获取Oracle触发器中的当前行数据

我有一个Oracle10g触发器，它在每行之后都有一个INSERT触发事件，我希望触发器中的一些逻辑基于当前插入的行。我希望获得要插入的Users表标志列值，然后在触发器中，仅当标志为null时，才使用if-then-else进行操作。关于如何获取插入行的标志列值，有什么想法吗？我的目标是当标志列值为null时，不执行下面触发器中的任何逻辑

Table: USERS

Columns:
id (PK generated from a DB sequence)
.... (more columns)
flag VARCHAR2(1 BYTE) and is nullable

触发器：

//goal is to not do any of the logic in the trigger below when flag is null


CREATE OR REPLACE TRIGGER "DBUSER"."TI_USERS" 
  AFTER INSERT
  on Users

  for each row

declare numrows INTEGER;
begin
    select count(*) into numrows
      from Customer
      where
        /* %JoinFKPK(:%New,Customer," = "," and") */
        :new.Customer_Key = Customer.Customer_Key;
    if (
      /* %NotnullFK(:%New," is not null and") */

      numrows = 0
    )
    then
      raise_application_error(
        -20002,
        'Cannot INSERT Users because Customer does not exist.'
      );
    end if;



end;
ALTER TRIGGER "SIMPLEX"."TI_USERS" ENABLE

---

如果：new.flag不为null，则用

包围整个块，然后。。。如果结束

如果：new.flag不为空，则用

环绕整个块。。。如果结束
此逻辑应该是外键的工作，而不是触发器。此逻辑应该是外键的工作，而不是触发器。
CREATE OR REPLACE TRIGGER "DBUSER"."TI_USERS" 
  AFTER INSERT
  on Users

  for each row

declare numrows INTEGER;
begin

IF ( :new.flag IS NOT NULL ) Then

    select count(*) into numrows
      from Customer
      where
        /* %JoinFKPK(:%New,Customer," = "," and") */
        :new.Customer_Key = Customer.Customer_Key;
    if (
      /* %NotnullFK(:%New," is not null and") */

      numrows = 0
    )
    then
      raise_application_error(
        -20002,
        'Cannot INSERT Users because Customer does not exist.'
      );
    end if;

end if;

end;
ALTER TRIGGER "SIMPLEX"."TI_USERS" ENABLE