session locks can also be kept on the table that is being locked (or the root table of a set of tables).
会话锁还可保存在被锁定的表中(或表集合的根表中)。
joseph seemed sitting in a sort of elysium alone, beside a roaring fire; a quart of ale on the table near him, bristling with large pieces of toasted oatcake; and his black, short pipe in his mouth.