Oracle两种方式创建自增ID

1、方式一：使用序列和触发器

1. sql>CREATESEQUENCEtest_sequence2
2. 2incrementby1--每次递增1
3. 3startwith1--从1开始
4. 4nomaxvalue--没有最大值
5. 5minvalue1--最小值=1
6. 6NOCYCLE;--不循环
8. Sequencecreated.
9. TABLEtest_create_tab2(
10. 2idINT,
11. 3valVARCHAR(10),250); line-height:18px"> 4PRIMARYKEY(id)
12. 5);
13. Tablecreated.
14. CREATEORREPLACETRIGGERBeforeTestCreate2Insert
15. 2BEFOREINSERTONtest_create_tab2
16. 3FOREACHROW
17. BEGIN
18. 5SELECTtest_sequence2.nextvalINTO:new.idFROMdual;
19. 6END;
20. 7/
21. Triggercreated.
22. INTOtest_create_tab2(val)VALUES('NOid');
23. 1rowcreated.
24. INTOtest_create_tab2(id,val)VALUES(1,'idnouse');
25. SELECT*FROMtest_create_tab2;
26. IDVAL
27. ------------------------------
28. 1NOid
29. nouse