On 12/5/06 11:08 AM, Michael Lackhoff wrote:
> On 5 Dec 2006 at 10:32, John Siracusa wrote:
>>>> sub generate_invoice_number
>>>> {
>>>> my $class = shift;
>>>> my $db = My::DB->new; # Rose::DB subclass
>>>
>>> Why not just use the default here?
>>
>> What default?
>
> The one that is inherited from my common base class (I followed the tutorial
> [1] except that I don't have separate manager classes) through init_db.
Ah, I didn't know you had combined the manager methods into your
RDBO-derived class. Anyway, like I said, get the db from wherever you want.
The important part is to share it among all the queries that are used to
lock, get new invoice id, and unlock.
> Is it ok then to just define init_db once in the base class and never add a
> 'db' parameter in special purpose methods? I thought if no 'db' is given, the
> one from init_db is used in every search.
Yes, if your implementation of init_db() always returns the same db object
to all callers, you should be okay. That said, I think the more explicit
approach is a bit more clear, in case you (or someone else) ever change
init_db() and then forget to find every place in the code that assumes
init_db() will always return the same db object :)
-John
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