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

--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 @cursor
fetch next from @cursor into @id,@UserName;
while @@FETCH_STATUS=0
begin
begin
update T_user set UserName=(SELECT [dbo].[fn_GetPy](@UserName)) where id=@id
end
fetch next from @cursor into @id,@UserName;
end
close @cursor
deallocate @cursor