Sqlserver function for quickly generating the first letter of a Chinese character (Classic)

The Code is as follows:
Copy codeThe Code is as follows:
USE [tempdb]
GO
/***** Object: UserDefinedFunction [dbo]. [fun_getPY] Script Date: 05/23/2012 18:03:45 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/*
Obtain the first Pinyin of Chinese Characters
If it is a non-Chinese Character
*/
ALTER function [dbo]. [fun_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)
-- If it is not a Chinese character, the original character is returned.
Set @ PY = @ PY + (case when unicode (@ word) between 19968 and 19968 + 20901
Then (
Select top 1 PY
From
(
Select 'A' as PY, n' comment 'as word
Union all select 'B', n''
Union all select 'C', n' then'
Union all select 'D', N 'region'
Union all select 'E', n' then'
Union all select 'F', n' then'
Union all select 'G', n' then'
Union all select 'h', N 'hour'
Union all select 'J', n' else'
Union all select 'k', n' then'
Union all select 'l', n' then'
Union all select 'M', n' then'
Union all select 'n', n' then'
Union all select 'O', n' then'
Union all select 'P', n' exposure'
Union all select 'Q', n' then'
Union all select 'R', N 'region'
Union all select's ', N 'region'
Union all select 'T', n' then'
Union all select 'w', N 'hangzhou'
Union all select 'x', n' then'
Union all select 'y', n' then'
Union all select 'Z', n' else'
) 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 upper (@ PY)
End

The call is as follows:
Copy codeThe Code is as follows:
Select dbo. [fun_getPY] ('China') first fight

Result:
ZGR