www: favor reading more from SQLite, and less from Xapian

[public-inbox.git] / lib / PublicInbox / Over.pm

diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm
index b230d44a105791442f7262d7cb6b6be6686c45a0..309e044af91a1b35907b057750afe930d6a9b081 100644 (file)
--- a/lib/PublicInbox/Over.pm
+++ b/lib/PublicInbox/Over.pm
@@ -50,9 +50,7 @@ sub do_get {
        my ($self, $sql, $opts, @args) = @_;
        my $dbh = $self->connect;
        my $lim = (($opts->{limit} || 0) + 0) || 1000;
-       my $off = (($opts->{offset} || 0) + 0) || 0;
        $sql .= "LIMIT $lim";
-       $sql .= " OFFSET $off" if $off > 0;
        my $msgs = $dbh->selectall_arrayref($sql, { Slice => {} }, @args);
        load_from_row($_) for @$msgs;
        $msgs
@@ -77,7 +75,7 @@ ORDER BY num ASC
 sub nothing () { wantarray ? (0, []) : [] };
 
 sub get_thread {
-       my ($self, $mid, $opts) = @_;
+       my ($self, $mid, $prev) = @_;
        my $dbh = $self->connect;
 
        my $id = $dbh->selectrow_array(<<'', undef, $mid);
@@ -96,13 +94,14 @@ SELECT tid,sid FROM over WHERE num = ? LIMIT 1
 
        defined $tid or return nothing; # $sid may be undef
 
-       my $cond = 'FROM over WHERE (tid = ? OR sid = ?) AND num > 0';
-       my $msgs = do_get($self, <<"", $opts, $tid, $sid);
-SELECT * $cond ORDER BY ts ASC
+       $prev ||= 0;
+       my $cond = 'FROM over WHERE (tid = ? OR sid = ?) AND num > ?';
+       my $msgs = do_get($self, <<"", {}, $tid, $sid, $prev);
+SELECT * $cond ORDER BY num ASC
 
        return $msgs unless wantarray;
 
-       my $nr = $dbh->selectrow_array(<<"", undef, $tid, $sid);
+       my $nr = $dbh->selectrow_array(<<"", undef, $tid, $sid, $prev);
 SELECT COUNT(num) $cond
 
        ($nr, $msgs);
@@ -148,4 +147,33 @@ SELECT * from OVER where num = ? LIMIT 1
        undef;
 }
 
+sub next_by_mid {
+       my ($self, $mid, $id, $prev) = @_;
+       my $dbh = $self->connect;
+
+       unless (defined $$id) {
+               my $sth = $dbh->prepare_cached(<<'', undef, 1);
+       SELECT id FROM msgid WHERE mid = ? LIMIT 1
+
+               $sth->execute($mid);
+               $$id = $sth->fetchrow_array;
+               defined $$id or return;
+       }
+       my $sth = $dbh->prepare_cached(<<"", undef, 1);
+SELECT num FROM id2num WHERE id = ? AND num > ?
+ORDER BY num ASC LIMIT 1
+
+       $$prev ||= 0;
+       $sth->execute($$id, $$prev);
+       my $num = $sth->fetchrow_array or return;
+       $$prev = $num;
+
+       $sth = $dbh->prepare_cached(<<"", undef, 1);
+SELECT num,ts,ds,ddd FROM over WHERE num = ? LIMIT 1
+
+       $sth->execute($num);
+       my $smsg = $sth->fetchrow_hashref or return;
+       load_from_row($smsg);
+}
+
 1;