ORACLE直接锁表方法是什么？

操作语法：

lock table table_name1 [,table_2, …, table_n] in lock_mode mode nowait

操作模式：

lock table table_name in share mode;

lock table table_name in exclusive mode nowait;

lock table table_name in share update mode;

lock table table_name in row exclusive mode nowait;

lock table table_name in share row exclusive mode;

lock table table_name in row share mode nowait;