identity_insert---实验性插入大批量数据和分页存储过程
OK,我们首先创建一数据库：data_Test,并在此数据库中创建一表：tb_TestTable
1create database data_Test --创建数据库data_Test
2GO
3use data_Test
4GO
5create table tb_TestTable --创建表
6(
7 id int identity(1,1) primary key,
8 userName nvarchar(20) not null,
9 userPWD nvarchar(20) not null,
10 userEmail nvarchar(40) null
11)
12GO
然后我们在数据表中插入2000000条数据:
1--插入数据
2set identity_insert tb_TestTable on
3declare @count int
4set @count=1
5while @count<=2000000
6begin
7 insert into tb_TestTable(id,userName,userPWD,userEmail) values(@count,'admin','admin888','lli0077@yahoo.com.cn')
8 set @count=@count+1
9end
10set identity_insert tb_TestTable off
我首先写了五个常用存储过程：
1，利用select top 和select not in进行分页，具体代码如下：
1create procedure proc_paged_with_notin --利用select top and select not in
2(
3 @pageIndex int, --页索引
4 @pageSize int --每页记录数
5)
6as
7begin
8 set nocount on;
9 declare @timediff datetime --耗时
10 declare @sql nvarchar(500)
11 select @timediff=Getdate()
12 set @sql='select top '+str(@pageSize)+' * from tb_TestTable where(ID not in(select top '+str(@pageSize*@pageIndex)+' id from tb_TestTable order by ID ASC)) order by ID'
13 execute(@sql) --因select top后不支技直接接参数，所以写成了字符串@sql
14 select datediff(ms,@timediff,GetDate()) as 耗时
15 set nocount off;
16end
2,利用select top 和 select max(列键)
1create procedure proc_paged_with_selectMax --利用select top and select max(列)
2(
3 @pageIndex int, --页索引
4 @pageSize int --页记录数
5)
6as
7begin
8set nocount on;
9 declare @timediff datetime
10 declare @sql nvarchar(500)
11 select @timediff=Getdate()
12 set @sql='select top '+str(@pageSize)+' * From tb_TestTable where(ID>(select max(id) From (select top '+str(@pageSize*@pageIndex)+' id From tb_TestTable order by ID) as TempTable)) order by ID'
13 execute(@sql)
14 select datediff(ms,@timediff,GetDate()) as 耗时
15set nocount off;
16end
复制代码
3,利用select top和中间变量--此方法因网上有人说效果最佳，所以贴出来一同测试
1create procedure proc_paged_with_Midvar --利用ID>最大ID值和中间变量
2(
3 @pageIndex int,
4 @pageSize int
5)
6as
7 declare @count int
8 declare @ID int
9 declare @timediff datetime
10 declare @sql nvarchar(500)
11begin
12set nocount on;
13 select @count=0,@ID=0,@timediff=getdate()
14 select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then ID else @ID end from tb_testTable order by id
15 set @sql='select top '+str(@pageSize)+' * from tb_testTable where ID>'+str(@ID)
16 execute(@sql)
17 select datediff(ms,@timediff,getdate()) as 耗时
18set nocount off;
19end
20
4,利用Row_number() 此方法为SQL server 2005中新的方法,利用Row_number()给数据行加上索引
1create procedure proc_paged_with_Rownumber --利用SQL 2005中的Row_number()
2(
3 @pageIndex int,
4 @pageSize int
5)
6as
7 declare @timediff datetime
8begin
9set nocount on;
10 select @timediff=getdate()
11 select * from (select *,Row_number() over(order by ID asc) as IDRank from tb_testTable) as IDWithRowNumber where IDRank>@pageSize*@pageIndex and IDRank<@pageSize*(@pageIndex+1)
12 select datediff(ms,@timediff,getdate()) as 耗时
13set nocount off;
14end
15
5，利用临时表及Row_number
1create procedure proc_CTE --利用临时表及Row_number
2(
3 @pageIndex int, --页索引
4 @pageSize int --页记录数
5)
6as
7 set nocount on;
8 declare @ctestr nvarchar(400)
9 declare @strSql nvarchar(400)
10 declare @datediff datetime
11begin
12 select @datediff=GetDate()
13 set @ctestr='with Table_CTE as
14 (select ceiling((Row_number() over(order by ID ASC))/'+str(@pageSize)+') as page_num,* from tb_TestTable)';
15 set @strSql=@ctestr+' select * From Table_CTE where page_num='+str(@pageIndex)
16end
17 begin
18 execute sp_executesql @strSql
19 select datediff(ms,@datediff,GetDate())
20 set nocount off;
21 end
22
复制代码
OK,至此，存储过程创建完毕，我们分别在每页10条数据的情况下在第2页，第1000页，第10000页，第100000页，第199999页进行测试，耗时单位：ms 每页测试5次取其平均值
| 存过 | 第2页耗时 | 第1000页耗时 | 第10000页耗时 | 第100000页耗时 | 第199999页耗时 | 效率排行 |
| 1用not in | 0ms | 16ms | 47ms | 475ms | 953ms | 3 |
| 2用select max | 5ms | 16ms | 35ms | 325ms | 623ms | 1 |
| 3中间变量 | 966ms | 970ms | 960ms | 945ms | 933ms | 5 |
| 4row_number | 0ms | 0ms | 34ms | 365ms | 710ms | 2 |
| 4临时表 | 780ms | 796ms | 798ms | 780ms | 805ms | 4 |
测试结果显示：select max >row_number>not in>临时表>中间变量
于是我对效率最高的select max方法用2分法进行了扩展，代码取自互联网，我修改了ASC排序时取不到值的BUG，测
| 2分法 | 156ms | 156ms | 180ms | 470ms | 156ms | 1* |
从测试结果来看，使用2分法确实可以提高效率并使效率更为稳定，我又增加了第159999页的测试，用时仅296ms，效果相当的不错！
下面是2分法使用select max的代码，已相当完善。
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 197
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