals(type))
                    {
                        String setMethodName = "set" + firstLetter
                                + fieldName.substring(1); // 获得和属性对应的getXXX()�Ҏ��
                        Method setMethod = classType.getMethod(setMethodName,
                                new Class[] {field.getType()}); // 调用原对象的getXXX()�Ҏ��
                        ret = setMethod.invoke(obj, new Object[] {fieldVal});
                    }
                    if ("get".equals(type))
                    {
                        String getMethodName = "get" + firstLetter
                                + fieldName.substring(1); // 获得和属性对应的setXXX()�Ҏ��的名�?nbsp;
                        Method getMethod = classType.getMethod(getMethodName,
                                new Class[] {});
                        ret = getMethod.invoke(obj, new Object[] {});
                    }
                    return ret;
                }
            }
        }
        catch (Exception e)
        {
            log.warn("reflect error:" + fieldName, e);
        }
        return ret;
    }

    public static Object getVal(Object obj, String fieldName)
    {
        return operate(obj, fieldName, null, "get");
    }

    public static void setVal(Object obj, String fieldName, Object fieldVal)
    {
        operate(obj, fieldName, fieldVal, "set");
    }


    private static Method getDeclaredMethod(Object object, String methodName,
            Class[] parameterTypes)
    {
        for (Class superClass = object.getClass(); superClass != Object.class; superClass = superClass.getSuperclass())
        {
            try
            {
                //superClass.getMethod(methodName, parameterTypes);
                return superClass.getDeclaredMethod(methodName, parameterTypes);
            }
            catch (NoSuchMethodException e)
            {
                //Method 不在当前�c�d��? �l�箋向上转型
            }
        }

        return null;
    }


    private static void makeAccessible(Field field)
    {
        if (!Modifier.isPublic(field.getModifiers()))
        {
            field.setAccessible(true);
        }
    }


    private static Field getDeclaredField(Object object, String filedName)
    {
        for (Class superClass = object.getClass(); superClass != Object.class; superClass = superClass.getSuperclass())
        {
            try
            {
                return superClass.getDeclaredField(filedName);
            }
            catch (NoSuchFieldException e)
            {
                //Field 不在当前�c�d��? �l�箋向上转型
            }
        }
        return null;
    }


    public static Object invokeMethod(Object object, String methodName,
            Class[] parameterTypes, Object[] parameters)
            throws InvocationTargetException
    {
        Method method = getDeclaredMethod(object, methodName, parameterTypes);

        if (method == null)
        {
            throw new IllegalArgumentException("Could not find method ["
                    + methodName + "] on target [" + object + "]");
        }

        method.setAccessible(true);

        try
        {
            return method.invoke(object, parameters);
        }
        catch (IllegalAccessException e)
        {

        }

        return null;
    }


    public static void setFieldValue(Object object, String fieldName,
            Object value)
    {
        Field field = getDeclaredField(object, fieldName);

        if (field == null)
            throw new IllegalArgumentException("Could not find field ["
                    + fieldName + "] on target [" + object + "]");

        makeAccessible(field);

        try
        {
            field.set(object, value);
        }
        catch (IllegalAccessException e)
        {
            e.printStackTrace();
        }
    }


    public static Object getFieldValue(Object object, String fieldName)
    {
        Field field = getDeclaredField(object, fieldName);
        if (field == null)
            throw new IllegalArgumentException("Could not find field ["
                    + fieldName + "] on target [" + object + "]");

        makeAccessible(field);

        Object result = null;
        try
        {
            result = field.get(object);
        }
        catch (IllegalAccessException e)
        {
            e.printStackTrace();
        }

        return result;
    }

}

5.更新mapper configuration文�g�Q�添加如下几条，注意plugins在整个configuration文�g中的��序

6.使用�Ҏ��同mybatis逻辑分页�Q�拦截器会自动拦截执行SQL的地方，加上分页代码�Q?/strong>

getSqlSession().selectList(mapId, queryKey,new RowBounds(pageId, pageSize));

==============================================================
按照上面的做�?但運行時��L��出缺��?IN OUT參數之類的錯�?
後來換了Dialect��文件就OK�?OracleDialect內容參考自:
http://rapid-framework.googlecode.com/svn/trunk/rapid-framework/src/rapid_framework_common/cn/org/rapid_framework/jdbc/dialect/

Ke 2011-08-03 17:15 发表评论

用Spring的JdbcTemplate实现分页功能

Ke — Sun, 20 Apr 2008 11:32:00 GMT
�q�里用的�?a class="channel_keylink" target="_blank">Oracle数据库，使用伪列ROWNUM来实现分��c��分��代码如下：
　　
　　package com.deity.ranking.util;
        import java.util.List;
　　import org.springframework.jdbc.core.JdbcTemplate;
　　import org.springframework.jdbc.core.support.JdbcDaoSupport;
　　/** * 分页函数 *　
        * @author allenpan */
public class Pagination extends JdbcDaoSupport{
　　public static final int NUMBERS_PER_PAGE = 10;
　　//一��|��C�的记录�?br /> 　　private int numPerPage;
　　//记录��L��
　　private int totalRows;
　　//总页�?br /> 　　private int totalPages;
　　//当前��늠�
　　private int currentPage;
　　//起始行数
　　private int startIndex;
　　//�l�束行数
　　private int lastIndex;
　　//�l�果集存放List
　　private List resultList;
　　//JdbcTemplate jTemplate
　　private JdbcTemplate jTemplate;
　　/**
　　* 每页昄��10条记录的构造函�?使用该函数必��d��l�Pagination讄��currentPage�Q�jTemplate初�?br /> 　　* @param sql oracle语句
　　*/
　　public Pagination(String sql){
　　if(jTemplate == null){
　　throw new IllegalArgumentException("com.deity.ranking.util.Pagination.jTemplate is null,please initial it first. ");
　　}else if(sql.equals("")){
　　throw new IllegalArgumentException("com.deity.ranking.util.Pagination.sql is empty,please initial it first. ");
　　}
　　new Pagination(sql,currentPage,NUMBERS_PER_PAGE,jTemplate);
　　}
　　/**分页构造函�?br /> 　　* @param sql �Ҏ��传入的sql语句得到一些基本分��信�?br /> 　　* @param currentPage 当前��?br /> 　　* @param numPerPage 每页记录�?br /> 　　* @param jTemplate JdbcTemplate实例
　　*/
　　public Pagination(String sql,int currentPage,int numPerPage,JdbcTemplate jTemplate){
　　if(jTemplate == null){
　　throw new IllegalArgumentException("com.deity.ranking.util.Pagination.jTemplate is null,please initial it first. ");
　　}else if(sql == null || sql.equals("")){
　　throw new IllegalArgumentException("com.deity.ranking.util.Pagination.sql is empty,please initial it first. ");
　　}
　　//讄��每页昄��记录�?br /> 　　setNumPerPage(numPerPage);
　　//讄��要显�C�的��|��
　　setCurrentPage(currentPage);
　　//计算总记录数
　　StringBuffer totalSQL = new StringBuffer(" SELECT count(*) FROM ( ");
　　totalSQL.append(sql);
　　totalSQL.append(" ) totalTable ");
　　//�l�JdbcTemplate赋�?br /> 　　setJdbcTemplate(jTemplate);
　　//总记录数
　　setTotalRows(getJdbcTemplate().queryForInt(totalSQL.toString()));
　　//计算总页�?br /> 　　setTotalPages();
　　//计算起始行数
　　setStartIndex();
　　//计算�l�束行数
　　setLastIndex();
　　System.out.println("lastIndex="+lastIndex);//////////////////
　　//构造oracle数据库的分页语句
　　StringBuffer paginationSQL = new StringBuffer(" SELECT * FROM ( ");
　　paginationSQL.append(" SELECT temp.* ,ROWNUM num FROM ( ");
　　paginationSQL.append(sql);
　　paginationSQL.append("　) temp where ROWNUM <= " + lastIndex);
　　paginationSQL.append(" ) WHERE　num > " + startIndex);
　　//装入�l�果�?br /> 　　setResultList(getJdbcTemplate().queryForList(paginationSQL.toString()));
　　}
　　/**
　　* @param args
　　*/
　　public static void main(String[] args) {
　　// TODO Auto-generated method stub　　　　}
　　public int getCurrentPage() {
　　return currentPage;
　　}
　　public void setCurrentPage(int currentPage) {
　　this.currentPage = currentPage;
　　}
　　public int getNumPerPage() {
　　return numPerPage;
　　}
　　public void setNumPerPage(int numPerPage) {
　　this.numPerPage = numPerPage;
　　}
　　public List getResultList() {
　　return resultList;　　　　}
　　public void setResultList(List resultList) {
　　this.resultList = resultList;
　　}
　　public int getTotalPages() {
　　return totalPages;
　　}
　　//计算总页�?br /> 　　public void setTotalPages() {
　　if(totalRows % numPerPage == 0){
　　this.totalPages = totalRows / numPerPage;
　　}else{
　　this.totalPages　= (totalRows / numPerPage) + 1;
　　}
　　}
　　public int getTotalRows() {
　　return totalRows;
　　}
　　public void setTotalRows(int totalRows) {
　　this.totalRows = totalRows;
　　}
　　public int getStartIndex() {
　　return startIndex;
　　}
　　public void setStartIndex() {
　　this.startIndex = (currentPage - 1) * numPerPage;
　　}
　　public int getLastIndex() {
　　return lastIndex;
　　}
　　public JdbcTemplate getJTemplate() {
　　return jTemplate;
　　}
　　public void setJTemplate(JdbcTemplate template) {
　　jTemplate = template;
　　}
　　//计算�l�束时候的索引
　　public void setLastIndex() {
　　System.out.println("totalRows="+totalRows);///////////
　　System.out.println("numPerPage="+numPerPage);///////////
　　if( totalRows < numPerPage){
　　this.lastIndex = totalRows;
　　}else if((totalRows % numPerPage == 0) || (totalRows % numPerPage != 0 && currentPage < totalPages)){
　　this.lastIndex = currentPage * numPerPage;
　　}else if(totalRows % numPerPage != 0 && currentPage == totalPages){//最后一��?br /> 　　this.lastIndex = totalRows ;
　　}
　　}}在我的业务逻辑代码中：
　　/**
　　* find season ranking list from DC
　　* @param areaId 选手区域id
　　* @param rankDate 赛季
　　* @param category �c�d��
　　* @param characterName 角色�?br /> 　　* @return List
　　*/
　　public List findSeasonRankingList(Long areaId, int rankYear,int rankMonth,
　　Long categoryId,String characterName) {
　　//SQL语句
　　StringBuffer sql = new StringBuffer(" SELECT C.USERID userid,D.POSNAME posname,C.GAMEID gameid,C.AMOUNT amount,C.RANK rank FROM ");
　　//表　　　　　　　　　　　　sql.append(" (SELECT B.USERID USERID,");
　　sql.append(" B.POSID POSID,");
　　sql.append(" A.DISTRICT_CODE DISTRICTCODE,");
　　sql.append(" A.GAMEID GAMEID,");
　　sql.append(" AMOUNT AMOUNT,");
　　sql.append(" RANK RANK ");
　　sql.append(" FROM TB_FS_RANK A ");
　　sql.append(" LEFT JOIN TB_CHARACTER_INFO B ");
　　sql.append(" ON A.DISTRICT_CODE = B.DISTRICT_CODE ");
　　sql.append(" AND A.GAMEID = B.GAMEID ");
　　//附加条�g
　　if(areaId != null && areaId.intValue() != 0){
　　sql.append(" and A.DISTRICT_CODE = " + areaId.intValue());
　　}
　　if( rankYear > 1970 && rankMonth > 0){
　　//hql.append(" and sas.id.dt >= to_date('" + rankYear + "-" + rankMonth + "-01 00:00:00'," + "YYYY-MM-DD HH24:MI:SS");
　　//hql.append(" and sas.id.dt <= to_date('" + rankYear + "-" + rankMonth + "-" + TimeTool.findMaxDateInMonth(rankYear,rankMonth) + " 23:59:59'," + "YYYY-MM-DD HH24:MI:SS");
　　sql.append(" and A.DT = fn_time_convert(to_date('" + rankYear + "-" + rankMonth + "'," + "'YYYY-MM')) ");
　　}
　　if(categoryId != null && categoryId.intValue() != 0){
　　sql.append(" and A.CID = " + categoryId.intValue());
　　}
　　if(characterName != null && !characterName.trim().equals("")){
　　sql.append(" and A.GAMEID = '" + characterName.trim()+"' ");
　　}
　　sql.append(" ORDER BY RANK ASC) C ");
　　sql.append(" LEFT JOIN TB_FS_POSITION D ");
　　sql.append(" ON C.POSID = D.POSID ");
　　sql.append(" ORDER BY C.RANK ");
　　System.out.println("hql="+sql.toString());////////////////
　　//使用自己的分��늨�序控制结果集
　　Pagination pageInfo = new Pagination(sql.toString(),1,10,getJdbcTemplate());
　　return pageInfo.getResultList();
　　//return getJdbcTemplate().queryForList(sql.toString());
　　}
文章來源�Q�http://java.chinaitlab.com/Spring/38091.html

Ke 2008-04-20 19:32 发表评论

Ke — Mon, 05 Nov 2007 09:14:00 GMT
    只有注册用户��d��后才能阅读该文�?a href='http://www.tkk7.com/keweibo/articles/158303.html'>阅读全文

Ke 2007-11-05 17:14 发表评论

Ke — Sun, 28 Oct 2007 11:05:00 GMT
    只有注册用户��d��后才能阅读该文�?a href='http://www.tkk7.com/keweibo/articles/156515.html'>阅读全文

Ke 2007-10-28 19:05 发表评论

应用Hibernate3的DetachedCriteria实现分页查询

Ke — Sun, 21 Oct 2007 13:51:00 GMT

Hibernate3提供了DetachedCriteria�Q��得我们可以在Web层构造detachedCriteria�Q�然后调用业务层Bean�Q�进行动态条件查询，�Ҏ��q�一功能�Q�我设计了通用的抽象Bean基类和分��늱�支持�Q�代码来自于Quake Wang的javaeye-core包的相应�c�，然后又做了很多修攏V�?/p>
分页支持�c�：

class="code_title">java 代码 class="dp-highlighter"> class="bar"> class="alt">package com.javaeye.common.util;    class="">   class="alt">import java.util.List;    class="">   class="alt">public class PaginationSupport {    class="">   class="alt">    public final static int PAGESIZE = 30;    class="">   class="alt">    private int pageSize = PAGESIZE;    class="">   class="alt">    private List items;    class="">   class="alt">    private int totalCount;    class="">   class="alt">    private int[] indexes = new int[0];    class="">   class="alt">    private int startIndex = 0;    class="">   class="alt">    public PaginationSupport(List items, int totalCount) {    class="">        setPageSize(PAGESIZE);    class="alt">                setTotalCount(totalCount);    class="">        setItems(items);            class="alt">        setStartIndex(0);    class="">    }    class="alt">   class="">    public PaginationSupport(List items, int totalCount, int startIndex) {    class="alt">                setPageSize(PAGESIZE);    class="">        setTotalCount(totalCount);    class="alt">        setItems(items);            class="">        setStartIndex(startIndex);    class="alt">    }    class="">   class="alt">    public PaginationSupport(List items, int totalCount, int pageSize, int startIndex) {    class="">                setPageSize(pageSize);    class="alt">        setTotalCount(totalCount);    class="">        setItems(items);    class="alt">        setStartIndex(startIndex);    class="">    }    class="alt">   class="">    public List getItems() {    class="alt">        return items;    class="">    }    class="alt">   class="">    public void setItems(List items) {    class="alt">        this.items = items;    class="">    }    class="alt">   class="">    public int getPageSize() {    class="alt">        return pageSize;    class="">    }    class="alt">   class="">    public void setPageSize(int pageSize) {    class="alt">        this.pageSize = pageSize;    class="">    }    class="alt">   class="">    public int getTotalCount() {    class="alt">        return totalCount;    class="">    }    class="alt">   class="">    public void setTotalCount(int totalCount) {    class="alt">        if (totalCount > 0) {    class="">            this.totalCount = totalCount;    class="alt">            int count = totalCount / pageSize;    class="">            if (totalCount % pageSize > 0)    class="alt">                count++;    class="">            indexes = new int[count];    class="alt">            for (int i = 0; i < count; i++) {    class="">                indexes[i] = pageSize * i;    class="alt">            }    class="">        } else {    class="alt">            this.totalCount = 0;    class="">        }    class="alt">    }    class="">   class="alt">    public int[] getIndexes() {    class="">        return indexes;    class="alt">    }    class="">   class="alt">    public void setIndexes(int[] indexes) {    class="">        this.indexes = indexes;    class="alt">    }    class="">   class="alt">    public int getStartIndex() {    class="">        return startIndex;    class="alt">    }    class="">   class="alt">    public void setStartIndex(int startIndex) {    class="">        if (totalCount <= 0)    class="alt">            this.startIndex = 0;    class="">        else if (startIndex >= totalCount)    class="alt">            this.startIndex = indexes[indexes.length - 1];    class="">        else if (startIndex < 0)    class="alt">            this.startIndex = 0;    class="">        else {    class="alt">            this.startIndex = indexes[startIndex / pageSize];    class="">        }    class="alt">    }    class="">   class="alt">    public int getNextIndex() {    class="">        int nextIndex = getStartIndex() + pageSize;    class="alt">        if (nextIndex >= totalCount)    class="">            return getStartIndex();    class="alt">        else   class="">            return nextIndex;    class="alt">    }    class="">   class="alt">    public int getPreviousIndex() {    class="">        int previousIndex = getStartIndex() - pageSize;    class="alt">        if (previousIndex < 0)    class="">            return 0;    class="alt">        else   class="">            return previousIndex;    class="alt">    }    class="">   class="alt">}

抽象业务�c?

java 代码

/**

* Created on 2005-7-12

*/

package com.javaeye.common.business;



import java.io.Serializable;

import java.util.List;



import org.hibernate.Criteria;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.criterion.DetachedCriteria;

import org.hibernate.criterion.Projections;

import org.springframework.orm.hibernate3.HibernateCallback;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;



import com.javaeye.common.util.PaginationSupport;



public abstract class AbstractManager extends HibernateDaoSupport {



    private boolean cacheQueries = false;



    private String queryCacheRegion;



    public void setCacheQueries(boolean cacheQueries) {

        this.cacheQueries = cacheQueries;

    }



    public void setQueryCacheRegion(String queryCacheRegion) {

        this.queryCacheRegion = queryCacheRegion;

    }



    public void save(final Object entity) {

        getHibernateTemplate().save(entity);

    }



    public void persist(final Object entity) {

        getHibernateTemplate().save(entity);

    }



    public void update(final Object entity) {

        getHibernateTemplate().update(entity);

    }



    public void delete(final Object entity) {

        getHibernateTemplate().delete(entity);

    }



    public Object load(final Class entity, final Serializable id) {

        return getHibernateTemplate().load(entity, id);

    }



    public Object get(final Class entity, final Serializable id) {

        return getHibernateTemplate().get(entity, id);

    }



    public List findAll(final Class entity) {

        return getHibernateTemplate().find("from " + entity.getName());

    }



    public List findByNamedQuery(final String namedQuery) {

        return getHibernateTemplate().findByNamedQuery(namedQuery);

    }



    public List findByNamedQuery(final String query, final Object parameter) {

        return getHibernateTemplate().findByNamedQuery(query, parameter);

    }



    public List findByNamedQuery(final String query, final Object[] parameters) {

        return getHibernateTemplate().findByNamedQuery(query, parameters);

    }



    public List find(final String query) {

        return getHibernateTemplate().find(query);

    }



    public List find(final String query, final Object parameter) {

        return getHibernateTemplate().find(query, parameter);

    }



    public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria) {

        return findPageByCriteria(detachedCriteria, PaginationSupport.PAGESIZE, 0);

    }



    public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int startIndex) {

        return findPageByCriteria(detachedCriteria, PaginationSupport.PAGESIZE, startIndex);

    }



    public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int pageSize,

            final int startIndex) {

        return (PaginationSupport) getHibernateTemplate().execute(new HibernateCallback() {

            public Object doInHibernate(Session session) throws HibernateException {

                Criteria criteria = detachedCriteria.getExecutableCriteria(session);

                int totalCount = ((Integer) criteria.setProjection(Projections.rowCount()).uniqueResult()).intValue();

                criteria.setProjection(null);

                List items = criteria.setFirstResult(startIndex).setMaxResults(pageSize).list();

                PaginationSupport ps = new PaginationSupport(items, totalCount, pageSize, startIndex);

                return ps;

            }

        }, true);

    }



    public List findAllByCriteria(final DetachedCriteria detachedCriteria) {

        return (List) getHibernateTemplate().execute(new HibernateCallback() {

            public Object doInHibernate(Session session) throws HibernateException {

                Criteria criteria = detachedCriteria.getExecutableCriteria(session);

                return criteria.list();

            }

        }, true);

    }



    public int getCountByCriteria(final DetachedCriteria detachedCriteria) {

        Integer count = (Integer) getHibernateTemplate().execute(new HibernateCallback() {

            public Object doInHibernate(Session session) throws HibernateException {

                Criteria criteria = detachedCriteria.getExecutableCriteria(session);

                return criteria.setProjection(Projections.rowCount()).uniqueResult();

            }

        }, true);

        return count.intValue();

    }

}

用户在web层构造查询条件detachedCriteria�Q�和可选的startIndex�Q�调用业务bean的相应findByCriteria�Ҏ��Q�返回一个PaginationSupport的实例ps�?/p>
ps.getItems()得到已分��好的结果集
ps.getIndexes()得到分页索引的数�l?
ps.getTotalCount()得到�ȝ��果数
ps.getStartIndex()当前分页索引
ps.getNextIndex()下一��늃��?
ps.getPreviousIndex()上一��늃��?br />
文章出处:http://www.javaeye.com/topic/14657

Ke 2007-10-21 21:51 发表评论

分页昄��

Ke — Mon, 03 Sep 2007 13:49:00 GMT

package org.util;

//分页昄��
public class Pager {

private int currentPage;     //当前��?/span>
private int pageSize = 5;    //每页昄��的记录数
private int totalSize;    //总记录数
private int totalPage;    //总页�?br />

private boolean hasFirst;    //是否有首��?/span>
private boolean hasPrevious;    // 是否有上一��?/span>
private boolean hasNext;    // 是否有下一��?/span>
private boolean hasLast;    // 是否有尾��?br />
/**构造函数必��M��入两个参数当前页和总记录数
�Ҏ��当前��可以判断是否有上一��下一��늭��{?
�Ҏ��总记录数可以��出总页�?/
public Pager(int currentPage,int totalSize){

  this.currentPage = currentPage;
  this.totalSize = totalSize;
}

public int getCurrentPage() {
  return currentPage;
}
public void setCurrentPage(int currentPage) {
  this.currentPage = currentPage;
}
public boolean isHasFirst() {

  if(currentPage == 1)
   return false;
  return true;
}
public void setHasFirst(boolean hasFirst) {
  this.hasFirst = hasFirst;
}
public boolean isHasLast() {

  if(currentPage == getTotalPage())
   return false;
  return true;
}
public void setHasLast(boolean hasLast) {
  this.hasLast = hasLast;
}
public boolean isHasNext() {

  if(isHasLast())
   return true;
  return false;
}
public void setHasNext(boolean hasNext) {
  this.hasNext = hasNext;
}
public boolean isHasPrevious() {

  if(isHasFirst())
   return true;
  return false;
}
public void setHasPrevious(boolean hasPrevious) {
  this.hasPrevious = hasPrevious;
}
public int getPageSize() {
  return pageSize;
}
public void setPageSize(int pageSize) {
  this.pageSize = pageSize;
}
public int getTotalPage() {
  //计算出总页�?/span>
  totalPage = totalSize / pageSize;
  if(totalSize % pageSize != 0)
   totalPage++;
  return totalPage;
}
public void setTotalPage(int totalPage) {
  this.totalPage = totalPage;
}
public int getTotalSize() {
  return totalSize;
}
public void setTotalSize(int totalSize) {
  this.totalSize = totalSize;
}
}

Ke 2007-09-03 21:49 发表评论

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