create function getPY(@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) 
    --如果非汉字字符，返回原字符 
    set @PY=@PY+(case when unicode(@word) between 19968 and 19968+20901 
    then (select top 1 PY from ( 
    select 'A' as PY,N'骜' as word 
    union all select 'B',N'簿' 
    union all select 'C',N'错' 
    union all select 'D',N'鵽' 
    union all select 'E',N'樲' 
    union all select 'F',N'鳆' 
    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'沤' 
    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'箨' 
    union all select 'W',N'鹜' 
    union all select 'X',N'鑂' 
    union all select 'Y',N'韵' 
    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

select dbo.GetPY('李连杰')