SQL将用户表中已存在的数据所有姓名（汉字）转换为拼音首字母

实现方法：

--函数

Create function [dbo].[fn_GetPy](@str nvarchar(4000))

returns nvarchar(4000) --用于加密 --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

declare @id int; declare @UserName varchar(100); declare @cursor cursor;--游标set @cursor=cursor for select id,UserName from T_user;open @cursorfetch next from @cursor into @id,@UserName;while @@FETCH_STATUS=0begin begin update T_user set UserName=(SELECT [dbo].[fn_GetPy](@UserName)) where id=@id end fetch next from @cursor into @id,@UserName;endclose @cursordeallocate @cursor