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--創(chuàng)建取漢字首字母函數(shù)(第三版) create function [dbo].[f_getpy_V3] ( @col varchar(1000) ) returns varchar(1000) as begin declare @cyc int,@len int,@sql varchar(1000),@char varbinary(20) select @cyc = 1,@len = len(@col),@sql = '' while @cyc <= @len begin select @char = cast(substring(@col, @cyc, 1) as varbinary) declare @maco table (bcode varbinary(20),ecode varbinary(20),letter varchar(10)) insert into @maco select 0XB0A1,0XB0C4,'A' union all select 0XB0C5,0XB2C0,'B' union all select 0XB2C1,0XB4ED,'C' union all select 0XB4EE,0XB6E9,'D' union all select 0XB6EA,0XB7A1,'E' union all select 0XB7A2,0XB8C0,'F' union all select 0XB8C1,0XB9FD,'G' union all select 0XB9FE,0XBBF6,'H' union all select 0XBBF7,0XBFA5,'J' union all select 0XBFA6,0XC0AB,'K' union all select 0XC0AC,0XC2E7,'L' union all select 0XC2E8,0XC4C2,'M' union all select 0XC4C3,0XC5B5,'N' union all select 0XC5B6,0XC5BD,'O' union all select 0XC5BE,0XC6D9,'P' union all select 0XC6DA,0XC8BA,'Q' union all select 0XC8BB,0XC8F5,'R' union all select 0XC8F6,0XCBF9,'S' union all select 0XCBFA,0XCDD9,'T' union all select 0XCDDA,0XCEF3,'W' union all select 0XCEF4,0XD1B8,'X' union all select 0XD1B9,0XD4D0,'Y' union all select 0XD4D1,0XD7F9,'Z' select top 1 @sql=@sql+letter from @maco where @char between bcode and ecode set @cyc = @cyc + 1 end return @sql end go --創(chuàng)建取漢字首字母函數(shù)(第四版) create function [dbo].[f_getpy_V4] ( @col varchar(1000) ) returns varchar(1000) begin declare @cyc int,@len int,@sql varchar(1000),@char varbinary(20) select @cyc = 1,@len = len(@col),@sql = '' while @cyc <= @len begin select @char = cast(substring(@col, @cyc, 1) as varbinary) if @char>=0XB0A1 and @char<=0XB0C4 set @sql=@sql+'A' else if @char>=0XB0C5 and @char<=0XB2C0 set @sql=@sql+'B' else if @char>=0XB2C1 and @char<=0XB4ED set @sql=@sql+'C' else if @char>=0XB4EE and @char<=0XB6E9 set @sql=@sql+'D' else if @char>=0XB6EA and @char<=0XB7A1 set @sql=@sql+'E' else if @char>=0XB7A2 and @char<=0XB8C0 set @sql=@sql+'F' else if @char>=0XB8C1 and @char<=0XB9FD set @sql=@sql+'G' else if @char>=0XB9FE and @char<=0XBBF6 set @sql=@sql+'H' else if @char>=0XBBF7 and @char<=0XBFA5 set @sql=@sql+'J' else if @char>=0XBFA6 and @char<=0XC0AB set @sql=@sql+'K' else if @char>=0XC0AC and @char<=0XC2E7 set @sql=@sql+'L' else if @char>=0XC2E8 and @char<=0XC4C2 set @sql=@sql+'M' else if @char>=0XC4C3 and @char<=0XC5B5 set @sql=@sql+'N' else if @char>=0XC5B6 and @char<=0XC5BD set @sql=@sql+'O' else if @char>=0XC5BE and @char<=0XC6D9 set @sql=@sql+'P' else if @char>=0XC6DA and @char<=0XC8BA set @sql=@sql+'Q' else if @char>=0XC8BB and @char<=0XC8F5 set @sql=@sql+'R' else if @char>=0XC8F6 and @char<=0XCBF9 set @sql=@sql+'S' else if @char>=0XCBFA and @char<=0XCDD9 set @sql=@sql+'T' else if @char>=0XCDDA and @char<=0XCEF3 set @sql=@sql+'W' else if @char>=0XCEF4 and @char<=0XD1B8 set @sql=@sql+'X' else if @char>=0XD1B9 and @char<=0XD4D0 set @sql=@sql+'Y' else if @char>=0XD4D1 and @char<=0XD7F9 set @sql=@sql+'Z' set @cyc = @cyc + 1 end return @sql end go --創(chuàng)建取漢字首字母函數(shù)(第一版) create function [dbo].[f_getpy_V1] (@str nvarchar(4000)) returns nvarchar(4000) as begin declare @word nchar(1),@py nvarchar(4000) set @py='' while len(@str)>0 begin set @word=left(@str,1) set @py = @py+ (case when unicode(@word) between 19968 and 19968+20901 then ( select top 1 py from ( select 'a' as py, N'驁' as word union all select 'B',N'簿' union all select 'C',N'錯' union all select 'D',N'鵽' union all select 'E',N'樲' union all select 'F',N'鰒' union all select 'G',N'腂' union all select 'H',N'夻' union all select 'J',N'攈' union all select 'K',N'穒' union all select 'L',N'鱳' union all select 'M',N'旀' union all select 'N',N'桛' union all select 'O',N'漚' union all select 'P',N'曝' union all select 'Q',N'囕' union all select 'R',N'鶸' union all select 'S',N'蜶' union all select 'T',N'籜' union all select 'W',N'鶩' union all select 'X',N'鑂' union all select 'Y',N'韻' union all select 'Z',N'咗' ) T where word>=@word collate Chinese_PRC_CS_AS_KS_WS order by py asc ) else @word end) set @str=right(@str,len(@str)-1) end return @PY end go --創(chuàng)建取漢字首字母函數(shù)(第二版) create function [dbo].[f_getpy_V2](@Str varchar(500)='') returns varchar(500) as begin declare @strlen int,@return varchar(500),@ii int declare @n int,@c char(1),@chn nchar(1) select @strlen=len(@str),@return='',@ii=0 set @ii=0 while @ii<@strlen begin select @ii=@ii+1,@n=63,@chn=substring(@str,@ii,1) if @chn>'z' select @n = @n +1 ,@c = case chn when @chn then char(@n) else @c end from( select top 27 * from ( select chn = '吖' union all select '八' union all select '嚓' union all select '咑' union all select '妸' union all select '發(fā)' union all select '旮' union all select '鉿' union all select '丌' --because have no 'i' union all select '丌' union all select '咔' union all select '垃' union all select '嘸' union all select '拏' union all select '噢' union all select '妑' union all select '七' union all select '呥' union all select '仨' union all select '他' union all select '屲' --no 'u' union all select '屲' --no 'v' union all select '屲' union all select '夕' union all select '丫' union all select '帀' union all select @chn) as a order by chn COLLATE Chinese_PRC_CI_AS ) as b else set @c='a' set @return=@return+@c end return(@return) end --思路基本是一樣的，但是不同類型導(dǎo)致效率上有差別，這個差別不同環(huán)境測試出來的效果竟然不一樣。 select dbo.f_getpy_V1('我是一個土生土長的中國人') select dbo.f_getpy_V2('我是一個土生土長的中國人') select dbo.f_getpy_V3('我是一個土生土長的中國人') select dbo.f_getpy_V4('我是一個土生土長的中國人') --我現(xiàn)在測試到的開銷百分比是： --1:2:3:4 對應(yīng) 18%:38%:44%:0% --如果你感興趣也可以在本地測試一下，看看執(zhí)行計劃，這4個函數(shù)哪個最高效呢？可以把開銷百分比留言在下面，謝謝！ |
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