SQL Server 2005引入的新方法。
1 SELECT * FROM (SELECT ROW_NUMBER() OVER(ORDER BY keyField DESC) AS rowNum, * FROM tableName) AS t WHERE rowNum > start[比如:90] AND rowNum <= end[比如:100]=>[返回91-100] 2 3 SELECT top (PAGESIZE[比如:10]) FROM (SELECT ROW_NUMBER() OVER(ORDER BY keyField DESC) AS rowNum, * FROM tableName) AS t WHERE rowNum >(PAGEINDEX-1)*(PAGESIZE)[比如:90] 4 =>[返回91-100]
其中:
keyField为表tableName的一个字段(最好是主键);
tableName为查询的表名;
DESC可以按需换为ASC;
start为要取的结果集的起始记录
end为要取的结果集的结尾记录,可由:(start + pageSize)计算得出。
一般方法:表中主键必须为标识列,[ID] int IDENTITY (1,1)
建立表
1 CREATE TABLE [TestTable] 2 ( 3 [ID] [int] IDENTITY(1, 1) 4 PRIMARY KEY 5 NOT NULL , 6 [FirstName] [nvarchar](100) NULL , 7 [LastName] [nvarchar](100) NULL , 8 [Country] [nvarchar](50) NULL , 9 [Note] [nvarchar](2000) NULL 10 ) 11 GO
插入数据:(2万条,用更多的数据测试会明显一些)
SET IDENTITY_INSERT TestTable ON DECLARE @i INT SET @i = 1 WHILE @i <= 20000 BEGIN INSERT INTO TestTable ( [id] , FirstName , LastName , Country , Note ) VALUES ( @i , ‘FirstName_XXX‘ , ‘LastName_XXX‘ , ‘Country_XXX‘ , ‘Note_XXX‘ ) SET @i = @i + 1 END SET IDENTITY_INSERT TestTable OFF
1.分页方案一:(利用Not In和SELECT TOP分页)
语句形式:
SELECT TOP 10 * FROM TestTable WHERE (ID NOT IN (SELECT TOP 20 id FROM TestTable ORDER BY id)) ORDER BY ID SELECT TOP 页大小 * FROM 表 WHERE (ID NOT IN (SELECT TOP 页大小*页数 id FROM 表 ORDER BY id)) ORDER BY ID
2.分页方案二:(利用ID大于多少和SELECT TOP分页)
语句形式:
SELECT TOP 10 * FROM TestTable WHERE (ID > (SELECT MAX(id) FROM (SELECT TOP 20 id FROM TestTable ORDER BY id) AS T)) ORDER BY ID SELECT TOP 页大小 * FROM 表 WHERE (ID > (SELECT MAX(id) FROM (SELECT TOP 页大小*页数 id FROM 表 ORDER BY id) AS T)) ORDER BY ID
3.分页方案三:(利用SQL的游标存储过程分页)
CREATE PROCEDURE SqlPager @sqlstr NVARCHAR(4000) , --查询字符串 @currentpage INT , --第N页 @pagesize INT --每页行数 AS SET nocount ON DECLARE @P1 INT , --P1是游标的id @rowcount INT EXEC sp_cursoropen @P1 OUTPUT, @sqlstr, @scrollopt = 1, @ccopt = 1, @rowcount = @rowcount OUTPUT SELECT CEILING(1.0 * @rowcount / @pagesize) AS 总页数--,@rowcount as 总行数,@currentpage as 当前页 SET @currentpage = ( @currentpage - 1 ) * @pagesize + 1 EXEC sp_cursorfetch @P1, 16, @currentpage, @pagesize EXEC sp_cursorclose @P1 SET nocount OFF
其它的方案:如果没有主键,可以用临时表,也可以用方案三做,但是效率会低。
建议优化的时候,加上主键和索引,查询效率会提高。
通过SQL 查询分析器,显示比较:我的结论是,
分页方案二:(利用ID大于多少和SELECT TOP分页)效率最高,需要拼接SQL语句
分页方案一:(利用Not In和SELECT TOP分页) 效率次之,需要拼接SQL语句
分页方案三:(利用SQL的游标存储过程分页) 效率最差,但是最为通用
常用的SQL分页算法及对比
时间: 2024-10-25 22:31:41