sql函数生成助记码的实例

使用sql函数，如何生成助记码呢？下面就将为您介绍sql函数生成助记码的方法实例，供您参考，希望对您学习sql函数的使用能有所启示。

–助记码匹配库
IF EXISTS(SELECT name
   FROM   sysobjects
   WHERE name = N’hzpy’
   AND   type = ‘U’)
    DROP TABLE hzpy
GO
CREATE TABLE [hzpy] ( [Hz] [char] (2) NOT NULL , [Py] [char] (1) NULL )
CREATE CLUSTERED INDEX [IX_hzpy] ON [hzpy] ( Hz )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘吖’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘阿’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘啊’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘锕’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘嗄’ , ‘S’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘哎’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘哀’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘唉’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘埃’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘挨’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘锿’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘捱’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘皑’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘癌’ , ‘A’ )
INSERT [hzpy] ( [Hz] , [Py] ) VALUES ( ‘嗳’ , ‘A’ )

–定义dbo.getpy函数
IF EXISTS (SELECT *
    FROM   sysobjects
    WHERE name = N’getpy’)
DROP FUNCTION getpy
GO

CREATE FUNCTION getpy(@hz varchar(30))
RETURNS varchar(30)
AS
BEGIN
declare @py varchar(30)
declare @num int
declare @i int
set @py=”
set @num=len(@hz)
set @i=1
while @i<=@num
begin
select @py=@py+py from hzpy where hz = substring(@hz,@i,1)
if @@rowcount=0
   select @py=@py+substring(@hz,@i,1)
select @i=@i+1
end
return @py
END
GO

–例子
select dbo.getpy(‘爱老虎油’)
select dbo.getpy(shengccj),shengccj,* from docdsp

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