From: | John R Pierce <pierce(at)hogranch(dot)com> |
---|---|
To: | Andre Lopes <lopes80andre(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: How to auto-increment? |
Date: | 2009-12-02 23:09:09 |
Message-ID: | 4B16F395.5000405@hogranch.com |
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Thread: | |
Lists: | pgsql-general |
Andre Lopes wrote:
> Hi,
>
> I have a table like this:
>
> id_product
> id_increment
>
> and I need to increment values in id_increment like this
>
> prod_1
> 1
>
> prod_1
> 2
>
> prod_1
> 3
>
> prod_2
> 1
>
> Wich is the best way to do this? Using a trigger? Where can I find
> examples of plpgsql doing this?
offhand, I'd have another table that has (id_product primary key,
next_increment integer), and use it to populate your id_increment
fields, bumping the next_increment each time you fetch it.
I assume its OK if there are missing increment values, like if you
delete a product/increment from your table, or if in the middle of
inserting a new one, there's a transaction rollback for some reason?
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