SQL Server 字段提取拼音首字母

￡神魔★判官ぃ 2021-06-26 16:06 662阅读 0赞

目前工作中遇到一个情况，需要将`SQL Server`中的一个字段提取拼音的首字母，字段由汉字、英文、数字以及“`-`”构成，百度了一堆，找到如下方法，记录一下，以备后用！

首先建立一个函数

--生成拼音首码 
      CREATE  function  fn_GetPy(@str  nvarchar(4000))  
      returns  nvarchar(4000)  
      --WITH ENCRYPTION 
      as  
      begin  
      declare  @intLen int  
      declare  @strRet nvarchar(4000)  
      declare  @temp  nvarchar(100)  
      set  @intLen  =  len(@str)  
      set  @strRet  =  ''  
      while  @intLen  >  0  
      begin  
      set  @temp  =  ''  
      select  @temp  =  case    
      when  substring(@str,@intLen,1)  >=  '帀'  then  'Z'  
      when  substring(@str,@intLen,1)  >=  '丫'  then  'Y'  
      when  substring(@str,@intLen,1)  >=  '夕'  then  'X'  
      when  substring(@str,@intLen,1)  >=  '屲'  then  'W'  
      when  substring(@str,@intLen,1)  >=  '他'  then  'T'  
      when  substring(@str,@intLen,1)  >=  '仨'  then  'S'  
      when  substring(@str,@intLen,1)  >=  '呥'  then  'R'  
      when  substring(@str,@intLen,1)  >=  '七'  then  'Q'  
      when  substring(@str,@intLen,1)  >=  '妑'  then  'P'  
      when  substring(@str,@intLen,1)  >=  '噢'  then  'O'  
      when  substring(@str,@intLen,1)  >=  '拏'  then  'N'  
      when  substring(@str,@intLen,1)  >=  '嘸'  then  'M'  
      when  substring(@str,@intLen,1)  >=  '垃'  then  'L'  
      when  substring(@str,@intLen,1)  >=  '咔'  then  'K'  
      when  substring(@str,@intLen,1)  >=  '丌'  then    'J'  
      when  substring(@str,@intLen,1)  >=  '铪'  then  'H'  
      when  substring(@str,@intLen,1)  >=  '旮'  then  'G'  
      when  substring(@str,@intLen,1)  >=  '发'  then  'F'  
      when  substring(@str,@intLen,1)  >=  '妸'  then  'E'  
      when  substring(@str,@intLen,1)  >=  '咑'  then  'D'  
      when  substring(@str,@intLen,1)  >=  '嚓'  then  'C'  
      when  substring(@str,@intLen,1)  >=  '八'  then  'B'  
      when  substring(@str,@intLen,1)  >=  '吖'  then  'A'  
      else  rtrim(ltrim(substring(@str,@intLen,1)))  
      end  
      --对于汉字特殊字符，不生成拼音码 
      if  (ascii(@temp)>127)  set  @temp  =  ''  
      --对于英文中小括号，不生成拼音码 
      if  @temp  =  '('  or  @temp  =  ')'  set  @temp  =  ''  
      select  @strRet  =  @temp  +  @strRet  
      set  @intLen  =  @intLen  -  1  
      end  
      return  lower(@strRet)  
      end

执行语句

SELECT    需转换中文字段, dbo.fn_GetPy(中文字段) AS 列别名
    FROM        表名称