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2分法分页存储过程脚本实例

  • 时间:2021-06-30 17:30 编辑: 来源: 阅读:
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摘要:2分法分页存储过程脚本实例
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
[u]复制代码[/u] 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。
[u]复制代码[/u] 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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