码迷,mamicode.com
首页 > 数据库 > 详细

高效的SQLSERVER分页查询(推荐)

时间:2014-10-30 13:19:03      阅读:247      评论:0      收藏:0      [点我收藏+]

标签:des   style   blog   color   ar   sp   strong   数据   div   

Sqlserver数据库分页查询一直是Sqlserver的短板,闲来无事,想出几种方法,假设有表ARTICLE,字段ID、YEAR...(其他省略),数据53210条(客户真实数据,量不大),分页查询每页30条,查询第1500页(即第45001-45030条数据),字段ID聚集索引,YEAR无索引,Sqlserver版本:2008R2

第一种方案、最简单、普通的方法:


SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(SELECT TOP 45000 ID FROM ARTICLE ORDER BY YEAR DESC, ID DESC) ORDER BY YEAR DESC,ID DESC  

 

 

     平均查询100次所需时间:45s

第二种方案:


SELECT * FROM (  SELECT TOP 30 * FROM (SELECT TOP 45030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f ORDER BY f.YEAR ASC, f.ID DESC) s ORDER BY s.YEAR DESC,s.ID DESC  

 

     平均查询100次所需时间:138S

第三种方案:


SELECT * FROM ARTICLE w1, 
(
    SELECT TOP 30 ID FROM 
    (
        SELECT TOP 50030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC
    ) w ORDER BY w.YEAR ASC, w.ID ASC
) w2 WHERE w1.ID = w2.ID ORDER BY w1.YEAR DESC, w1.ID DESC

     平均查询100次所需时间:21S

第四种方案:


SELECT * FROM ARTICLE w1 
    WHERE ID in 
        (
            SELECT top 30 ID FROM 
            (
                SELECT top 45030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC
            ) w ORDER BY w.YEAR ASC, w.ID ASC
        ) 
    ORDER BY w1.YEAR DESC, w1.ID DESC

     平均查询100次所需时间:20S

第五种方案:


SELECT w2.n, w1.* FROM ARTICLE w1, (  SELECT TOP 50030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE ) w2 WHERE w1.ID = w2.ID AND w2.n > 50000 ORDER BY w2.n ASC  

     平均查询100次所需时间:15S

查询第1000-1030条记录

第一种方案:


SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(SELECT TOP 1000 ID FROM ARTICLE ORDER BY YEAR DESC, ID DESC) ORDER BY YEAR DESC,ID DESC  

 

     平均查询100次所需时间:80s

第二种方案:


SELECT * FROM  (   SELECT TOP 30 * FROM (SELECT TOP 1030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f ORDER BY f.YEAR ASC, f.ID DESC) s ORDER BY s.YEAR DESC,s.ID DESC  

   平均查询100次所需时间:30S

第三种方案:


SELECT * FROM ARTICLE w1, 
(
    SELECT TOP 30 ID FROM 
    (
        SELECT TOP 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC
    ) w ORDER BY w.YEAR ASC, w.ID ASC
) w2 WHERE w1.ID = w2.ID ORDER BY w1.YEAR DESC, w1.ID DESC

     平均查询100次所需时间:12S

第四种方案:


SELECT * FROM ARTICLE w1 
    WHERE ID in 
        (
            SELECT top 30 ID FROM 
            (
                SELECT top 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC
            ) w ORDER BY w.YEAR ASC, w.ID ASC
        ) 
    ORDER BY w1.YEAR DESC, w1.ID DESC

     平均查询100次所需时间:13S

第五种方案:


SELECT w2.n, w1.* FROM ARTICLE w1,(   SELECT TOP 1030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE) w2 WHERE w1.ID = w2.ID AND w2.n > 1000 ORDER BY w2.n ASC  

平均查询100次所需时间:14S

     由此可见在查询页数靠前时,效率3>4>5>2>1,页码靠后时5>4>3>1>2,再根据用户习惯,一般用户的检索只看最前面几页,因此选择3 4 5方案均可,若综合考虑方案5是最好的选择,但是要注意SQL2000不支持row_number()函数,由于时间和条件的限制没有做更深入、范围更广的测试,有兴趣的可以仔细研究下。

以下是根据第四种方案编写的一个分页存储过程:


if exists (select * from dbo.sysobjects where id = object_id(N[dbo].[sys_Page_v2]) and OBJECTPROPERTY(id, NIsProcedure) = 1)
drop procedure [dbo].[sys_Page_v2]
GO
 

CREATE PROCEDURE [dbo].[sys_Page_v2]
@PCount int output,    --总页数输出
@RCount int output,    --总记录数输出
@sys_Table nvarchar(100),    --查询表名
@sys_Key varchar(50),        --主键
@sys_Fields nvarchar(500),    --查询字段
@sys_Where nvarchar(3000),    --查询条件
@sys_Order nvarchar(100),    --排序字段
@sys_Begin int,        --开始位置
@sys_PageIndex int,        --当前页数
@sys_PageSize int        --页大小
AS

SET NOCOUNT ON
SET ANSI_WARNINGS ON

IF @sys_PageSize < 0 OR @sys_PageIndex < 0
BEGIN        
RETURN
END

DECLARE @new_where1 NVARCHAR(3000)
DECLARE @new_order1 NVARCHAR(100)
DECLARE @new_order2 NVARCHAR(100)
DECLARE @Sql NVARCHAR(4000)
DECLARE @SqlCount NVARCHAR(4000)

DECLARE @Top int

if(@sys_Begin <=0)
    set @sys_Begin=0
else
    set @sys_Begin=@sys_Begin-1

IF ISNULL(@sys_Where,‘‘) = ‘‘
    SET @new_where1 =  
ELSE
    SET @new_where1 =  WHERE  + @sys_Where

IF ISNULL(@sys_Order,‘‘) <> ‘‘ 
BEGIN
    SET @new_order1 =  ORDER BY  + Replace(@sys_Order,desc,‘‘)
    SET @new_order1 = Replace(@new_order1,asc,desc)

    SET @new_order2 =  ORDER BY  + @sys_Order
END
ELSE
BEGIN
    SET @new_order1 =  ORDER BY ID DESC
    SET @new_order2 =  ORDER BY ID ASC
END

SET @SqlCount = SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/
            + CAST(@sys_PageSize AS NVARCHAR)+) FROM  + @sys_Table + @new_where1

EXEC SP_EXECUTESQL @SqlCount,N@RCount INT OUTPUT,@PCount INT OUTPUT,
               @RCount OUTPUT,@PCount OUTPUT

IF @sys_PageIndex > CEILING((@RCount+0.0)/@sys_PageSize)    --如果输入的当前页数大于实际总页数,则把实际总页数赋值给当前页数
BEGIN
    SET @sys_PageIndex =  CEILING((@RCount+0.0)/@sys_PageSize)
END

set @sql = select + @sys_fields + from  + @sys_Table +  w1 
    +  where + @sys_Key + in (
        +select top + ltrim(str(@sys_PageSize)) +  + @sys_Key +  from 
        +(
            +select top  + ltrim(STR(@sys_PageSize * @sys_PageIndex + @sys_Begin)) +   + @sys_Key +  FROM  
        + @sys_Table + @new_where1 + @new_order2 
        +) w  + @new_order1
    +)  + @new_order2

print(@sql)

Exec(@sql)

GO

 


高效的SQLSERVER分页查询(推荐)

标签:des   style   blog   color   ar   sp   strong   数据   div   

原文地址:http://www.cnblogs.com/myhappylife/p/4062334.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!