Example of a closure
A standard use of DBI.
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my $sth = $dbh->prepare($sql); $sth->execute(@args) while ( my $record = $sth->fetchrow_arrayref() ) { # do something with $record } |
$sth->fetchrow_arrayref() is the iterator. It returns one record at a time from the result set of the query.
Or if you haven't used DBI, what about filehandles?
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open FH "myfile.txt" or die "myfile.txt: $!\n"; while(<FH>) { # do something } close FH; |