我的這段代碼是大數據量時提高分頁的效率的測試代碼
--提高分頁效率:實現分頁時只讀取顯示數據,需要先在數據庫創建數據庫“TestForPaging”
use TestForPaging
go
--創建表SomeData
create table SomeData
(
id int primary key,
name varchar(30) null,
description text
)
go
--插入數據
insert into SomeData values(1,'num1','第1條')
go
insert into SomeData values(2,'num2','第2條')
go
insert into SomeData values(3,'num3','第3條')
go
insert into SomeData values(4,'num4','第4條')
go
insert into SomeData values(5,'num5','第5條')
go
--數據條目總數
select count(*) from SomeData
go
--給每條記錄添加一個數據級別
select name,description,ROW_NUMBER() over(order by id desc)as dataLevel from SomeData
go
--查看指定的數據級別間的數據條目
select dataLevel,name,description from
(select name,description,row_number() over(order by id desc)as dataLevel from SomeData)
as datawithleverl where dataLevel between 2 and 4
go
--實現查看指定的數據級別間的數據條目的存儲過程
create procedure GetDataPaged
(
@startRowIndex int,
@maximumRows int,
@sort varchar
)
AS
--確保指定sort
if len(@sort)=0
set @sort='id'
--帶參數的查詢
select dataLevel,name,description from
(select name,description,row_number() over(order by @sort desc)as dataLevel from SomeData) AS datawithleverl
WHERE dataLevel > (@startRowIndex*10) AND dataLevel <= (@startRowIndex*10 + @maximumRows)
go
