On Thu, 1 Feb 2007, John Siracusa wrote:
> Maybe you should share that information with the database... :)
Ha :). I can think of 3 different scenarios:
1) Two columns of a table form a combined unique key, but neither
of them can be defined UNIQUE().
2) You have a "unique key" that spans several tables:
CREATE TABLE bars (
id INTEGER AUTO_INCREMENT PRIMARY KEY NOT NULL,
string VARCHAR(255),
UNIQUE(string)
)Type=InnoDB;
CREATE TABLE foos (
id INTEGER AUTO_INCREMENT PRIMARY KEY NOT NULL,
bar_id INTEGER,
UNIQUE(bar_id),
FOREIGN KEY(bar_id) REFERENCES bars(id),
INDEX(bar_id)
)Type=InnoDB;
my $foo = Rosetest::Foo->new(bar => { string => "moo!" });
$foo->load(speculative => 1); # Error
$foo->save();
3) The application isn't at liberty to change the db and must
work with a crappy legacy schema.
-- Mike
Mike Schilli
[EMAIL PROTECTED]
> > It's something that I'm running into quite frequently:
> > I want to find out whether a matching record exists or not, and
> > load it if so. I guess it comes from using Class::DBI previously,
> > which allowed calls like
> >
> > my $cd = Music::CD->find_or_create({ artist => 'U2', title => 'Boy' });
> >
> > Just speculating: Could this be added to the new find() method?
>
> It's something entirely different. The only thing in common is the word
> "find". There's already a load_or_save() Helper method, but with the word
> "load" in there, it of course needs a unique key. I think I'd have to see
> some more requests and usage examples before adding something like the
> db_find_or_create() method posted earlier. Right now, it seems very odd to
> me. What does everyone else think?
>
> -John
>
>
>
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Get stuff done quickly with pre-integrated technology to make your job easier.
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