茄子在线看片免费人成视频,午夜福利精品a在线观看,国产高清自产拍在线观看,久久综合久久狠狠综合

OK,我們首先創(chuàng)建一數(shù)據(jù)庫(kù)：data_Test,并在此數(shù)據(jù)庫(kù)中創(chuàng)建一表：tb_TestTable

create database data_Test --創(chuàng)建數(shù)據(jù)庫(kù)data_Test

GO

use data_Test

GO

create table tb_TestTable --創(chuàng)建表

(

id int identity(1,1) primary key,

userName nvarchar(20) not null,

userPWD nvarchar(20) not null,

userEmail nvarchar(40) null

)

GO

然后我們?cè)跀?shù)據(jù)表中插入2000000條數(shù)據(jù):

--插入數(shù)據(jù)

set identity_insert tb_TestTable on

declare @count int

set @count=1

while @count<=2000000

begin

insert into tb_TestTable(id,userName,userPWD,userEmail) values(@count,'admin','admin888','lli0077@yahoo.com.cn')

set @count=@count+1

end

set identity_insert tb_TestTable off

我首先寫了五個(gè)常用存儲(chǔ)過程：

1，利用select top 和select not in進(jìn)行分頁，具體代碼如下：

create procedure proc_paged_with_notin --利用select top and select not in

(

@pageIndex int, --頁索引

@pageSize int --每頁記錄數(shù)

)

as

begin

set nocount on;

declare @timediff datetime --耗時(shí)

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后不支技直接接參數(shù)，所以寫成了字符串@sql

select datediff(ms,@timediff,GetDate()) as 耗時(shí)

set nocount off;

end

2,利用select top 和 select max(列鍵)

create procedure proc_paged_with_selectMax --利用select top and select max(列)

(

@pageIndex int, --頁索引

@pageSize int --頁記錄數(shù)

)

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(shí)

set nocount off;

end

3,利用select top和中間變量--此方法因網(wǎng)上有人說效果最佳，所以貼出來一同測(cè)試

create procedure proc_paged_with_Midvar --利用ID>最大ID值和中間變量

(

@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(shí)

set nocount off;

end

4,利用Row_number() 此方法為SQL server 2005中新的方法,利用Row_number()給數(shù)據(jù)行加上索引

create procedure 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(shí)

set nocount off;

end

5，利用臨時(shí)表及Row_number

create procedure proc_CTE --利用臨時(shí)表及Row_number

(

@pageIndex int, --頁索引

@pageSize int --頁記錄數(shù)

)

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

OK,至此，存儲(chǔ)過程創(chuàng)建完畢，我們分別在每頁10條數(shù)據(jù)的情況下在第2頁，第1000頁，第10000頁，第100000頁，第199999頁進(jìn)行測(cè)試，耗時(shí)單位：ms 每頁測(cè)試5次取其平均值

更多信息請(qǐng)查看IT技術(shù)專欄