利用存储过程实现分页

原文地址:http://dzsnowdrop.blog.163.com/blog/static/164932582201062792841678/

存储过程实现分页

 1 -------------------------------------------------------以下代码为存储过程代码
 2 
 3 CREATE procedure   News_Class
 4 
 5 --资讯新闻百万级分页
 6 
 7 (
 8 
 9 @StrWhere     varchar(100),--条件
10 
11 @PageSize     int,         --页面大小
12 
13 @PageIndex     int        --页面索引
14 
15 )
16 
17 AS
18 
19 declare   @strSQL         varchar(2000)     -- 主语句
20 
21 declare   @strCountSQL   varchar(2000)     -- 总记录主语句
22 
23 declare   @strTmp         varchar(1000)     -- 临时变量
24 
25 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
26 
27 if @StrWhere<>''
28 
29    Begin
30 
31   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"
32 
33    set @strCountSQL="select count(ID) as countx from Tb_News Where "+@StrWhere+" "
34 
35    End
36 
37 else
38 
39    Begin
40 
41    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"
42 
43    set @strCountSQL="select count(ID) as countx from Tb_News "
44 
45    End
46 
47 if @PageIndex = 1
48 
49    if @StrWhere<>''
50 
51        Begin
52 
53        Set @strSQL=@strTmp +" Where "+@StrWhere+" order by ID desc"
54 
55        End
56 
57    else
58 
59        Begin
60 
61        Set @strSQL=@strTmp +" order by ID desc"
62 
63        End
64 
65 exec (@strSQL)
66 
67 exec (@strCountSQL)
68 
69 GO
代码

 

分页的几种方案,及思路

分页方案一:(利用Not InSELECT TOP分页)

语句形式:

 1 SELECT TOP 10 *
 2 
 3 FROM TestTable
 4 
 5 WHERE (ID NOT IN
 6 
 7           (SELECT TOP 20 id
 8 
 9          FROM TestTable
10 
11          ORDER BY id))
12 
13 ORDER BY ID
14 
15 SELECT TOP 页大小 *
16 
17 FROM TestTable
18 
19 WHERE (ID NOT IN
20 
21           (SELECT TOP 页大小*页数 id
22 
23          FROM24 
25          ORDER BY id))
26 
27 ORDER BY ID
代码

 

-------------------------------------

分页方案二:(利用ID大于多少和SELECT TOP分页)

语句形式:

 1 SELECT TOP 10 *
 2 
 3 FROM TestTable
 4 
 5 WHERE (ID >
 6 
 7           (SELECT MAX(id)
 8 
 9          FROM (SELECT TOP 20 id
10 
11                  FROM TestTable
12 
13                  ORDER BY id) AS T))
14 
15 ORDER BY ID
16 
17 SELECT TOP 页大小 *
18 
19 FROM TestTable
20 
21 WHERE (ID >
22 
23           (SELECT MAX(id)
24 
25          FROM (SELECT TOP 页大小*页数 id
26 
27                  FROM28 
29                  ORDER BY id) AS T))
30 
31 ORDER BY ID
代码

 

-------------------------------------

分页方案三:(利用SQL的游标存储过程分页)

 1 create procedure XiaoZhengGe
 2 
 3 @sqlstr nvarchar(4000), --查询字符串
 4 
 5 @currentpage int, --第N页
 6 
 7 @pagesize int --每页行数
 8 
 9 as
10 
11 set nocount on
12 
13 declare @P1 int, --P1是游标的id
14 
15 @rowcount int
16 
17 exec sp_cursoropen @P1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output
18 
19 select ceiling(1.0*@rowcount/@pagesize) as 总页数--,@rowcount as 总行数,@currentpage as 当前页
20 
21 set @currentpage=(@currentpage-1)*@pagesize+1
22 
23 exec sp_cursorfetch @P1,16,@currentpage,@pagesize
24 
25 exec sp_cursorclose @P1
26 
27 set nocount off
代码

 

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 InSELECT 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

posted @ 2013-09-28 22:30  细品人生  阅读(262)  评论(0编辑  收藏  举报