sql更改表结构并将老数据导入（触发器）

--1.旧表改名
ALTER TABLE APP_MULTI_PARAM_test RENAME TO APP_MULTI_PARAM_test_bk;

--2.创建新表
CREATE TABLE APP_MULTI_PARAM_test (
  ID VARCHAR2(64 CHAR)PRIMARY KEY,
  PARAM_CODE VARCHAR2 ( 255 CHAR ) NOT NULL,
  PARAM_NAME VARCHAR2 ( 150 CHAR) NOT NULL,
  UPDATE_DATE DATE
);
--表注释
COMMENT ON TABLE APP_MULTI_PARAM_test IS '多格式参数配置表';
 

--3.创建触发器,实现旧数据导入自动插入UUID
CREATE OR REPLACE TRIGGER APP_MULTI_PARAM_test_bk
  BEFORE INSERT ON APP_MULTI_PARAM_test
  FOR EACH ROW
  BEGIN
    IF :NEW.ID IS NULL THEN
      SELECT LOWER(SYS_GUID())
      INTO :NEW.ID
      FROM DUAL;
    END IF;
  END;
/

--同步数据
INSERT INTO APP_MULTI_PARAM_test(PARAM_CODE, PARAM_NAME, UPDATE_DATE)
SELECT PARAM_CODE, PARAM_NAME, UPDATE_DATE  FROM APP_MULTI_PARAM_test_bk;
commit;


--删除触发器
DROP TRIGGER APP_MULTI_PARAM_test_bk;