Kathryn Cassidy wrote:
> Now the module will need to use the DBI module in order to connect to
> the database, but the scripts that it will be called from will also
> usually use DBI. Does this mean that the whole DBI module will be
> imported twice for each script which uses this module? Or does perl
> only load a module if it's not already been imported?
The latter. See `perldoc -f use` and `perldoc -f require`. 'use' builds on
'require', and 'require' checks to see whether a module has already been
loaded. So you should get the overhead of loading and parsing DBI.pm only
once, though DBI->import gets called multiple times: once for each 'use'
(but that shouldn't be a problem).
Cheers,
Philip
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