说说oracle分页的sql语句

说说oracle分页的sql语句，分排序和不排序两种。

当结果集不需要进行排序时，每页显示条数为：rowPerPage,当前页数为：currentPage。

1、 相对来说，这种查询速度会快一些，因为当currentPage小时，嵌套语句查询的结果集小。但当currentPage 变大时，查询速度会慢慢变慢。当结果集很大时，查询第一页跟最后一页的速度会有明显变化。（倾向用这种！）

select * from(
select rownum r,  field1,field2 from table_name where rownum <= currentPage * rowPerPage
) 
where r > (currentPage-1) * rowPerPage 

2、相对来说，这种查询速度会慢一些，无论当currentPage大小，嵌套语句查询的结果集都是一样多的，都是整个结果集。但是，当结果集很大时，查询第一页跟最后一页的速度不会有明显变化。

select * from(
select rownum r,  field1,field2 from table_name 
) 
where r  > (currentPage-1) * rowPerPage  and  r <= currentPage * rowPerPage

当需要进行排序时，以第一种方式进行示例如下：

select * from(
select rownum r, a.* from (
select  field1,field2 from table_name order by field1 
) a where rownum <= currentPage * rowPerPage
) where r > (currentPage-1) * rowPerPage 

还有这个，也是很好用的：

select * from 

  (select a.*,rownum row_num from 

          (select * from tabelTest t order by t.id ) a

  ) b 

where b.row_num between (currentPage-1)*pagesize and currentPage*pagesize

后台，cs将json传入前台easy-ui的datagrid：

//
public string List(int page, int rows, string sort, string order, string DataBase)
        {
            string where = Common.HqlQeuryHelp.GetWhere(typeof(Model.TIPTOP.CPF_FILE), "CPF01,CPF02,CPF29,CPF31,CPF70,CPF35");
            //string OracelStr = "select cpf01,cpf02,cpf29,cpf31,cpk02,cqi02,cqi06,cqi09,cqi06-cqi09 as diff,cpf70,cpf35,rownum as rowi from ";
            //  OracelStr += "tekvertps.cqi_file,tekvertps.cpf_file it,tekvertps.cpk_file where cpf31=cpk01 and cpf01=cqi01 and cpf35 is null and rownum<100";
            
            string OracelStr = "select cpf01,cpf02,cpf29,cpf31,cpk02,cqi02,cqi06,cqi09,cqi06-cqi09 as diff,cpf70,cpf35,rownum as r from ";
             OracelStr += "(select cpf01,cpf02,cpf29,cpf31,cpk02,cqi02,cqi06,cqi09,cqi06-cqi09 as diff,cpf70,cpf35,rownum row_num from ";
             OracelStr += "tekvertps.cpf_file, tekvertps.cqi_file,tekvertps.cpk_file where cpf31=cpk01 and cpf01=cqi01 and cpf35 is null order by cpf01 ) it ";
             OracelStr += "where it.row_num between " + (page-1)*rows +" and " + page*rows;

            if (!string.IsNullOrEmpty(where)) { OracelStr += " and " + where; }
            OracleDataReader dr = OA.Common.OracleHelper.ExecuteReader(OA.Common.OracleHelper.ConnectionStringTipTopTPS, CommandType.Text, OracelStr, null);
            var cpfbll = new BLL.TIPTOP.CPF_FILE(DataBase);
            var count = cpfbll.GetTextCount(where);
                
                List<object> listView = new List<object>();
                foreach (var i in dr)
                {
                    listView.Add(new
                    {
                        CPF01 = dr["CPF01"].ToString(),
                        CPF02 = dr["CPF02"].ToString(),
                        CPF29 = dr["CPF29"].ToString(),
                        CPF31 = dr["CPF31"].ToString(),
                        CPK02 = dr["CPK02"].ToString(),
                        CQI02 = dr["CQI02"].ToString(),
                        CQI06 = dr["CQI06"].ToString(),
                        CQI09 = dr["CQI09"].ToString(),
                        DIFF = dr["DIFF"].ToString(),
                        CPF70 = Formate_Date((DateTime)dr["CPF70"]),
                        CPF35 = dr["CPF35"].ToString()
                    });
                }
                var ret = new
                {
                    total = count,
                    rows = listView
                };
            return ToJsonString(ret);
        }

前台（MVC easyui-datagrid）：

 <div region="center" border="false">
  <table class="easyui-datagrid" id="details" data-options="fit:true,singleSelect:true, fitColumns:true,pageSize:10,
         pagination:true,rownumbers:true,border:true,url:serverUrl.list,view: detailview,detailFormatter:detailformatter,onExpandRow:rowExpand">
   <thead>
    <tr>
     <th data-options="field:'CPF01',sortable:true,100">員工代號</th>
     <th data-options="field:'CPF02',sortable:true,100">姓名</th>
     <th data-options="field:'CPF29',sortable:true,100">部門別</th>
     <th data-options="field:'CPF31',sortable:true,100">職稱代號</th>
     <th data-options="field:'CPK02',sortable:true,100">職稱</th>
     <th data-options="field:'CQI02',sortable:true,100">年度</th>
     <th data-options="field:'CQI06',sortable:true,100">特休天數</th>
     <th data-options="field:'CQI09',sortable:true,100">已休天數</th>
     <th data-options="field:'DIFF',sortable:true,100">未休天數</th>
     <th data-options="field:'CQH071S1',sortable:true,100">事假天數</th>
     <th data-options="field:'CQH071S2',sortable:true,100">病假天數</th>
     <th data-options="field:'CPF70',sortable:true,100">到職日期</th>
     <th data-options="field:'CPF35',sortable:true,100">離職日期</th>
     </tr>
   </thead>
  </table>
 </div>