MSSQLServer数据库的分页问题

create proc up_PageView
(
    @tableName sysname,
    @colKey    nvarchar(100),
    @pageCurrent int = 1,
    @pageSize int = 10,
    @colShow nvarchar(4000) = '',
    @colOrder nvarchar(200) = '',
    @where nvarchar(2000) = '',
    @pageCount int output
)
as
begin
    if object_id(@tableName) is null
    begin
    raiserror('the table is not existing!', 16,1)
    return
    end
    if  isnull(@colShow, '') = ''
        set @colShow  = '*'
    if isnull(@colOrder,'') = ''
        set @colOrder = ''
    else
        set @colOrder = 'order by ' + @colOrder
    if isnull(@where, '') = ''
        set @where = ''
    else
        set @where = 'where '+ @where
    declare @sql nvarchar(4000)
    if @pageCount is null
        begin
        set @sql = 'select @pageCount = count(*) from ' + @tableName + ' ' + @where
        Exec sp_executesql @sql, '@pageCount int output', @pageCount output
        set @pageCount = (@pageCount + @pageSize -1)/@pageSize
        end
    if @pageCurrent = 1
        set @sql = 'select top' +' ' + convert(nvarchar(10), @pageSize) + ' '
                + @colshow + ' ' + 'from ' + @tableName + ' ' + @where + ' ' + @colOrder
    else
        begin
        set @sql = 'select top' +' ' + convert(nvarchar(10), @pageSize) + ' '
                + @colshow + ' ' + 'from ' + @tableName + ' ' + @where
        set @sql = @sql + ' ' + 'and '+ @colKey +' not in ( '
                + 'select top' +' ' + convert(nvarchar(10), (@pageCurrent - 1) * @pageSize) + ' '
                + @colKey + ' ' + 'from ' + @tableName + ' ' + @where  + ' )'
        set @sql = @sql + ' ' + @colOrder
        end
    --execute the dynamic query
    exec (@sql)
end

         这种方法的缺点是为了排除该页以前的页， 必须使用top n取大量的数据并缓存起来，在关联元表查询出最终结果，这样做的效率比较低。通常情况下， 我们都是对单主健（使用单个字段定位纪录）的表进行分页查询。因此，如果能使用一个字符串变量纪录指定页的所有主健，在使用in子句配合纪录的指定页主健就可以查询出最终的结果来。下面是改进的存储过程：

 create proc up_PageView
(
    @tableName sysname,
    @colKey    nvarchar(100),
    @pageCurrent int = 1,
    @pageSize int = 10,
    @colShow nvarchar(4000) = '',
    @colOrder nvarchar(200) = '',
    @where nvarchar(2000) = '',
    @pageCount int output
)
as
begin
    if object_id(@tableName) is null
    begin
    raiserror('the table is not existing!', 16,1)
    return
    end
    if  isnull(@colShow, '') = ''
        set @colShow  = '*'
    if isnull(@colOrder,'') = ''
        set @colOrder = ''
    else
        set @colOrder = 'order by ' + @colOrder
    if isnull(@where, '') = ''
        set @where = ''
    else
        set @where = 'where '+ @where
    declare @sql nvarchar(4000)
    if @pageCount is null
        begin
        set @sql = 'select @pageCount = count(*) from ' + @tableName + ' ' + @where
        Exec sp_executesql @sql, '@pageCount int output', @pageCount output
        set @pageCount = (@pageCount + @pageSize -1)/@pageSize -- get total pages
        end
    if @pageCurrent = 1
        begin
        set @sql = N'select top' +N' ' + convert(nvarchar(10), @pageSize) + N' '
                + @colshow + N' ' + N'from ' + @tableName + N' ' + @where + N' ' + @colOrder
        exec (@sql)
        end
    else
        begin
        declare @topN int, @topN1 int
--        set @topN = @pageSize
--        set @topN1 = @pageCurrent * @pageSize
        set @pageCurrent = @pageCurrent * @pageSize
        set @sql = N'select @n = @n - 1, @s = case when @n < ' + convert(nvarchar(10), @pageSize) +
                    N' then @s + '','' + quotename(@colKey, N'''''''') ' + N'else ''''' + N' end '
                    + N' from '+ @tableName + N' ' + @where
        --make query effect only @pageCurrent records
        --Query only top @pageCurrent * @pageSize
        set rowcount @pageCurrent
        exec sp_executesql @sql, '@n int, @s nvarchar(max) output', @pageCurrent, @sql output
        set rowcount 0 --recover to default config
        set @sql = stuff(@sql, 1, 1, N'') -- remove the first ','
        --exec the query
        Exec (N'select ' + @colShow + N' ' + 'from' + N' ' + @tableName + N' ' 
                + N'where ' + @colKey + N' in (' + @sql + ')' + @colOrder)
        end
end
go

         另外， sql server 2005 增加了一些新的功能如取得排名或顺序的函数（Rank(), Dense_Rank(), Row_Number()）, 利用这些新的功能也能进行分页处理，下面以sql server 2005 自带的数据库AdventureWorks为例结合Row_Number() 实现分页处理：

create proc up_GetPagen
(
    @pageSize int,
    @pageCurrent int
)
as
begin
    select * from
    (select ROW_NUMBER() over(ORDER BY productid) RowNum, * from production.product )OrderData
    where RowNum between (@pageCurrent - 1)*@pageSize + 1 and @pageCurrent * @pageSize
    order by productid
end

      不尽如此，这种新功能有许多妙用， 如可以取班级排名前N名或第n名到第m名的学生等等，这类问题将会在我以后的文章中进行讨论！这是我的第一篇博客， 呵呵，处来砸到，讨论的问题希望对大家有所帮助，另外，如有疑难或错误之处，敬请指出！