From what I've read and from my recent experience with DBI, you'll have an easier time if you bind your columns. You can do something like this:
my $b;
my $sql = qq{SELECT b FROM blah WHERE user = ?};
my $sth = $dbh->prepare("$sql");
$sth -> execute("bahbah");
$sth -> bind_col(1,\$b);
while( $sth->fetchall_arrayref ) {
print "$b\n" if $_;
}
Update: Indeed, runrig, that was bad. I munged the following two methods (perhaps neither of which fully applies since the OP is fetching hashrefs.)
my $b;
my $sql = qq{SELECT b FROM blah WHERE user = ?};
my $sth = $dbh->prepare("$sql");
$sth -> execute('bahbah');
$sth -> bind_col(1,\$b);
while( $sth->fetch ) {
print "$b\n";
}
################
# OR:
################
my $sql = qq{SELECT b FROM blah WHERE user = ?};
my $sth = $dbh->prepare("$sql");
$sth -> execute('bahbah');
my $rows = []; # cache for batches of rows
while(my $row = shift(@$rows)
|| shift(@{$rows=$sth->fetchall_arrayref([0],10_000)||
+[]})) {
print "$row->[0]\n";
}
Incidentally, while both produce the same lists, do you know why the latter also gives "ERROR no statement executing (perhaps you need to call execute first)"?
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