根據漢字的首字母生產拼音碼進行查詢

主要是在sql中實現

use

[xpos_refer_database]go
/****** object:  userdefinedfunction [dbo].[getletter]    script date: 04/07/2012 09:22:25 *****
*/set ansi_nulls on
goset quoted_identifier on
goalter
function
[dbo
].[getletter
](@str
nvarchar(4000),@type
int) 
returns
nvarchar(4000) 
--with   encryption 
asbegin
declare
@intlen
int--
長度declare
@strret
nvarchar(4000)--
返回值declare
@temp
nvarchar(100) --
臨時變數
set@intlen
=len(@str) 
set@strret=''
declare
@iint
--臨時變數
select@i=
1
while (@intlen
>
0and
@type
>
0) 
begin
set@temp=''
select
@temp
=case
when
substring(@str,@i,1) >='
帀 'then'z
'when
substring(@str,@i,1) >='
丫 'then'y
'when
substring(@str,@i,1) >='
夕 'then'x
'when
substring(@str,@i,1) >='
屲 'then'w
'when
substring(@str,@i,1) >='
他 'then't
'when
substring(@str,@i,1) >='
仨 'then's
'when
substring(@str,@i,1) >='
呥 'then'r
'when
substring(@str,@i,1) >='
七 'then'q
'when
substring(@str,@i,1) >='
妑 'then'p
'when
substring(@str,@i,1) >='
噢 'then'o
'when
substring(@str,@i,1) >='
拏 'then'n
'when
substring(@str,@i,1) >='
嘸 'then'm
'when
substring(@str,@i,1) >='
垃 'then'l
'when
substring(@str,@i,1) >='
咔 'then'k
'when
substring(@str,@i,1) >='
丌 'then'j
'when
substring(@str,@i,1) >='
鉿 'then'h
'when
substring(@str,@i,1) >='
旮 'then'g
'when
substring(@str,@i,1) >='
發 'then'f
'when
substring(@str,@i,1) >='
妸 'then'e
'when
substring(@str,@i,1) >='
咑 'then'd
'when
substring(@str,@i,1) >='
嚓 'then'c
'when
substring(@str,@i,1) >='
八 'then'b
'when
substring(@str,@i,1) >='
吖 'then'a
'else
rtrim(ltrim(substring(@str,@i,1))) 
end--對於漢字特殊字元，不生成拼音碼 
if (ascii(@temp)>
127) set
@temp='
'--對於英文中小括號，不生成拼音碼 
if@temp='
('or@temp='
)'set@temp='
'select
@strret
=@strret
+@temp
set@intlen
=@intlen
-1
if@type
<=
10set
@type
=@type
-1
set@i=
@i+1
end--
while
return
lower(@strret) 
end

查詢的sql語句：

select

distinct d_city as 城市,upper(dbo.getletter(d_city,1)) as 拼音碼 from ref_addr3 order
byupper(dbo.getletter(d_city,1))

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