更新和删除Oracle触发器

Question

几天前发布了一个问题，并成功地让我的触发器工作！但是有一些新的问题。

我有两张表：

CREATE TABLE  "ASSESSMENT" 
  (     "ASSESSMENT_NAME" VARCHAR2(50) NOT NULL ENABLE, 
        "DEADLINE_DATE" DATE NOT NULL ENABLE, 
         CONSTRAINT "ASSESSMENT_PK" PRIMARY KEY ("ASSESSMENT_NAME") ENABLE
  )

CREATE TABLE  "ASSESSMENT_ANNOUNCEMENT" 
  (    "ASSESSMENT_NAME" VARCHAR2(50) NOT NULL ENABLE, 
        "DEADLINE_DATE" DATE NOT NULL ENABLE, 
        "ATTENTION" VARCHAR2(500) NOT NULL ENABLE, 
        CONSTRAINT "ASSESSMENT_ANNOUNCEMENT_PK" PRIMARY KEY ("ASSESSMENT_NAME")  ENABLE
  )

我的触发器是：

CREATE OR REPLACE TRIGGER  "TEST"
  AFTER INSERT OR UPDATE OR DELETE 
  ON ASSESSMENT
FOR EACH ROW
BEGIN
  IF :new.DEADLINE_DATE >= SYSDATE - 7
  THEN
    INSERT INTO ASSESSMENT_ANNOUNCEMENT(ASSESSMENT_NAME, DEADLINE_DATE ,ATTENTION)
      VALUES(:new.ASSESSMENT_NAME, :new.DEADLINE_DATE, 'DEADLINE IS 7 DAYS OR LESS!');
  END IF;
END;

Insert可以在所有表中正常工作。但是，当我在ASSESSMENT表上更新时，在ASSESSMENT_ANNOUNCEMENT表中插入了一个新行-它没有更新。

从ASSESSMENT表中删除会从ASSESSMENT表中删除行，但不会从ASSESSMENT_ANNOUNCEMENT表中删除条目。

任何帮助和/或指导都是非常棒的！

Answer 1

如果要更新或删除ASSESSMENT_ANNOUNCEMENT中的行，则应使用update或delete语句显式完成。

在触发器中使用以下结构：

IF INSERTING THEN
  -- actions for inserting
ELSIF UPDATING THEN
  -- actions for updating
ELSE
  -- actions for deleting
END IF;

Answer 2

只是为了给你一个完整的样本

CREATE OR REPLACE TRIGGER  "TEST"
    AFTER INSERT OR UPDATE OR DELETE 
    ON ASSESSMENT
FOR EACH ROW
BEGIN
    IF INSERTING THEN
        IF :new.DEADLINE_DATE >= SYSDATE - 7
        THEN
            INSERT INTO ASSESSMENT_ANNOUNCEMENT(ASSESSMENT_NAME, DEADLINE_DATE ,ATTENTION)
            VALUES(:new.ASSESSMENT_NAME, :new.DEADLINE_DATE, 'DEADLINE IS 7 DAYS OR LESS!');
        END IF;

    ELSIF UPDATING THEN
        UPDATE ASSESSMENT_ANNOUNCEMENT SET 
          ASSESSMENT_NAME=:new.ASSESSMENT_NAME,
          DEADLINE_DATE=:new.DEADLINE_DATE,
          ATTENTION='Deadline Updated'
        WHERE ASSESSMENT_NAME=:old.ASSESSMENT_NAME;

    ELSE
       DELETE ASSESSMENT_ANNOUNCEMENT
         WHERE ASSESSMENT_NAME=:old.ASSESSMENT_NAME;
    END IF; 
END;

根据您的实际业务逻辑和PL/SQL代码的大小，创建三个触发器可能会更清楚

CREATE OR REPLACE TRIGGER "TEST_AI_TRG" AFTER INSERT ON ASSESSMENT ...
CREATE OR REPLACE TRIGGER "TEST_AU_TRG" AFTER UPDATE ON ASSESSMENT ...
CREATE OR REPLACE TRIGGER "TEST_AD_TRG" AFTER DELETE ON ASSESSMENT ...