存储过程实现分页 (载至网上) ——~——
存储过程实现分页
-------------------------------------------------------以下代码为存储过程代码
CREATE procedure News_Class
--资讯新闻百万级分页
(
@StrWhere varchar(100),--条件
@PageSize int, --页面大小
@PageIndex int --页面索引
)
AS
declare @strSQL varchar(2000) -- 主语句
declare @strCountSQL varchar(2000) -- 总记录主语句
declare @strTmp varchar(1000) -- 临时变量
Set @strTmp =" Select top " + str(@PageSize) + " Title,AddTime from Tb_News " --此处注意，需几个字段读几个字段
if @StrWhere<>''
Begin
Set @strSQL=@strTmp + " where ID < (select min(ID) from (select top " + str((@PageIndex-1)*@PageSize)+" ID from Tb_News Where "+@StrWhere+" order by ID desc) as tblTmp ) and "+@StrWhere+" order by ID desc"
set @strCountSQL="select count(ID) as countx from Tb_News Where "+@StrWhere+" "
End
else
Begin
Set @strSQL=@strTmp + " where ID < (select min(ID) from (select top " + str((@PageIndex-1)*@PageSize)+" ID from Tb_News order by ID desc) as tblTmp ) order by ID desc"
set @strCountSQL="select count(ID) as countx from Tb_News "
End
if @PageIndex = 1
if @StrWhere<>''
Begin
Set @strSQL=@strTmp +" Where "+@StrWhere+" order by ID desc"
End
else
Begin
Set @strSQL=@strTmp +" order by ID desc"
End
exec (@strSQL)
exec (@strCountSQL)
GO
分页的几种方案，及思路
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：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
