oracle列自增实现

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了oracle列自增实现，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含2712字，纯文字阅读大概需要4分钟。

内容图文

1.Sequence+Trigger实现Oracle列自增
CREATE SEQUENCE 序列名
[INCREMENT BY n]
[START WITH n]
[{MAXVALUE/MINVALUE n|NOMAXVALUE}]
[{CYCLE|NOCYCLE}]
[{CACHE n|NOCACHE}];
创建测试表
sys@newtestCDB> CREATE TABLE TEST(
2 ID NUMBER (10) NOT NULL,
3 DESCRIPTION VARCHAR2 (50) NOT NULL,
4 CONSTRAINT test_pk PRIMARY KEY (ID)
5 );

Table created.

Elapsed: 00:00:00.14
sys@newtestCDB> CREATE SEQUENCE test_seq;

Sequence created.

Elapsed: 00:00:00.02

Elapsed: 00:00:00.38
sys@newtestCDB> CREATE OR REPLACE TRIGGER test_before_insert
2 BEFORE INSERT ON test
3 FOR EACH ROW
4 BEGIN
5 SELECT test_seq.NEXTVAL INTO :new.id FROM dual;
6 END;
7 /

Trigger created.

Elapsed: 00:00:00.12
sys@newtestCDB> INSERT INTO TEST (DESCRIPTION) VALUES (‘不指定ID‘);

1 row created.

Elapsed: 00:00:00.08
sys@newtestCDB> INSERT INTO TEST (ID, DESCRIPTION) VALUES (TEST_USER.DEPT_SEQ.NEXTVAL, ‘指定ID‘);
INSERT INTO TEST (ID, DESCRIPTION) VALUES (TEST_USER.DEPT_SEQ.NEXTVAL, ‘指定ID‘)
*
ERROR at line 1:
ORA-02289: sequence does not exist

Elapsed: 00:00:00.01
sys@newtestCDB> INSERT INTO TEST (ID, DESCRIPTION) VALUES (TEST_SEQ.NEXTVAL, ‘指定ID‘);

1 row created.

Elapsed: 00:00:00.01
sys@newtestCDB> SELECT * FROM TEST;

    ID DESCRIPTION

---

     1 不指定ID
     3 指定ID

Elapsed: 00:00:00.03
2.DEFAULT Values Using Sequences
sys@newtestCDB> INSERT INTO TEST (description) VALUES (‘DESCRIPTION only‘);

1 row created.

Elapsed: 00:00:00.01
sys@newtestCDB> INSERT INTO TEST (id, description) VALUES (999, ‘ID=999 and DESCRIPTION‘);

1 row created.

Elapsed: 00:00:00.00
sys@newtestCDB> INSERT INTO TEST (id, description) VALUES (NULL, ‘ID=NULL and DESCRIPTION‘);

1 row created.

Elapsed: 00:00:00.01
sys@newtestCDB> SELECT * FROM test;

    ID DESCRIPTION

---

     4 DESCRIPTION only
   999 ID=999 and DESCRIPTION
       ID=NULL and DESCRIPTION
Elapsed: 00:00:00.02

sys@newtestCDB> CREATE TABLE TEST(
2 ID NUMBER (10) DEFAULT ON NULL test_seq.NEXTVAL,
3 DESCRIPTION VARCHAR2 (50) NOT NULL
4 );

Table created.

Elapsed: 00:00:00.02
sys@newtestCDB> INSERT INTO TEST (description) VALUES (‘DESCRIPTION only‘);

1 row created.

Elapsed: 00:00:00.01
sys@newtestCDB> INSERT INTO TEST (id, description) VALUES (999, ‘ID=999 and DESCRIPTION‘);

1 row created.

Elapsed: 00:00:00.01
sys@newtestCDB> INSERT INTO TEST (id, description) VALUES (NULL, ‘ID=NULL and DESCRIPTION‘);

1 row created.

Elapsed: 00:00:00.01
sys@newtestCDB> SELECT * FROM test;

    ID DESCRIPTION

---

     5 DESCRIPTION only
   999 ID=999 and DESCRIPTION
     6 ID=NULL and DESCRIPTION

Elapsed: 00:00:00.02
3.看上一篇里面

oracle列自增实现

标签：follow   erro   href   esc   sys   constrain   min   tab   rem   

本文系统来源：http://blog.51cto.com/shurk/2061598

内容总结

以上是互联网集市为您收集整理的oracle列自增实现全部内容，希望文章能够帮你解决oracle列自增实现所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

---