明志唯新

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 @indextable table(id int identity(1,1),nid int)
    declare @PageLowerBound int
    declare @PageUpperBound int
    set @PageLowerBound=(@pageindex-1)*@pagesize
    set @PageUpperBound=@PageLowerBound+@pagesize
    set rowcount @PageUpperBound
    insert into @indextable(nid) select id from luntan where this_id=@this_id order by reply_time desc
    select a.* from luntan a,@indextable t where a.id=t.nid
    and t.id>@PageLowerBound and t.id<=@PageUpperBound order by t.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! 妙啊,真的妙!

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