常用的SQL分页算法及对比

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 *
 FROMWHERE (ID NOT IN
           (SELECT TOP 页大小*页数 id
          FROMORDER 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 *
 FROMWHERE (ID >
           (SELECT MAX(id)
          FROM (SELECT TOP 页大小*页数 id
                  FROMORDER 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,布布扣,bubuko.com

常用的SQL分页算法及对比

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