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Re: array references in DBI

by ioannis (Prior)
on May 13, 2006 at 09:48 UTC ( #549207=note: print w/replies, xml ) Need Help??

in reply to array references in DBI

Note. The code that worked came close to not working either. Each iteration tried to save the same reference!
push @OrderedQuestions, \@an ;
It only worked because @an was declared lexical and not global:

This almost identical code will not work
with the keyword my is missing:

while ( @an = $sth->fetchrow_array) { push (@OrderedQuestions, \@an); }

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Re^2: array references in DBI
by BrianC (Acolyte) on May 13, 2006 at 16:14 UTC
    Thank you for pointing this out. What if @an was lexical but declared before the while loop? I would have the same problem, no?
      Yes, you would be pushing the same array ref every time, and the contents would change afterwards.

      Test code (no DBI involved):

      my @rows; my @row = qw(one two); push @rows, \@row; @row = qw(three four); use Data::Dumper; print Dumper \@rows; __END__ $VAR1 = [ [ 'three', 'four' ] ];

      As you can see, the contents of the collating array changes after you put it in there.

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