On Jun 7, 11:39 pm, Thadeus Burgess <thade...@thadeusb.com> wrote:
> Legacy systems =) The database was already in place as this,
> unfortunately when I migrated from access to postgres I kept the same
> schema as I was under a time crunch to get *something* running.... And
> now it bites me in the butt.
>
> The thing is... I cannot do this
> ``db(db.table.id==3).update(db.table.field=db.table.field+1) ``.
>
> It is not ATOMIC and crashes the application underneath a certain load.
>
> Why does web2py NOT have an autoincrement attribute? Databases are
> kinda designed for this thing =)
>
> Massimo, what reasons do you justify for not having one?
I just never thought one would need more than one autoincrement field.
>
> --
> Thadeus
>
> On Mon, Jun 7, 2010 at 9:56 PM, mr.freeze <nat...@freezable.com> wrote:
> > I'm not even going to ask how you got in this situation :) Could you?:
>
> > 0) Create a patch to Field for an autoincrement field type
> > 1) Create a new table (whopper_temp) on your database with an id field
> > that is NOT set to auto-increment (yet)
> > 2) Copy all records from the table in question to whopper_temp,
> > casting whopper_id to an integer as you go.
> > 3) Rename your source table
> > 4) Rename whopper_temp to the source tables original name
> > 5) Change Field type for whopper_id to your new autoincrement type
>
> > On Jun 7, 8:29 pm, Thadeus Burgess <thade...@thadeusb.com> wrote:
> >> I have a problem.
>
> >> I have this in the database....
>
> >> Field("whopper_id", "string", default=None, unique=True),
>
> >> The thing with whopper_id is it always stores numbers. Said numbers
> >> are anywhere from 20000 to 60000.
>
> >> Also upon entering a new entry, I do the following
>
> >> last_whopper_id = db(db.table.id > 0).select(db.table.whopper_id,
> >> orderby=~db.table.whopper_id, limit=(0,1)).first().whopper_id
> >> db.insert(whopper_id = (int(last_whopper_id) + 1))
>
> >> So I do all this juju just to get the number to autoincrement.
>
> >> The problem is, this structure is bad... first I'm storing integers in
> >> a string field, and then manually incrementing them!!!!
>
> >> I get errors like... IntegrityError: duplicate key value violates
> >> unique constraint "table_whopper_id_key"... when two requests come in
> >> to create a record within miliseconds of each other.
>
> >> Here is where I need some help please.
>
> >> I need to convert this entire field, into an autoincrementing integer
> >> performed by the database, however ALL current whopper_ids must stay
> >> EXACTLY the same.
>
> >> I don't know how to accomplish this with web2py. I know what I want...
>
> >> Field("whopper_id", "integer", unique=True, autoincrement=True)
>
> >> But how do I convert all existing whopper_ids over and keep them the exact
> >> same?
>
> >> Is this even possible with web2py and the DAL?
>
> >> --
> >> Thadeus
