SQL server自定义函数实例

create function dbo.t_bh (@str varchar(20))

returns varchar(20)

as

begin

declare @bh varchar(20),@length int,@i int

set @length=12-LEN(@str)

if LEN(@str)<12

begin

set @i=0

while @i<@length

begin

set @str='0'+@str

set @i=@i+1

end

return @str

end

else if isnull(@str,0)=0

begin

set @str='000000000000'

return @str

end

else

begin

return @str

end

return @str

end

--select dbo.t_bh('000022')