userCanClickZan($user); default: return true; } } public static function query($id, $type, $user) { if ($user == null) { return 0; } $row = DB::selectFirst([ "select val from click_zans", "where", [ 'username' => $user['username'], 'type' => $type, 'target_id' => $id ] ]); if ($row == null) { return 0; } return $row['val']; } public static function click($id, $type, $user, $delta) { if (!DB::$in_transaction) { return DB::transaction(fn() => ClickZans::click($id, $type, $user, $delta)); } $table_name = ClickZans::getTable($type); $cur = ClickZans::query($id, $type, $user); $row = DB::selectFirst([ "select zan from", DB::table($table_name), "where", ['id' => $id], DB::for_update() ]); if (!$row) { return '
failed
'; } if ($cur != $delta) { $cur += $delta; if ($cur == 0) { DB::delete([ "delete from click_zans", "where", [ 'username' => Auth::id(), 'type' => $type, 'target_id' => $id ] ]); } elseif ($cur != $delta) { DB::update([ "update click_zans", "set", ['val' => $cur], "where", [ 'username' => Auth::id(), 'type' => $type, 'target_id' => $id ] ]); } else { DB::insert([ "insert into click_zans", "(username, type, target_id, val)", "values", DB::tuple([Auth::id(), $type, $id, $cur]) ]); } $cnt = $row['zan'] + $delta; DB::update([ "update", DB::table($table_name), "set", ['zan' => $cnt], "where", ['id' => $id] ]); } else { $cnt = $row['zan']; } return ClickZans::getBlock($type, $id, $cnt, $cur); } public static function getBlock($type, $id, $cnt, $val = null) { if ($val === null) { $val = ClickZans::query($id, $type, Auth::user()); } return '
'; } public static function getCntBlock($cnt) { $cls = 'uoj-click-zan-block-'; if ($cnt > 0) { $cls .= 'positive'; } elseif ($cnt < 0) { $cls .= 'negative'; } else { $cls .= 'neutral'; } return '[' . ($cnt > 0 ? '+' . $cnt : $cnt) . ']'; } }