2分法分页存储过程脚本实例

2022-05-24 0 673

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

复制代码 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。

复制代码 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

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