建立表:
create table [testtable] (
[id] [int] identity (1, 1) not null ,
[firstname] [nvarchar] (100) collate chinese_prc_ci_as null ,
[lastname] [nvarchar] (100) collate chinese_prc_ci_as null ,
[country] [nvarchar] (50) collate chinese_prc_ci_as null ,
[note] [nvarchar] (2000) collate chinese_prc_ci_as null
) on [primary]
go插入資料:(2萬條,用更多的資料測試會明顯一些)
set identity_insert testtable on
declare @i int
set @i=1
while @i<=20000
begin
insert into testtable([id], firstname, lastname, country,note) values(@i, 'firstname_***','lastname_***','country_***','note_***')
set @i=@i+1
endset identity_insert testtable off
-------------------------------------
分頁方案一:(利用not in和select top分頁)
語句形式:
select top 10 *
from testtable
where (id not in
(select top 20 id
from testtable
order by id))
order by id
select top 頁大小 *
from testtable
where (id not in
(select top 頁大小*頁數 id
from 表
order by id))
order by id
-------------------------------------
分頁方案二:(利用id大於多少和select top分頁)
語句形式:
select top 10 *
from testtable
where (id >
(select max(id)
from (select top 20 id
from testtable
order by id) as t))
order by id
select top 頁大小 *
from testtable
where (id >
(select max(id)
from (select top 頁大小*頁數 id
from 表
order by id) as t))
order by id
-------------------------------------
分頁方案三:(利用sql的游標儲存過程分頁)
create procedure xiaozhengge
@sqlstr nvarchar(4000), --查詢字串
@currentpage int, --第n頁
@pagesize int --每頁行數
asset nocount on
declare @p1 int, --p1是游標的id
@rowcount int
exec sp_cursoropen @p1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output
select ceiling(1.0*@rowcount/@pagesize) as 總頁數--,@rowcount as 總行數,@currentpage as 當前頁
set @currentpage=(@currentpage-1)*@pagesize+1
exec sp_cursorfetch @p1,16,@currentpage,@pagesize
exec sp_cursorclose @p1
set nocount off
其它的方案:如果沒有主鍵,可以用臨時表,也可以用方案三做,但是效率會低。
建議優化的時候,加上主鍵和索引,查詢效率會提高。
通過sql 查詢分析器,顯示比較:我的結論是:
分頁方案二:(利用id大於多少和select top分頁)效率最高,需要拼接sql語句
分頁方案一:(利用not in和select top分頁) 效率次之,需要拼接sql語句
分頁方案三:(利用sql的游標儲存過程分頁) 效率最差,但是最為通用
在實際情況中,要具體分析。
SQL Server分頁3種方案比拼
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