Oracle12c:支持通过创建identity columen来实现创建自增列

Connected to Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 2 Connected as My@TEST 3 4 SQL> 5 SQL> create table tab_test2 6 2 ( 7 3 id number(38) generated as identity (start with 1 increment by 1), 8 4 name varchar2(30), 9 5 constraint PK_tab_test2 primary key (id) 10 6 ); 11 Table created 12 13 SQL> insert into tab_test2(name)values(‘hello‘); 14 1 row inserted 15 16 SQL> select * from tab_test2; 17 ID NAME 18 --------------------------------------- ------------------------------ 19 1 hello 20 21 SQL> insert into tab_test2(name)values(‘hello2‘); 22 1 row inserted 23 24 SQL> insert into tab_test2(name)values(‘hello3‘); 25 1 row inserted 26 27 SQL> select * from tab_test2; 28 ID NAME 29 --------------------------------------- ------------------------------ 30 1 hello 31 2 hello2 32 3 hello3 33 34 SQL> drop table tab_test2; 35 Table dropped

当然也支持12c之前的版本所采用的方案：sequence+trigger的方案

 1 SQL> 
 2 SQL> create table t_test (id number,name varchar2(100));
 3 Table created
 4 SQL> create sequence t_test_sequence
 5   2  increment by 1
 6   3  minvalue 1
 7   4  nomaxvalue
 8   5  start with 1
 9   6  cache 20
10   7  order;
11 Sequence created
12 SQL> create or replace trigger t_test_id
13   2  before insert on t_test
14   3  for each row
15   4  begin
16   5  select t_test_sequence.nextval into :new.id from dual;
17   6  end;
18   7  /
19 Trigger created
20 SQL> insert into t_test(name) values(‘hello1‘);
21 1 row inserted
22 SQL> insert into t_test(name) values(‘hello2‘);
23 1 row inserted
24 SQL> insert into t_test(name) values(‘hello3‘);
25 1 row inserted
26 
27 SQL> select * from t_test;
28         ID NAME
29 ---------- --------------------------------------------------------------------------------
30          1 hello1
31          2 hello2
32          3 hello3
33 
34 SQL> drop table t_test;
35 Table dropped
36 
37 SQL> 

 

查阅文档：

http://www.xifenfei.com/2015/03/oracle-12c-%E6%96%B0%E7%89%B9%E6%80%A7identity-columns-%E5%AE%9E%E7%8E%B0oracle%E8%87%AA%E5%A2%9E%E9%95%BF%E5%88%97%E5%8A%9F%E8%83%BD.html

Oracle12c:支持通过创建identity columen来实现创建自增列

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