2分法分页存储过程脚本实例
编程学习 2021-07-05 13:42www.dzhlxh.cn编程入门
目前针对大数据量的数据显示(100w以上~1000w级别)能找到的最好的分页存储过程就是2分法的存储过程,它避免了以往的分页后面的越来越慢的问题,但是我发现目前网上的能找到的分页存储过程很多是网络推广网站推广转载的,有很多bug,不能直接使用,我就修正了一个,方便大家直接使用
需要说明的是:这个存储过程参数比较多,我再实际使用中又在外面单独写了一个类,页面调用直接调用封装的类,方法有很多,主要是思路,大家可以参考下。
代码修改集中在类似
代码如下:
if @Sort=0
set @strTmp = @strTmp + '<(select min('
else
set @strTmp = @strTmp + '>(select max('
另外94行主要是配合我自己写的类,显示记录条数分页数等信息,如果不需要就去掉。
代码如下:
1ALTER PROCEDURE [dbo].[proc_ListPage]
2(
3 @tblName nvarchar(200), ----要显示的表或多个表的连接
4 @fldName nvarchar(500) = '*', ----要显示的字段列表
5 @pageSize int = 10, ----每页显示的记录个数
6 @page int = 1, ----要显示那一页的记录
7 @fldSort nvarchar(200) = null, ----排序字段列表或条件
8 @Sort bit = 0, ----排序方法,0为升序,1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)--程序传参如:' SortA Asc,SortB Desc,SortC ')
9 @strCondition nvarchar(1000) = null, ----查询条件,不需where
10 @ID nvarchar(150), ----主表的主键
11 @Dist bit = 0, ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
12 @pageCount int = 1 output, ----查询结果分页后的总页数
13 @Counts int = 1 output ----查询到的记录数
14 )
15 AS
16 SET NOCOUNT ON
17 Declare @sqlTmp nvarchar(1000) ----存放动态生成的SQL语句
18 Declare @strTmp nvarchar(1000) ----存放取得查询结果总数的查询语句
19 Declare @strID nvarchar(1000) ----存放取得查询开头或结尾ID的查询语句
20
21 Declare @strSortType nvarchar(10) ----数据排序规则A
22 Declare @strFSortType nvarchar(10) ----数据排序规则B
23
24 Declare @SqlSelect nvarchar(50) ----对含有DISTINCT的查询进行SQL构造
25 Declare @SqlCounts nvarchar(50) ----对含有DISTINCT的总数查询进行SQL构造
26
27
28 if @Dist = 0
29 begin
30 set @SqlSelect = 'select '
31 set @SqlCounts = 'Count(0)'
32 end
33 else
34 begin
35 set @SqlSelect = 'select distinct '
36 set @SqlCounts = 'Count(DISTINCT '+@ID+')'
37 end
38
39
40 if @Sort=0
41 begin
42 set @strFSortType=' ASC '
43 set @strSortType=' DESC '
44 end
45 else
46 begin
47 set @strFSortType=' DESC '
48 set @strSortType=' ASC '
49 end
50
51
52
53 --------生成查询语句--------
54 --此处@strTmp为取得查询结果数量的语句
55 if @strCondition is null or @strCondition='' --没有设置显示条件
56 begin
57 set @sqlTmp = @fldName + ' From ' + @tblName
58 set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName
59 set @strID = ' From ' + @tblName
60 end
61 else
62 begin
63 set @sqlTmp = + @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition
64 set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition
65 set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition
66 end
67
68 ----取得查询结果总数量-----
69 exec sp_executesql @strTmp,N'@Counts int out ',@Counts out
70 declare @tmpCounts int
71 if @Counts = 0
72 set @tmpCounts = 1
73 else
74 set @tmpCounts = @Counts
75
76 --取得分页总数
77 set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize
78
79 /**//**当前页大于总页数 取最后一页**/
80 if @page>@pageCount
81 set @page=@pageCount
82
83 --/*-----数据分页2分处理-------*/
84 declare @pageIndex int --总数/页大小
85 declare @lastcount int --总数%页大小
86
87 set @pageIndex = @tmpCounts/@pageSize
88 set @lastcount = @tmpCounts%@pageSize
89 if @lastcount > 0
90 set @pageIndex = @pageIndex + 1
91 else
92 set @lastcount = @pagesize
93
94 --为配合显示
95 set nocount off
96 select @page curpage,@pageSize pagesize,@pageCount countpage,@tmpCounts [Rowcount]
97 set nocount on
98
99 --//***显示分页
100 if @strCondition is null or @strCondition='' --没有设置显示条件
101 begin
102 if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理
103 begin
104 if @page=1
105 set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(40))+' '+ @fldName+' from '+@tblName
106 +' order by '+ @fldSort +' '+ @strFSortType
107 else
108 begin
109 set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(40))+' '+ @fldName+' from '+@tblName
110 +' where '+@ID
111 if @Sort=0
112 set @strTmp = @strTmp + '>(select max('
113 else
114 set @strTmp = @strTmp + '<(select min('
115 set @strTmp = @strTmp + @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
116 +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
117 +' order by '+ @fldSort +' '+ @strFSortType
118 end
119 end
120 else
121
122 begin
123 set @page = @pageIndex-@page+1 --后半部分数据处理
124 if @page <= 1 --最后一页数据显示
125 set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(40))+' '+ @fldName+' from '+@tblName
126 +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
127 else
128 begin
129 set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(40))+' '+ @fldName+' from '+@tblName
130 +' where '+@ID
131 if @Sort=0
132 set @strTmp=@strTmp+' <(select min('
133 else
134 set @strTmp=@strTmp+' >(select max('
135 set @strTmp=@strTmp+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
136 +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
137 +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
138 end
139 end
140
141 end
142
143 else --有查询条件
144 begin
145 if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理
146 begin
147 if @page=1
148 set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(40))+' '+ @fldName+' from '+@tblName
149 +' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType
150 else
151 begin
152 set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(40))+' '+ @fldName+' from '+@tblName
153 +' where '+@ID
154 if @Sort=0
155 set @strTmp = @strTmp + '>(select max('
156 else
157 set @strTmp = @strTmp + '<(select min('
158
159 set @strTmp = @strTmp + @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
160 +' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
161 +' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType
162 end
163 end
164 else
165 begin
166 set @page = @pageIndex-@page+1 --后半部分数据处理
167 if @page <= 1 --最后一页数据显示
168 set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(40))+' '+ @fldName+' from '+@tblName
169 +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
170 else
171 begin
172 set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(40))+' '+ @fldName+' from '+@tblName
173 +' where '+@ID
174 if @Sort=0
175 set @strTmp = @strTmp + '<(select min('
176 else
177 set @strTmp = @strTmp + '>(select max('
178 set @strTmp = @strTmp + @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
179 +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
180 +' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
181 end
182 end
183
184 end
185
186 ------返回查询结果-----
187 SET NOCOUNT off
188 exec sp_executesql @strTmp
189 print @strTmp