我们的数据库当前没有在任何表上定义主键。所有id
列都只是唯一索引。我删除这些索引并用正确的主键替换它们。添加主键更改列类型
我的问题:在Postgres的8.4.7,特别是一个表改变从bigint
数据类型到integer
当我添加主键表。
我有如下表定义:
psql=# \d events
Table "public.events"
Column | Type | Modifiers
-----------------------+--------------------------+-----------------------------------------------------
id | bigint | not null default nextval('events_id_seq'::regclass)
[more columns omitted]
Indexes:
"events_id_unique_pk" UNIQUE, btree (id)
Foreign-key constraints:
"events_clearing_event_ref_fk" FOREIGN KEY (clearing_event_id) REFERENCES events(id)
"events_event_configs_id_fk" FOREIGN KEY (event_config_id) REFERENCES event_configs(id)
"events_pdu_circuitbreaker_id_fk" FOREIGN KEY (pdu_circuitbreaker_id) REFERENCES pdu_circuitbreaker(id)
"events_pdu_id_fk" FOREIGN KEY (pdu_id) REFERENCES pdus(id) ON DELETE CASCADE
"events_pdu_outlet_id_fk" FOREIGN KEY (pdu_outlet_id) REFERENCES pdu_outlet(id)
"events_sensor_id_fk" FOREIGN KEY (sensor_id) REFERENCES sensors(id)
"events_user_id_fk" FOREIGN KEY (clearing_user_id) REFERENCES users(id)
Referenced by:
TABLE "events" CONSTRAINT "events_clearing_event_ref_fk" FOREIGN KEY (clearing_event_id) REFERENCES events(id)
TABLE "event_params" CONSTRAINT "events_params_event_id_fk" FOREIGN KEY (event_id) REFERENCES events(id) ON DELETE CASCADE
Triggers:
event_validate BEFORE INSERT OR UPDATE ON events FOR EACH ROW EXECUTE PROCEDURE event_validate()
这是发生了什么:
psql=# ALTER TABLE events ADD PRIMARY KEY (id);
NOTICE: ALTER TABLE/ADD PRIMARY KEY will create implicit index "events_pkey" for table "events"
ALTER TABLE
psql=# \d events
Table "public.events"
Column | Type | Modifiers
-----------------------+--------------------------+-----------------------------------------------------
id | integer | not null default nextval('events_id_seq'::regclass)
[more columns omitted]
Indexes:
"events_pkey" PRIMARY KEY, btree (id)
"events_id_unique_pk" UNIQUE, btree (id)
Foreign-key constraints:
"events_clearing_event_ref_fk" FOREIGN KEY (clearing_event_id) REFERENCES events(id)
"events_event_configs_id_fk" FOREIGN KEY (event_config_id) REFERENCES event_configs(id)
"events_pdu_circuitbreaker_id_fk" FOREIGN KEY (pdu_circuitbreaker_id) REFERENCES pdu_circuitbreaker(id)
"events_pdu_id_fk" FOREIGN KEY (pdu_id) REFERENCES pdus(id) ON DELETE CASCADE
"events_pdu_outlet_id_fk" FOREIGN KEY (pdu_outlet_id) REFERENCES pdu_outlet(id)
"events_sensor_id_fk" FOREIGN KEY (sensor_id) REFERENCES sensors(id)
"events_user_id_fk" FOREIGN KEY (clearing_user_id) REFERENCES users(id)
Referenced by:
TABLE "events" CONSTRAINT "events_clearing_event_ref_fk" FOREIGN KEY (clearing_event_id) REFERENCES events(id)
TABLE "event_params" CONSTRAINT "events_params_event_id_fk" FOREIGN KEY (event_id) REFERENCES events(id) ON DELETE CASCADE
Triggers:
event_validate BEFORE INSERT OR UPDATE ON events FOR EACH ROW EXECUTE PROCEDURE event_validate()
我考虑了几个解决方法,但我真的宁愿知道为什么它的发生。还有一些其他表也使用bigint
,所以我不想只是解决方案。
这是用Liquibase编写的脚本,但它也直接发生在Postgres控制台中。
更新
其他两个点:
- 我可以创建一个简单的表与
bigint
ID和id
唯一索引,添加主键,列类型保持不变。 - 执行时所有表都是空的。
它可能与约束有关吗?
我发现很难相信添加主键约束可能会改变列的类型,但是让我们暂时假设它是一个错误。更新到最新的次要版本并再次测试。 – 2012-02-29 00:23:25
@ MilenA.Radev这是控制台的文字输出,并且这三个命令是按顺序输入的。无论如何,我们正在从Postgres 8.4升级到9.1。我可以在几天内对此进行测试。 – Brandan 2012-02-29 03:21:22