On Tue, Nov 25, 2003 at 10:43:27AM -0800, Bryn Dyment wrote: [snip] > Questions (using DBI as an example*): > > 1. If my preloaded (via startup.pl) "my.pm" module uses DBI, should I > explicitly "use DBI ()" in startup.pl as well?
The second `use DBI' will be ignored, since DBI is already in %INC. Doesn't hurt to include it, though. It will avoid annoying errors if you ever remove `my.pm' for whatever reason. > 2. Related to that, is it then kosher for my (non-preloaded Mason) "my.html" > component to call a DBI method directly (e.g., "$dbH->disconnect")? Or... Assuming `$dbH' is somehow available to your Mason component. It's a blessed reference, so Perl knows what method to call. > 3. Should all calls to DBI from my ".html" components always be made > indirectly, via (for example) the preloaded "my.pm" module (e.g. calling > "$myH->myDisconnect")? Does `my.pm' provide any added functionality over DBI? > 4. I read about "use DBI" vs. "use DBI ()". Does this hold true for my own > modules, too? (I'm asking, because I'm looking at someone's startup.pl > file, and they're only using "()" for the CPAN modules, not their own.) Yes and no. It depends on whether or not you export any symbols using Exporter (or a custom import() method). `use DBI' both requires DBI and calls its import() method to import any symbols into your namespace. `use DBI ()' skips the call to import(). Many people (myself included) always use the parens to avoid potential namespace pollution. -chris
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