+=item seconds_since_sqlradacct TIMESTAMP_START TIMESTAMP_END ( DBI_DATABASE_HANDLE | DATASRC DB_USERNAME DB_PASSWORD )
+
+See L<FS::svc_acct/seconds_since_sqlradacct>. Equivalent to
+$cust_svc->svc_x->seconds_since, but more efficient. Meaningless for records
+where B<svcdb> is not "svc_acct".
+
+NOTE: specifying a DATASRC/USERNAME/PASSWORD instead of a DBI database handle
+is not yet implemented.
+
+=cut
+
+#note: implementation here, POD in FS::svc_acct
+sub seconds_since_sqlradacct {
+ my($self, $start, $end, $dbh) = @_;
+
+ my $username = $self->svc_x->username;
+
+ #select a unix time conversion function based on database type
+ my $str2time;
+ if ( $dbh->{Driver}->{Name} eq 'mysql' ) {
+ $str2time = 'UNIX_TIMESTAMP(';
+ } elsif ( $dbh->{Driver}->{Name} eq 'Pg' ) {
+ $str2time = 'EXTRACT( EPOCH FROM ';
+ } else {
+ warn "warning: unknown database type ". $dbh->{Driver}->{Name}.
+ "; guessing how to convert to UNIX timestamps";
+ $str2time = 'extract(epoch from ';
+ }
+
+ #find sessions completely within the given range
+ my $sth = $dbh->prepare("SELECT SUM(acctsessiontime)
+ FROM radacct
+ WHERE UserName = ?
+ AND $str2time AcctStartTime) >= ?
+ AND $str2time AcctStopTime ) < ?
+ AND AcctStopTime =! 0
+ AND AcctStopTime IS NOT NULL"
+ ) or die $dbh->errstr;
+ $sth->execute($username, $start, $end) or die $sth->errstr;
+ my $regular = $sth->fetchrow_arrayref->[0];
+
+ #find open sessions which start in the range, count session start->range end
+ $sth = $dbh->prepare("SELECT SUM( ? - $str2time AcctStartTime ) )
+ FROM radacct
+ WHERE UserName = ?
+ AND AcctStartTime >= ?
+ AND ( AcctStopTime = 0
+ OR AcctStopTime IS NULL )"
+ ) or die $dbh->errstr;
+ $sth->execute($end, $username, $start) or die $sth->errstr;
+ my $start_during = $sth->fetchrow_arrayref->[0];
+
+ #find closed sessions which start before the range but stop during,
+ #count range start->session end
+ $sth = $dbh->prepare("SELECT SUM( $str2time AcctStopTime ) - ? )
+ FROM radacct
+ WHERE UserName = ?
+ AND AcctStartTime < ?
+ AND AcctStopTime >= ?
+ AND AcctStopTime < ?
+ AND AcctStopTime != 0
+ AND AcctStopTime IS NOT NULL"
+ ) or die $dbh->errstr;
+ $sth->execute($start, $username, $start, $start, $end ) or die $sth->errstr;
+ my $end_during = $sth->fetchrow_arrayref->[0];
+
+ #find closed or open sessions which start before the range but stop
+ # after, or are still open, count range start->range end
+ $sth = $dbh->prepare("SELECT COUNT(*)
+ FROM radacct
+ WHERE UserName = ?
+ AND AcctStartTime < ?
+ AND ( AcctStopTime >= ?
+ OR AcctStopTime = 0
+ OR AcctStopTime IS NULL )"
+ ) or die $dbh->errstr;
+ $sth->execute($username, $start, $end ) or die $sth->errstr;
+ my $entire_range = ($end-$start) * $sth->fetchrow_arrayref->[0];
+
+ $regular + $end_during + $start_during + $entire_range;
+}
+