以下针对apache derby的sql语句工作正常:
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;
输出:
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
但是,当我“知道”某些记录的ID并在INSERT语句中设置ID时:
## 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
如何解决此问题,如何在其中有时可以设置主键的auto_increment列?
最佳答案
您正在寻找ALTER TABLE ... RESTART WITH。这是文档:
http://db.apache.org/derby/docs/10.9/ref/rrefsqlj81859.html#rrefsqlj81859__rrefsqlj37860
关于sql - apache derby:为列 “GENERATED BY DEFAULT AS IDENTITY”指定ID,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16559345/