Mybatis的分页查询

    //分页列出联系记录
    @RequestMapping(value="toPage/customerRecord")
    public String listRelationRecord(Map map,String beginTime,String endTime,
            String uname,Long curPage){
        Map<String,Object> map1 = new HashMap<String, Object>();
        if(beginTime!= null && !"".equals(beginTime)){
            map1.put("beginTime",beginTime);
        }
        if(endTime != null && !"".equals(endTime)){
            map1.put("endTime",endTime);
        }
        if(uname != null && !"".equals(uname)){
            map1.put("uname","%"+uname+"%");
        }
        if(curPage == null){
            curPage=(long) 1;
        }
        Page page = relationService.getPageDataRecord(curPage, 4, map1);
        map.put("page", page);
        return "Relation/ListRelationRecord";
    }

   //分页列出联系记录
    public Page getPageDataRecord(long curPage , long pageRows ,Map map){
        return relationDaoImpl.getPageDataRecord(curPage, pageRows, map);
    }

   /**
     * 分页列出联系记录
     * @param curPage 当前页
     * @param pageRows 每页的行数
     * @param map 传给mybatis的参数Map
     * @return
     */
    public Page getPageDataRecord(long curPage , long pageRows ,Map map){
        //初始化Page
        Page page = new Page();
        
        //获取联系记录的总记录数
        long count = session.selectOne(Relation.class.getName()+".getCountRecord",map);
        
        //获取总页数=（总记录数+每页的行数-1）/每页的行数。如：总记录数为24条，每页的行数为4条，则共有：(24+4-1)/4=6页
        long allPage = (count+pageRows -1)/pageRows;
        
        //设置当前页
        if(curPage < 1)curPage = 1;//如果当前页小于1则设当前页为第1页
        if(allPage > 0 && curPage > allPage ) curPage = allPage;//如果当前页大于总页数则设当前页为总页数（即尾页）
        
        //将查询的开始记录偏移量、最大查询记录数放到map中
        map.put("start", (curPage -1)* pageRows);//查询记录的偏移量=（当前页-1）*每页的行数。如当前页为2，则查询记录的偏移量为(2-1)*4=4
        map.put("stop", pageRows);//最大查询数=每页的行数
        
        //获取联系记录数据
        List<Relation> dataList = session.selectList(Relation.class.getName()+".getDataListRecord",map);
        //设置page的当前页
        page.setCurPage(curPage);
        //设置page的每页的行数
        page.setPageRows(pageRows);
        //设置page的总页数
        page.setPageNum(allPage);
        //设置page的数据
        page.setDataList(dataList);
        //返回page
        return page;
    }

 <!-- 获取联系记录的总记录数 -->
  <select id="getCountRecord" resultType="long" parameterType="Map">
      select count(*) from user u,relation r,linkman l,customer c where
       r.lid=l.lid and r.uid=u.uid and l.cid=c.cid
      <if test="beginTime != null">
        <![CDATA[AND redate >= #{beginTime}]]>
    </if>
    <if test="endTime != null">
        <![CDATA[AND redate <= #{endTime}]]>
    </if>
    <if test="uname != null">
        and username like #{uname}
    </if>
  </select>

<!-- 列出联系记录分页 -->
  <select id="getDataListRecord" resultMap="listRelation" parameterType="Map">
      select reid,r.lid,content,c.cid,cname,redate,nextdate,nextremark,l.lname,r.uid,u.username,
       l.phone,c.statues,c.address from user u,relation r,linkman l,customer c where
       r.lid=l.lid and r.uid=u.uid and l.cid=c.cid
      <if test="beginTime != null">
        <![CDATA[AND redate >= #{beginTime}]]>
    </if>
    <if test="endTime != null">
        <![CDATA[AND redate <= #{endTime}]]>
    </if>
    <if test="uname != null">
        and username like #{uname}
    </if>
      order by redate desc limit #{start},#{stop}
  </select>

   //分页列出联系计划
    @RequestMapping(value="toPage/customerPlan")
    public String listRelation(Map map,String beginTime,String endTime,
            String uname,Long curPage){
        Map<String,Object> map1 = new HashMap<String, Object>();
        if(beginTime!= null && !"".equals(beginTime)){
            map1.put("beginTime",beginTime);
        }
        if(endTime != null && !"".equals(endTime)){
            map1.put("endTime",endTime);
        }
        if(uname != null && !"".equals(uname)){
            map1.put("uname","%"+uname+"%");
        }
        if(curPage == null){
            curPage=(long) 1;
        }
        Page page = relationService.getRePlanList(curPage, 4, map1);
        map.put("page", page);
        return "Relation/listRelation";
    }

    //分页列出联系计划
    public Page getRePlanList(long curPage, long pageRows, Map map){
        return relationDaoImpl.getRePlanList(curPage,pageRows,map);
    }

@Repository
public class RelationDaoImpl extends BaseDaoImpl<Relation>{
    //分页列出联系计划
    public Page getRePlanList(long curPage, long pageRows, Map map){
        return super.getPageData(curPage, pageRows, map);
    }
    
}

public class BaseDaoImpl<T>  {
/**
     * 分页
     * @param curPage 当前页
     * @param pageRows 每页的条数
     * @param map
     * @return
     */
    public Page getPageData(long curPage , long pageRows ,Map map){
        Page page = new Page();
        
        long count = session.selectOne(clazz.getName()+".getCount",map);//获取数据的总条数
        long allPage = (count+pageRows -1)/pageRows;//根据每页的行数+总条数获取总页数
        
        //设置当前页
        if(curPage < 1)curPage = 1;//如果当前页小于1则设当前页的值为1
        if(allPage > 0 && curPage > allPage ) curPage = allPage;//如果当前页大于总页数则设当前页为总页数
        
        map.put("start", (curPage -1)* pageRows);//设置查询的起始值
        map.put("stop", pageRows);//设置返回的最大条数——即每页的行数
        
        //获取数据
        List<T> dataList = session.selectList(clazz.getName()+".getDataList",map);
        page.setCurPage(curPage);//当前页
        page.setPageRows(pageRows);//每页的行数
        page.setPageNum(allPage);//总页数
        page.setDataList(dataList);//数据
        
        return page;
    }
    
}

<!-- 获取联系计划的总记录数 -->
  <select id="getCount" resultType="long" parameterType="Map">
      select count(*) from 
      linkman l,relation r,customer c,user u where 
      r.lid=l.lid and r.uid=u.uid and l.cid=c.cid and nextdate>now()
      <if test="beginTime != null">
        <![CDATA[AND nextdate >= #{beginTime}]]>
    </if>
    <if test="endTime != null">
        <![CDATA[AND nextdate <= #{endTime}]]>
    </if>
    <if test="uname != null">
        and username like #{uname}
    </if>
  </select>

  <!-- 获取联系计划分页数据 -->
  <select id="getDataList" resultMap="listRelation" parameterType="Map">
      Select reid,redate,content,nextdate, nextremark,u.uid,username,
      l.lid,l.lname,lsex,l.phone,c.cid,cname,c.statues,c.address from 
      linkman l,relation r,customer c,user u where 
      r.lid=l.lid and r.uid=u.uid and l.cid=c.cid and nextdate>now()
     <if test="beginTime != null">
        <![CDATA[AND nextdate >= #{beginTime}]]>
     </if>
     <if test="endTime != null">
        <![CDATA[AND nextdate <= #{endTime}]]>
     </if>
     <if test="uname != null">
        and username like #{uname}
     </if>
      order by nextdate desc limit #{start},#{stop}
  </select>