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    這里用的是Oracle數據庫,使用偽列ROWNUM來實現分頁。分頁代碼如下:
      
      package com.deity.ranking.util;
            import java.util.List;
      import org.springframework.jdbc.core.JdbcTemplate;
      import org.springframework.jdbc.core.support.JdbcDaoSupport;
      /** * 分頁函數 * 
            * @author allenpan */
    public class Pagination extends JdbcDaoSupport{
      public static final int NUMBERS_PER_PAGE = 10;
      //一頁顯示的記錄數
      private int numPerPage;
      //記錄總數
      private int totalRows;
      //總頁數
      private int totalPages;
      //當前頁碼
      private int currentPage;
      //起始行數
      private int startIndex;
      //結束行數
      private int lastIndex;
      //結果集存放List
      private List resultList;
      //JdbcTemplate jTemplate
      private JdbcTemplate jTemplate;
      /**
      * 每頁顯示10條記錄的構造函數,使用該函數必須先給Pagination設置currentPage,jTemplate初值
      * @param sql oracle語句
      */
      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);
      }
      /**分頁構造函數
      * @param sql 根據傳入的sql語句得到一些基本分頁信息
      * @param currentPage 當前頁
      * @param numPerPage 每頁記錄數
      * @param jTemplate JdbcTemplate實例
      */
      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. ");
      }
      //設置每頁顯示記錄數
      setNumPerPage(numPerPage);
      //設置要顯示的頁數
      setCurrentPage(currentPage);
      //計算總記錄數
      StringBuffer totalSQL = new StringBuffer(" SELECT count(*) FROM ( ");
      totalSQL.append(sql);
      totalSQL.append(" ) totalTable ");
      //給JdbcTemplate賦值
      setJdbcTemplate(jTemplate);
      //總記錄數
      setTotalRows(getJdbcTemplate().queryForInt(totalSQL.toString()));
      //計算總頁數
      setTotalPages();
      //計算起始行數
      setStartIndex();
      //計算結束行數
      setLastIndex();
      System.out.println("lastIndex="+lastIndex);//////////////////
      //構造oracle數據庫的分頁語句
      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);
      //裝入結果集
      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;
      }
      //計算總頁數
      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;
      }
      //計算結束時候的索引
      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){//最后一頁
      this.lastIndex = totalRows ;
      }
      }}在我的業務邏輯代碼中:
      /**
      * find season ranking list from DC
      * @param areaId 選手區域id
      * @param rankDate 賽季
      * @param category 類別
      * @param characterName 角色名
      * @return List
      */
      public List findSeasonRankingList(Long areaId, int rankYear,int rankMonth,
      Long categoryId,String characterName) {
      //SQL語句
      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 ");
      //附加條件
      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());////////////////
      //使用自己的分頁程序控制結果集
      Pagination pageInfo = new Pagination(sql.toString(),1,10,getJdbcTemplate());
      return pageInfo.getResultList();
      //return getJdbcTemplate().queryForList(sql.toString());
      }
    文章來源:http://java.chinaitlab.com/Spring/38091.html

    posted on 2008-04-20 19:32 Ke 閱讀(5021) 評論(0)  編輯  收藏 所屬分類: springjdbcpagination
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