标签:des style blog http color io ar div cti
转自:http://www.dotblogs.com.tw/rachen/archive/2008/10/07/5611.aspx
函數一.產生 Like 比對用字串
create function fn_get_fuzzy_str( @instr nvarchar(256) ) returns nvarchar(513) as begin /*依據傳入字串補上%符號*/ /* declare @instr nvarchar(256); set @instr = N‘樹林國民小學‘; */ declare @outstr nvarchar(513) if isnull(@instr,‘‘) = ‘‘ begin set @outstr = ‘‘; end else begin declare @i int; set @i = 1; set @outstr = ‘%‘; while @i <= len(@instr) begin set @outstr = @outstr + substring(@instr,@i,1) + ‘%‘; set @i = @i + 1; end end return @outstr; end
函數二.查詢函數
create function fn_str_fuzzy_qry( @src_str nvarchar(256) , @match_str nvarchar(256) , @setp int ) returns int as begin /*字串相似度比對 結果直越大相似度越高*/ /* declare @src_str nvarchar(256); --比對來源 declare @match_str nvarchar(256); --比對字串 declare @setp int; --每次步減幾個字 */ declare @fuzzy_str nvarchar(513); declare @like_str nvarchar(513); set @fuzzy_str = dbo.fn_get_fuzzy_str(@match_str); return case when @src_str like @fuzzy_str then 4000 + 1000 - len(@src_str) when ( len(@fuzzy_str) - @setp*2*1 >= 5 ) and @src_str like left(@fuzzy_str,len(@fuzzy_str) - @setp*2*1) then 3000 + 1000 - len(@src_str) when ( len(@fuzzy_str) - @setp*2*2 >= 5 ) and @src_str like left(@fuzzy_str,len(@fuzzy_str) - @setp*2*2) then 2000 + 1000 - len(@src_str) when ( len(@fuzzy_str) - @setp*2*3 >= 5 ) and @src_str like left(@fuzzy_str,len(@fuzzy_str) - @setp*2*3) then 1000 + 1000 - len(@src_str) else 0 end end
應用方式
select school_name , ...... from bas_info where dbo.fn_str_fuzzy_qry(school_name,N‘樹林國小‘,1) > 0 order by dbo.fn_str_fuzzy_qry(school_name,N‘樹林國小‘,1) desc
标签:des style blog http color io ar div cti
原文地址:http://www.cnblogs.com/yyjj/p/3944508.html