(SQL Server)分页的存储过程

http://www.cnitblog.com/ffan/archive/2005/07/30/1194.html

寻梦岁月
寻梦的岁月不言辛苦几许,不问收获几多…

(SQL Server)分页的存储过程

CREATE procedure main_table_pwqzc


(@pagesize int,


@pageindex int,


@docount bit,


@this_id int)


as


if(@docount=1)


begin


select count(id) from luntan where this_id=@this_id


end


else


begin


declare @PageLowerBound int


declare @PageUpperBound int


set @PageLowerBound=(@pageindex-1)*@pagesize


set @PageUpperBound=@PageLowerBound+@pagesize


create table #pageindex(id int identity(1,1) not null,nid int)


set rowcount @PageUpperBound


insert into #pageindex(nid)


select id from luntan where this_id=@this_id order by reply_time desc


select O.*


from luntan O,#pageindex p


where O.id=p.nid and p.id>@PageLowerBound and p.id<=@PageUpperBound order by p.id


end


GO

存储过程会根据传入的参数@docount来确定是不是要返回所有要分页的记录总数

特别是这两行

set rowcount @PageUpperBound

insert into @indextable(nid) select id from luntan where
this_id=@this_id order by reply_time desc

真的是妙不可言!!set rowcount @PageUpperBound当记录数达到@PageUpperBound时就会停止处理查询

,select id 只把id列取出放到临时表里,select a.* from luntan a,@indextable t where a.id=t.nid

and t.id>@PageLowerBound and t.id<=@PageUpperBound order by t.id

而这句也只从表中取出所需要的记录,而不是所有的记录,结合起来,极大的提高了效率!!

（2）


CREATE PROCEDURE Paging_RowCount


(


@Tables varchar(1000),


@PK varchar(100),


@Sort varchar(200) = NULL,


@PageNumber int = 1,


@PageSize int = 10,


@Fields varchar(1000) = '*',


@Filter varchar(1000) = NULL,


@Group varchar(1000) = NULL)


AS




/*Default Sorting*/


IF @Sort IS NULL OR @Sort = ''


SET @Sort = @PK




/*Find the @PK type*/


DECLARE @SortTable varchar(100)


DECLARE @SortName varchar(100)


DECLARE @strSortColumn varchar(200)


DECLARE @operator char(2)


DECLARE @type varchar(100)


DECLARE @prec int




/*Set sorting variables.*/


IF CHARINDEX('DESC',@Sort)>0


BEGIN


SET @strSortColumn = REPLACE(@Sort, 'DESC', '')


SET @operator = '<='


END


ELSE


BEGIN


IF CHARINDEX('ASC', @Sort) = 0


SET @strSortColumn = REPLACE(@Sort, 'ASC', '')


SET @operator = '>='


END






IF CHARINDEX('.', @strSortColumn) > 0


BEGIN


SET @SortTable = SUBSTRING(@strSortColumn, 0, CHARINDEX('.',@strSortColumn))


SET @SortName = SUBSTRING(@strSortColumn, CHARINDEX('.',@strSortColumn) + 1, LEN(@strSortColumn))


END


ELSE


BEGIN


SET @SortTable = @Tables


SET @SortName = @strSortColumn


END




SELECT @type=t.name, @prec=c.prec


FROM sysobjects o


JOIN syscolumns c on o.id=c.id


JOIN systypes t on c.xusertype=t.xusertype


WHERE o.name = @SortTable AND c.name = @SortName




IF CHARINDEX('char', @type) > 0


SET @type = @type + '(' + CAST(@prec AS varchar) + ')'




DECLARE @strPageSize varchar(50)


DECLARE @strStartRow varchar(50)


DECLARE @strFilter varchar(1000)


DECLARE @strSimpleFilter varchar(1000)


DECLARE @strGroup varchar(1000)




/*Default Page Number*/


IF @PageNumber < 1


SET @PageNumber = 1




/*Set paging variables.*/


SET @strPageSize = CAST(@PageSize AS varchar(50))


SET @strStartRow = CAST(((@PageNumber - 1)*@PageSize + 1) AS varchar(50))




/*Set filter & group variables.*/


IF @Filter IS NOT NULL AND @Filter != ''


BEGIN


SET @strFilter = ' WHERE ' + @Filter + ' '


SET @strSimpleFilter = ' AND ' + @Filter + ' '


END


ELSE


BEGIN


SET @strSimpleFilter = ''


SET @strFilter = ''


END


IF @Group IS NOT NULL AND @Group != ''


SET @strGroup = ' GROUP BY ' + @Group + ' '


ELSE


SET @strGroup = ''




/*Execute dynamic query*/


EXEC(


'


DECLARE @SortColumn ' + @type + '


SET ROWCOUNT ' + @strStartRow + '


SELECT @SortColumn=' + @strSortColumn + ' FROM ' + @Tables + @strFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '


SET ROWCOUNT ' + @strPageSize + '


SELECT ' + @Fields + ' FROM ' + @Tables + ' WHERE ' + @strSortColumn + @operator + ' @SortColumn ' + @strSimpleFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '


'


)


GO