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SQL Server 存储过程的分页,这个问题已经讨论过几年了,很多朋友在问我,所以在此发表一下我的观点
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建立表:
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CREATE TABLE [TestTable] (
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[ID] [int] IDENTITY (1, 1) NOT NULL ,
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[FirstName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
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[LastName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
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[Country] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
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[Note] [nvarchar] (2000) COLLATE Chinese_PRC_CI_AS NULL
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) ON [PRIMARY]
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GO
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插入数据:(2万条,用更多的数据测试会明显一些)
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SET IDENTITY_INSERT TestTable ON
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declare @i int
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set @i=1
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while @i<=20000
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begin
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insert into TestTable([id], FirstName, LastName, Country,Note) values(@i, 'FirstName_XXX','LastName_XXX','Country_XXX','Note_XXX')
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set @i=@i+1
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end
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SET IDENTITY_INSERT TestTable OFF
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-------------------------------------
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分页方案一:(利用Not In和SELECT TOP分页)
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语句形式:
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SELECT TOP 10 *
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FROM TestTable
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WHERE (ID NOT IN
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(SELECT TOP 20 id
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FROM TestTable
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ORDER BY id))
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ORDER BY ID
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SELECT TOP 页大小 *
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FROM TestTable
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WHERE (ID NOT IN
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(SELECT TOP 页大小*页数 id
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FROM 表
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ORDER BY id))
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ORDER BY ID
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-------------------------------------
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分页方案二:(利用ID大于多少和SELECT TOP分页)
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语句形式:
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SELECT TOP 10 *
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FROM TestTable
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WHERE (ID >
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(SELECT MAX(id)
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FROM (SELECT TOP 20 id
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FROM TestTable
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ORDER BY id) AS T))
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ORDER BY ID
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SELECT TOP 页大小 *
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FROM TestTable
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WHERE (ID >
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(SELECT MAX(id)
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FROM (SELECT TOP 页大小*页数 id
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FROM 表
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ORDER BY id) AS T))
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ORDER BY ID
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-------------------------------------
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分页方案三:(利用SQL的游标存储过程分页)
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create procedure XiaoZhengGe
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@sqlstr nvarchar(4000), --查询字符串
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@currentpage int, --第N页
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@pagesize int --每页行数
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as
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set nocount on
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declare @P1 int, --P1是游标的id
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@rowcount int
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exec sp_cursoropen @P1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output
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select ceiling(1.0*@rowcount/@pagesize) as 总页数--,@rowcount as 总行数,@currentpage as 当前页
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set @currentpage=(@currentpage-1)*@pagesize+1
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exec sp_cursorfetch @P1,16,@currentpage,@pagesize
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exec sp_cursorclose @P1
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set nocount off
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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。
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建议优化的时候,加上主键和索引,查询效率会提高。
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通过SQL 查询分析器,显示比较:我的结论是:
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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
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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
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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
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在实际情况中,要具体分析。
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