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SQL大数据量分页存储过程效率测试

  1--/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/

  2--/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/

  3--/*----- 对数据进行了2分处理使查询前半部分数据与查询后半部分数据性能相同 -------*/

  4

  5alter PROCEDURE proc_paged_2part_selectMax

  6(

  7@tblName     nvarchar(200),        ----要显示的表或多个表的连接

  8@fldName     nvarchar(500) = '*',    ----要显示的字段列表

  9@pageSize    int = 10,        ----每页显示的记录个数

  10@page        int = 1,        ----要显示那一页的记录

  11@fldSort    nvarchar(200) = null,    ----排序字段列表或条件

  12@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 ')

  13@strCondition    nvarchar(1000) = null,    ----查询条件,不需where

  14@ID        nvarchar(150),        ----主表的主键

  15@Dist                 bit = 0,           ----是否添加查询字段的 DISTINCT 默认0不添加/1添加

  16@pageCount    int = 1 output,            ----查询结果分页后的总页数

  17@Counts    int = 1 output                ----查询到的记录数

  18)

  19AS

  20SET NOCOUNT ON

  21Declare @sqlTmp nvarchar(1000)        ----存放动态生成的SQL语句

  22Declare @strTmp nvarchar(1000)        ----存放取得查询结果总数的查询语句

  23Declare @strID     nvarchar(1000)        ----存放取得查询开头或结尾ID的查询语句

  24

  25Declare @strSortType nvarchar(10)    ----数据排序规则A

  26Declare @strFSortType nvarchar(10)    ----数据排序规则B

  27

  28Declare @SqlSelect nvarchar(50)         ----对含有DISTINCT的查询进行SQL构造

  29Declare @SqlCounts nvarchar(50)          ----对含有DISTINCT的总数查询进行SQL构造

  30

  31declare @timediff datetime  --耗时测试时间差

  32select @timediff=getdate()

  33

  34if @Dist  = 0

  35begin

  36    set @SqlSelect = 'select '

  37    set @SqlCounts = 'Count(*)'

  38end

  39else

  40begin

  41    set @SqlSelect = 'select distinct '

  42    set @SqlCounts = 'Count(DISTINCT '+@ID+')'

  43end

  44

  45

  46if @Sort=0

  47begin

  48    set @strFSortType=' ASC '

  49    set @strSortType=' DESC '

  50end

  51else

  52begin

  53    set @strFSortType=' DESC '

  54    set @strSortType=' ASC '

  55end

  56

  57

  58

  59--------生成查询语句--------

  60--此处@strTmp为取得查询结果数量的语句

  61if @strCondition is null or @strCondition=''     --没有设置显示条件

  62begin

  63    set @sqlTmp =  @fldName + ' From ' + @tblName

  64    set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName

  65    set @strID = ' From ' + @tblName

  66end

  67else

  68begin

  69    set @sqlTmp = + @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition

  70    set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition

  71    set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition

  72end

  73

  74----取得查询结果总数量-----

  75exec sp_executesql @strTmp,N'@Counts int out ',@Counts out

  76declare @tmpCounts int

  77if @Counts = 0

  78    set @tmpCounts = 1

  79else

  80    set @tmpCounts = @Counts

  81

  82    --取得分页总数

  83    set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize

  84

  85    /**//**//**//**当前页大于总页数 取最后一页**/

  86    if @page>@pageCount

  87        set @page=@pageCount

  88

  89    --/*-----数据分页2分处理-------*/

  90    declare @pageIndex int --总数/页大小

  91    declare @lastcount int --总数%页大小

  92

  93    set @pageIndex = @tmpCounts/@pageSize

  94    set @lastcount = @tmpCounts%@pageSize

  95    if @lastcount > 0

  96        set @pageIndex = @pageIndex + 1

  97    else

  98        set @lastcount = @pagesize

  99

  100    --//***显示分页

  101    if @strCondition is null or @strCondition=''     --没有设置显示条件

  102    begin

  103        if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理

  104            begin

  105                if @page=1

  106                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  107                        +' order by '+ @fldSort +' '+ @strFSortType

  108                else

  109                begin

  110                    if @Sort=1

  111                    begin

  112                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  113                        +' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

  114                        +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

  115                        +' order by '+ @fldSort +' '+ @strFSortType

  116                    end

  117                    else

  118                    begin

  119                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  120                        +' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

  121                        +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

  122                        +' order by '+ @fldSort +' '+ @strFSortType

  123                    end

  124                end

  125            end

  126        else

  127            begin

  128            set @page = @pageIndex-@page+1 --后半部分数据处理

  129                if @page <= 1 --最后一页数据显示

  130                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  131                        +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

  132                else

  133                    if @Sort=1

  134                    begin

  135                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  136                        +' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

  137                        +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

  138                        +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

  139                    end

  140                    else

  141                    begin

  142                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  143                        +' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

  144                        +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

  145                        +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

  146                    end

  147            end

  148    end

  149

  150    else --有查询条件

  151    begin

  152        if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理

  153        begin

  154                if @page=1

  155                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  156                        +' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType

  157                else if(@Sort=1)

  158                begin

  159                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  160                        +' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

  161                        +' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

  162                        +' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType

  163                end

  164                else

  165                begin

  166                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  167                        +' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

  168                        +' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

  169                        +' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType

  170                end

  171        end

  172        else

  173        begin

  174            set @page = @pageIndex-@page+1 --后半部分数据处理

  175            if @page <= 1 --最后一页数据显示

  176                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  177                        +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

  178            else if(@Sort=1)

  179                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  180                        +' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

  181                        +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

  182                        +' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

  183            else

  184                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

  185                        +' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

  186                        +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

  187                        +' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

  188        end

  189    end

  190

  191------返回查询结果-----

  192exec sp_executesql @strTmp

  193select datediff(ms,@timediff,getdate()) as 耗时

  194--print @strTmp

  195SET NOCOUNT OFF

  196GO

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