SQL Server 自动生成字符串主键 流水号

--根据给定的编码比如Emp，生成一个字符串类型的流水号,如：20110102Emp0001

--建立表

CREATE TABLE
PrimKey(

cDate datetime
not null,

cChar varchar
(3) not null,

cCount int
not null

)

--创建主键的存储过程

Create Proc
GetPrimKey

@char varchar(3),

@res nvarchar(15) output

As

Begin

declare
@count int

begin
try

select
@count=isnull(cCount,0) from PrimKey where convert(varchar(8),cDate,112)=Convert(nvarchar(8),getdate(),112) and cChar=@char

set
@count=isnull(@count,0);

if
(@count>0)

begin

Update
PrimKey set cCount=@count+1
where convert(varchar(8),cDate,112)=Convert(nvarchar(8),getdate(),112) and cChar=@char

end

if(@count<=0)

begin

Insert into PrimKey values(Convert(nvarchar(10),getdate(),21),@char,1);

end

set @res =Convert(nvarchar(8),getdate(),112)+@char+right('00000000'+convert(varchar(5),@count+1),4)

end
try

begin
catch

set @res='One Error';

end
catch

End

--测试调用

declare
@res nvarchar(20)

exec
GetPrimKey 'Emp',@res output

print
@res

--Create by Ranen