一条SqlServer2000的触发器语句转换为mysql5.0的触发器语句

Question

以下是一条SqlServer2000的触发器语句，现希望转换成mysql5.0的触发器语句

该语句主要实现在Product表中插入一条记录时，将主键“Product_id”变成“CP001”、“CP002”.....的形式
,只要是能实现这个功能就行了！！！

CREATE trigger Product_id
on dbo.Product
instead OF insert

as
begin
declare @preStr varchar(10)
declare @tempID varchar(16)
declare @preTl varchar(2)
select * into #temptb from inserted
select @preTl=max(Product_id ) from inserted

set @preStr=@preTl
declare @sequNum int
select @tempID=max(Product_id ) from Product where Product_id like @preStr+'%'
if(@tempID is null)
set @sequNum=1
else
set @sequNum=cast(subString(@tempID,3,3) as int)+1
set @tempID=right('000'+cast(@sequNum as varchar),3)
set @tempID=@preStr+@tempID
update #temptb set Product_id =@tempID
insert into Product select * from #temptb

end

静候各位高手回音~！

Answer 1

create trigger update_product_primary_key before insert on Product for each row begin select count(*) into @count from Product; set new.Product_id =concat('CP',lpad(@count + 1,3,'0')); end;