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[数据库]高效的SQLSERVER分页查询的几种示例分析


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:

1 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:

1 SELECT * FROM (2   SELECT TOP 30 * FROM (3     SELECT TOP 45030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC4   ) f ORDER BY f.YEAR ASC, f.ID DESC5 ) 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:

1 SELECT * FROM ARTICLE w1, 2 (3   SELECT TOP 30 ID FROM 4   (5     SELECT TOP 50030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC6   ) w ORDER BY w.YEAR ASC, w.ID ASC7 ) 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:

1 SELECT * FROM ARTICLE w1 2   WHERE ID in 3     (4       SELECT top 30 ID FROM 5       (6         SELECT top 45030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC7       ) w ORDER BY w.YEAR ASC, w.ID ASC8     ) 9   ORDER BY w1.YEAR DESC, w1.ID DESC;

平均查询100次所需时间:20S

第五种方案:

1 SELECT w2.n, w1.* FROM ARTICLE w1,(2   SELECT TOP 50030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE) w2 3 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:

1 SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(2   SELECT TOP 1000 ID FROM ARTICLE3   ORDER BY YEAR DESC, ID DESC) 4 ORDER BY YEAR DESC,ID DESC;

平均查询100次所需时间:80s

第二种方案:

1 SELECT * FROM(2   SELECT TOP 30 * FROM (3     SELECT TOP 1030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f 4   ORDER BY f.YEAR ASC, f.ID DESC) s 5 ORDER BY s.YEAR DESC,s.ID DESC;

平均查询100次所需时间:30S

第三种方案:

1 SELECT * FROM ARTICLE w1, 2 (3   SELECT TOP 30 ID FROM 4   (5     SELECT TOP 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC6   ) w ORDER BY w.YEAR ASC, w.ID ASC7 ) 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:

1 SELECT * FROM ARTICLE w1 2   WHERE ID in 3     (4       SELECT top 30 ID FROM 5       (6         SELECT top 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC7       ) w ORDER BY w.YEAR ASC, w.ID ASC8     ) 9   ORDER BY w1.YEAR DESC, w1.ID DESC;

平均查询100次所需时间:13S

第五种方案:

1 SELECT w2.n, w1.* FROM ARTICLE w1,(2   SELECT TOP 1030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE) w2 3 WHERE w1.ID = w2.ID AND w2.n > 1000 4 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:

 1 if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sys_Page_v2]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) 2 drop procedure [dbo].[sys_Page_v2] 3 GO 4 CREATE PROCEDURE [dbo].[sys_Page_v2] 5 @PCount int output,    --总页数输出 6 @RCount int output,    --总记录数输出 7 @sys_Table nvarchar(100),    --查询表名 8 @sys_Key varchar(50),        --主键 9 @sys_Fields nvarchar(500),    --查询字段10 @sys_Where nvarchar(3000),    --查询条件11 @sys_Order nvarchar(100),    --排序字段12 @sys_Begin int,        --开始位置13 @sys_PageIndex int,        --当前页数14 @sys_PageSize int        --页大小15 AS16 SET NOCOUNT ON17 SET ANSI_WARNINGS ON18 IF @sys_PageSize < 0 OR @sys_PageIndex < 019 BEGIN        20 RETURN21 END22 DECLARE @new_where1 NVARCHAR(3000)23 DECLARE @new_order1 NVARCHAR(100)24 DECLARE @new_order2 NVARCHAR(100)25 DECLARE @Sql NVARCHAR(4000)26 DECLARE @SqlCount NVARCHAR(4000)27 DECLARE @Top int28 if(@sys_Begin <=0)29     set @sys_Begin=030 else31     set @sys_Begin=@sys_Begin-132 IF ISNULL(@sys_Where,'') = ''33     SET @new_where1 = ' '34 ELSE35     SET @new_where1 = ' WHERE ' + @sys_Where 36 IF ISNULL(@sys_Order,'') <> '' 37 BEGIN38     SET @new_order1 = ' ORDER BY ' + Replace(@sys_Order,'desc','')39     SET @new_order1 = Replace(@new_order1,'asc','desc')40     SET @new_order2 = ' ORDER BY ' + @sys_Order41 END42 ELSE43 BEGIN44     SET @new_order1 = ' ORDER BY ID DESC'45     SET @new_order2 = ' ORDER BY ID ASC'46 END47 SET @SqlCount = 'SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/'48             + CAST(@sys_PageSize AS NVARCHAR)+') FROM ' + @sys_Table + @new_where149 EXEC SP_EXECUTESQL @SqlCount,N'@RCount INT OUTPUT,@PCount INT OUTPUT',50                @RCount OUTPUT,@PCount OUTPUT51 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52 BEGIN53     SET @sys_PageIndex =  CEILING((@RCount+0.0)/@sys_PageSize)54 END55 set @sql = 'select '+ @sys_fields +' from ' + @sys_Table + ' w1 '56     + ' where '+ @sys_Key +' in ('57         +'select top '+ ltrim(str(@sys_PageSize)) +' ' + @sys_Key + ' from '58         +'('59             +'select top ' + ltrim(STR(@sys_PageSize * @sys_PageIndex + @sys_Begin)) + ' ' + @sys_Key + ' FROM ' 60         + @sys_Table + @new_where1 + @new_order2 61         +') w ' + @new_order162     +') ' + @new_order263 print(@sql)64 Exec(@sql)65 GO