• SQL Server 存储过程的分页


    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
    建立表:
    CREATE TABLE [TestTable] (
    [ID] [int] IDENTITY (1, 1) NOT NULL ,
    [FirstName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
    [LastName] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
    [Country] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
    [Note] [nvarchar] (2000) COLLATE Chinese_PRC_CI_AS NULL
    ) ON [PRIMARY]
    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

    -------------------------------------
    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 TestTable
    WHERE (ID NOT IN
              (SELECT TOP 页大小*页数 id
             FROM 表
             ORDER BY id))
    ORDER BY ID
    -------------------------------------
    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 TestTable
    WHERE (ID >
              (SELECT MAX(id)
             FROM (SELECT TOP 页大小*页数 id
                     FROM 表
                     ORDER BY id) AS T))
    ORDER BY ID
    -------------------------------------
    分页方案三:(利用SQL的游标存储过程分页)
    create  procedure XiaoZhengGe
    @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
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  • 原文地址:https://www.cnblogs.com/itgmhujia/p/1262440.html
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