sql 存储过程分页代码 支持亿万庞大数据量

复制代码 代码如下:

create procedure page

@tblname varchar(255), — 表名

@strgetfields varchar(1000) = ‘*’, — 需要返回的列

@fldname varchar(255)=’id’, — 排序的字段名

@pagesize int = 10, — 页尺寸

@pageindex int = 1, — 页码

@docount bit = 0, — 返回记录总数, 非 0 值则返回

@ordertype bit = 0, — 设置排序类型, 非 0 值则降序 0:asc 1:desc

@strwhere varchar(1500) = ”, — 查询条件 (注意: 不要加 where)

@id nvarchar(50)=’id’ –主表的列。。最好是主键

as

declare @strsql varchar(5000) — 主语句

declare @strtmp varchar(110) — 临时变量

declare @strorder varchar(400) — 排序类

if @docount != 0 begin

if @strwhere !=”

set @strsql = ‘select count(*) as total from ‘ + @tblname+ ‘ where ‘+@strwhere

else

set @strsql = ‘select count(*) as total from ‘ + @tblname + ”

end

–以上代码的意思是如果@docount传递过来的不是0，就执行总数统计。以下的所有代码都是@docount为0的情况

else begin

if @ordertype != 0 begin

set @strtmp = ‘<(select min’

set @strorder = ‘ order by ‘ + @fldname +’ desc’

–如果@ordertype不是0，就执行降序，这句很重要！

end

else begin

set @strtmp = ‘>(select max’

set @strorder = ‘ order by ‘ + @fldname +’ asc’

end

if @pageindex = 1 begin

if @strwhere != ”

set @strsql = ‘select top ‘ + str(@pagesize) +’ ‘+@strgetfields+ ‘ from ‘ + @tblname + ‘ where ‘ + @strwhere + ‘ ‘ + @strorder

else

set @strsql = ‘select top ‘ + str(@pagesize) +’ ‘+@strgetfields+ ‘ from ‘+ @tblname + ‘ ‘+ @strorder

–如果是第一页就执行以上代码，这样会加快执行速度

end

else begin

–以下代码赋予了@strsql以真正执行的sql代码

set @strsql = ‘select top ‘ + str(@pagesize) +’ ‘+@strgetfields+ ‘ from ‘

+ @tblname + ‘ where ‘ + @fldname + ‘ ‘ + @strtmp + ‘( ‘+ @id + ‘ ) from (select top ‘ + str((@pageindex-1)*@pagesize) + ‘ ‘+ @fldname + ‘ from ‘ + @tblname + @strorder + ‘) as tbltmp)’+ @strorder

if @strwhere != ”

set @strsql = ‘select top ‘ + str(@pagesize) +’ ‘+@strgetfields+ ‘ from ‘

+ @tblname + ‘ where ‘ + @fldname + ‘ ‘ + @strtmp + ‘(‘

+ @id + ‘) from (select top ‘ + str((@pageindex-1)*@pagesize) + ‘ ‘

+ @fldname + ‘ from ‘ + @tblname + ‘ where ‘ + @strwhere + ‘ ‘

+ @strorder + ‘) as tbltmp) and ‘ + @strwhere + ‘ ‘ + @strorder

end

end

exec (@strsql)