Hi,
is it ok to assign an object to a state variable? Or does doing so
involve a chance of causing problems because objects are not supposed or
designed to be used with the state-feature?
Example:
use feature qw(state);
use DBI;
sub foo {
my ($dbh, $q, $finish) = @_;
state $sth = $dbh->prepare("SELECT foo FROM bar WHERE baz = ? LIMIT 1");
if($finish) {
$sth->finish();
return 0;
}
$sth->execute($q);
my ($ret) = $dbh->selectrow_array($sth);
return $ret;
}
#
# do some stuff like connecting to database etc.
#
foreach (1..10) {
my $z = foo($dbh, $_, 0);
#
# do more stuff with $z
#
my $x = foo($dbh, $z, 0);
#
# ...
#
}
foo($dbh, 1);
exit 0;
I think it would be nicer to keep statement handles ($sth) contained within
the functions that use them instead of defining them in the main part and
handing them over to the functions. Their very purpose is that you define
a handle once and use it multiple times, thus saving the overhead of
interpreting the statement every time it is used.
But can I safely use a state-variable like this? If not, then what?
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