SQL自增主键函数

自动生成编码的主键函数

比如

CRM00001

CRM00002

CRM00003

 

 

create   table   IntKey(KeyChar   char(10)) 

go 

create   function   GetKey() 

returns   char(10) 

as 

begin 

declare   @KeyValue   int 

declare   @KeyReturn   varchar(20) 

set   @KeyValue   =   cast(isnull((select   max(KeyChar)   from   IntKey),0)   as   int)   +   1 

set   @KeyReturn   =   '000000000 '   +   ltrim(str(@KeyValue)) 

return   right(@KeyReturn,10) 

end 



go 



declare   @i   int 

set   @i   =   0 

while   @i   <   100 

begin 

insert   into   IntKey(KeyChar) 

select   dbo.GetKey() 

set   @i   =   @i   +   1 

end 

select   *   from   IntKey 

go 

drop   function   GetKey 

drop   table   IntKey