Oracle - Trigger

A: 数据插入之前更新

CREATE OR REPLACE TRIGGER TablesNameID
before insert ON TablesName for each row
begin
 --业务逻辑
end TablesNameID;

B：数据插入之后更新

CREATE OR REPLACE TRIGGER TablesNameID
after insert ON TablesName for each row
begin
 --业务逻辑
end TablesNameID;

C：数据更新之后更新　

CREATE OR REPLACE TRIGGER TableNamesAfterUpdate
after UPDATE ON TableNames FOR EACH ROW
begin
 --业务逻辑
end;

D：数据更新之前更新

 

CREATE OR REPLACE TRIGGER TableNamesBeforeUpdate
before UPDATE ON TableNames FOR EACH ROW
begin
--业务逻辑
end;

C：混合情况下的自动触发

CREATE OR REPLACE TRIGGER TabelNameTrigger
 before INSERT OR UPDATE ON TableName
FOR EACH ROW
DECLARE
--参数
BEGIN
  --业务逻辑
  if :new.texture = '铜丝' then
    :new.texture := 'Cu';
  end if;
  if :new.texture = '金丝' then
    :new.texture := 'Au';
  end if;
END;

  

 

 

 

 

　

来源：https://www.cnblogs.com/jeremywucnblog/p/11399121.html