SQL Server分頁3種方案比拼

2021-08-27 09:50:51 字數 2506 閱讀 2518

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。

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