protected static function reserveIds($table, $count) {
		global $DB;

		$tableSchema = self::getSchema($table);
		$id_name = $tableSchema['key'];

		$sql = 'SELECT nextid'.
				' FROM ids'.
				' WHERE table_name='.zbx_dbstr($table).
					' AND field_name='.zbx_dbstr($id_name);

		// SQLite3 does not support this syntax. Since we are in transaction, it can be ignored.
		if ($DB['TYPE'] != ZBX_DB_SQLITE3) {
			$sql = $sql.' FOR UPDATE';
		}

		$res = DBfetch(DBselect($sql));

		if ($res) {
			$maxNextId = bcadd($res['nextid'], $count, 0);

			if (bccomp($maxNextId, ZBX_DB_MAX_ID) == 1) {
				$nextid = self::refreshIds($table, $count);
			}
			else {
				$sql = 'UPDATE ids'.
						' SET nextid='.$maxNextId.
						' WHERE table_name='.zbx_dbstr($table).
							' AND field_name='.zbx_dbstr($id_name);

				if (!DBexecute($sql)) {
					self::exception(self::DBEXECUTE_ERROR, 'DBEXECUTE_ERROR');
				}

				$nextid = bcadd($res['nextid'], 1, 0);
			}
		}
		else {
			$nextid = self::refreshIds($table, $count);
		}

		return $nextid;
	}

...
private static function refreshIds($table, $count) {
		$tableSchema = self::getSchema($table);
		$id_name = $tableSchema['key'];

		// when we reach the maximum ID, we try to refresh them to check if any IDs have been freed
		$sql = 'DELETE FROM ids WHERE table_name='.zbx_dbstr($table).' AND field_name='.zbx_dbstr($id_name);

		if (!DBexecute($sql)) {
			self::exception(self::DBEXECUTE_ERROR, 'DBEXECUTE_ERROR');
		}

		$row = DBfetch(DBselect('SELECT MAX('.$id_name.') AS id FROM '.$table));

		$nextid = ($row && $row['id']) ? $row['id'] : 0;

		$maxNextId = bcadd($nextid, $count, 0);

		if (bccomp($maxNextId, ZBX_DB_MAX_ID) == 1) {
			self::exception(
				self::RESERVEIDS_ERROR, __METHOD__.' ID greater than maximum allowed for table "'.$table.'"'
			);
		}

		$sql = 'INSERT INTO ids (table_name,field_name,nextid)'.
				' VALUES ('.zbx_dbstr($table).','.zbx_dbstr($id_name).','.$maxNextId.')';

		if (!DBexecute($sql)) {
			self::exception(self::DBEXECUTE_ERROR, 'DBEXECUTE_ERROR');
		}

		$nextid = bcadd($nextid, 1, 0);

		return $nextid;
	}

$sql = 'INSERT INTO '.$table.' ('.implode(',', array_keys($row)).')'.
					' VALUES ('.implode(',', array_values($row)).')';

			if (!DBexecute($sql)) {
				self::exception(self::DBEXECUTE_ERROR, _s('SQL statement execution has failed "%1$s".', $sql));
			}