sql更改表结构并将老数据导入（触发器）

 1 --1.旧表改名
 2 ALTER TABLE APP_MULTI_PARAM_test RENAME TO APP_MULTI_PARAM_test_bk;
 3 
 4 --2.创建新表
 5 CREATE TABLE APP_MULTI_PARAM_test (
 6   ID VARCHAR2(64 CHAR)PRIMARY KEY,
 7   PARAM_CODE VARCHAR2 ( 255 CHAR ) NOT NULL,
 8   PARAM_NAME VARCHAR2 ( 150 CHAR) NOT NULL,
 9   UPDATE_DATE DATE
10 );
11 --表注释
12 COMMENT ON TABLE APP_MULTI_PARAM_test IS '多格式参数配置表';
13  
14 
15 --3.创建触发器,实现旧数据导入自动插入UUID
16 CREATE OR REPLACE TRIGGER APP_MULTI_PARAM_test_bk
17   BEFORE INSERT ON APP_MULTI_PARAM_test
18   FOR EACH ROW
19   BEGIN
20     IF :NEW.ID IS NULL THEN
21       SELECT LOWER(SYS_GUID())
22       INTO :NEW.ID
23       FROM DUAL;
24     END IF;
25   END;
26 /
27 
28 --同步数据
29 INSERT INTO APP_MULTI_PARAM_test(PARAM_CODE, PARAM_NAME, UPDATE_DATE)
30 SELECT PARAM_CODE, PARAM_NAME, UPDATE_DATE  FROM APP_MULTI_PARAM_test_bk;
31 commit;
32 
33 
34 --删除触发器
35 DROP TRIGGER APP_MULTI_PARAM_test_bk;