sql存儲過程分頁

⑴ oracle:寫一個用於分頁的存儲過程.調用的時候可以傳參

select
*
from
(select
a.*,rownum
r
from
(select
*
from
table_a)
a
where
rownum<=b)
where
r>=a
該sql語句實現了分頁查詢。
其中table_a表示你要查詢的那張表，r>=a，rownum<=b中的a和b表示需要查詢的記錄的起止數。
需要做分頁的話，上面的b可以改成currentPage*pageCount，a可以改成(currentPage-1)*pageCount,
currentPage表示當前頁數，pageCount表示總頁數

⑵ 如果在資料庫中有大數據量，而我們用分頁存儲過程，怎麼樣才能效率高

--------------------------------
--關於分頁儲存的效率問題
--5個存儲過程都是採用不同的方式
--------------------------------
------------------------------------------
--利用select top 和select not in進行分頁--
------------------------------------------
create procere proc_paged_with_notin --利用select top and select not in
(
@pageIndex int, --頁索引
@pageSize int --每頁記錄數
)
as
begin
set nocount on;
declare @timediff datetime --耗時
declare @sql nvarchar(500)
select @timediff=Getdate()
set @sql='select top '+str(@pageSize)+' * from tb_TestTable where(ID not in(select top '+str(@pageSize*@pageIndex)+' id from tb_TestTable order by ID ASC)) order by ID'
execute(@sql) --因select top後不支技直接接參數，所以寫成了字元串@sql
select datediff(ms,@timediff,GetDate()) as 耗時
set nocount off;
endexec proc_paged_with_notin 10000,10
--------------------------------------
--利用select top 和 select max(列鍵)--
--------------------------------------
create procere proc_paged_with_selectMax --利用select top and select max(列)
(
@pageIndex int, --頁索引
@pageSize int --頁記錄數
)
as
begin
set nocount on;
declare @timediff datetime
declare @sql nvarchar(500)
select @timediff=Getdate()
set @sql='select top '+str(@pageSize)+' * From tb_TestTable where(ID>(select max(id) From (select top '+str(@pageSize*@pageIndex)+' id From tb_TestTable order by ID) as TempTable)) order by ID'
execute(@sql)
select datediff(ms,@timediff,GetDate()) as 耗時
set nocount off;
end--------------------------------------------------------
--利用select top和中間變數--此方法因網上有人說效果最佳--
--------------------------------------------------------
create procere proc_paged_with_Midvar --利用ID>最大ID值和中間變數
(
@pageIndex int,
@pageSize int
)
as
declare @count int
declare @ID int
declare @timediff datetime
declare @sql nvarchar(500)
begin
set nocount on;
select @count=0,@ID=0,@timediff=getdate()
select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then ID else @ID end from tb_testTable order by id
set @sql='select top '+str(@pageSize)+' * from tb_testTable where ID>'+str(@ID)
execute(@sql)
select datediff(ms,@timediff,getdate()) as 耗時
set nocount off;
end
---------------------------------------------------------------------------------------
--利用Row_number() 此方法為SQL server 2005中新的方法,利用Row_number()給數據行加上索引--
---------------------------------------------------------------------------------------
create procere proc_paged_with_Rownumber --利用SQL 2005中的Row_number()
(
@pageIndex int,
@pageSize int
)
as
declare @timediff datetime
begin
set nocount on;
select @timediff=getdate()
select * from (select *,Row_number() over(order by ID asc) as IDRank from tb_testTable) as IDWithRowNumber where IDRank>@pageSize*@pageIndex and IDRank<@pageSize*(@pageIndex+1)
select datediff(ms,@timediff,getdate()) as 耗時
set nocount off;
end
--------------------------
--利用臨時表及Row_number--
--------------------------
create procere proc_CTE --利用臨時表及Row_number
(
@pageIndex int, --頁索引
@pageSize int --頁記錄數
)
as
set nocount on;
declare @ctestr nvarchar(400)
declare @strSql nvarchar(400)
declare @datediff datetime
begin
select @datediff=GetDate()
set @ctestr='with Table_CTE as
(select ceiling((Row_number() over(order by ID ASC))/'+str(@pageSize)+') as page_num,* from tb_TestTable)';
set @strSql=@ctestr+' select * From Table_CTE where page_num='+str(@pageIndex)
end
begin
execute sp_executesql @strSql
select datediff(ms,@datediff,GetDate())
set nocount off;
end
我們分別在每頁10條數據的情況下在第2頁，第1000頁，第10000頁，第100000頁，第199999頁進行測試，耗時單位：ms 每頁測試5次取其平均值 存過第2頁耗時第1000頁耗時第10000頁耗時第100000頁耗時第199999頁耗時效率排行1用not in0ms16ms47ms475ms953ms32用select max5ms16ms35ms325ms623ms13中間變數_number0ms0ms34ms365ms710ms24臨時表780ms796ms798ms780ms805ms4正好我正在研究這個問題 給大家分享