Apache derby の次の SQL ステートメントは正常に動作します。
connect 'jdbc:derby://uri';
create schema TEST02;
set schema TEST02 ;
create table T
(
id INT not null primary key GENERATED BY DEFAULT AS IDENTITY (START WITH 1, INCREMENT BY 1),
name varchar(50) not null unique
);
insert into T(name) values ('NAME02');
insert into T(name) values ('NAME03');
select * from T;
drop table T ;
drop schema TEST02 RESTRICT;
disconnect;
出力:
ij> insert into T(name) values ('NAME02');
1 row inserted/updated/deleted
ij> insert into T(name) values ('NAME03');
1 row inserted/updated/deleted
ij> select * from T;
ID |NAME
--------------------------------------------------------------
1 |NAME02
2 |NAME03
しかし、いくつかのレコードの ID を「知っている」場合、INSERT ステートメントで ID を設定します。
## here I set the id column
ij> insert into T(id,name) values (1,'NAME01');
1 row inserted/updated/deleted
ij> insert into T(name) values ('NAME02');
ERROR 23505: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL130515100041380' defined on 'T'.
ij> insert into T(name) values ('NAME03');
1 row inserted/updated/deleted
ij> select * from T;
ID |NAME
--------------------------------------------------------------
1 |NAME01
2 |NAME03
2 rows selected
どうすればこれを修正できますか?主キーを設定できる auto_increment 列を作成するにはどうすればよいですか?