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我有一个 Oracle 10g 触发器，它在每一行之后都有一个 INSERT 触发事件，我想在触发器中基于当前插入的行的一些逻辑。我想获取插入的用户表标志列值，然后在触发器中，仅当标志为空时才使用 if-then-else 执行某些操作。关于如何获取被插入行的标志列值的任何想法？我的目标是在标志列值为空时不执行以下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

扳机：

//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
4

2 回答 2

2 
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
于 2013-03-27T20:48:55.477 回答
2

包围整个街区if :new.flag is not null then ... end if;

于 2013-03-27T20:51:21.977 回答