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, N'IsProcedure') = 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 |