Postgres：UPDATE语句无效

我使用的是PostgreSQL 9.6.1。任何人都可以解释为什么下面的更新声明不起作用吗？Postgres：UPDATE语句无效

db=> SELECT name, contact_type_id, is_default, mod_ts FROM master.contact_type 
WHERE contact_type_id = 'c255e0f7-16b1-4f12-9ae4-8fca66073ad3'; 
    name |   contact_type_id   | is_default |   mod_ts 
---------+--------------------------------------+------------+---------------------------- 
Bar Foo | c255e0f7-16b1-4f12-9ae4-8fca66073ad3 | f   | 2017-09-13 14:40:00.961006 
(1 row) 

db=> UPDATE master.contact_type 
SET name = 'Foobar Foo' 
WHERE contact_type_id = 'c255e0f7-16b1-4f12-9ae4-8fca66073ad3'; 
UPDATE 1 
db=> SELECT name, contact_type_id, is_default, mod_ts FROM master.contact_type 
WHERE contact_type_id = 'c255e0f7-16b1-4f12-9ae4-8fca66073ad3'; 
    name |   contact_type_id   | is_default |   mod_ts 
---------+--------------------------------------+------------+---------------------------- 
Bar Foo | c255e0f7-16b1-4f12-9ae4-8fca66073ad3 | f   | 2017-09-13 14:45:15.257798 
(1 row)

正如您在上面看到的，name字段的值不会更改。我也看到没有提出错误。

这里是CONTACT_TYPE表的说明：

db=> \d master.contact_type 
         Table "master.contact_type" 
    Column  |   Type    |  Modifiers 
-----------------+-----------------------------+------------------------ 
contact_type_id | uuid      | not null 
gid_number  | uuid      | not null 
name   | character varying(75)  | not null 
mod_ts   | timestamp without time zone | not null default now() 
is_default  | boolean      | not null default false 
Indexes: 
    "pk_contact_type" PRIMARY KEY, btree (contact_type_id) WITH (fillfactor='100') 
    "unq_contact_type__gid_number__name" UNIQUE CONSTRAINT, btree (gid_number, name) WITH (fillfactor='90') 
    "idx_contact_type__gid_number" btree (gid_number) WITH (fillfactor='70') 
    "idx_contact_type__name" btree (gid_number, lower(name::text)) WITH (fillfactor='70') 
Referenced by: 
    TABLE "master.contact" CONSTRAINT "fk_contact__contact_type" FOREIGN KEY (contact_type_id) REFERENCES master.contact_type(contact_type_id) ON DELETE RESTRICT 
Triggers: 
    trg_contact_type_delete_update__preserve_default BEFORE DELETE OR UPDATE ON master.contact_type FOR EACH ROW EXECUTE PROCEDURE master.check_contact_type__is_default() 
    trg_master_contact_type__mod_ts BEFORE INSERT OR UPDATE ON master.contact_type FOR EACH ROW EXECUTE PROCEDURE common.update_stamp()

这里是触发功能定义：

CREATE FUNCTION master.check_contact_type__is_default() RETURNS TRIGGER AS $check_contact_type__is_default$ 
    BEGIN 
     IF OLD.is_default THEN 
      RAISE EXCEPTION 'Cannot update or delete default Contact Types shipped with the product.'; 
     END IF; 
     RETURN OLD; 
    END; 
$check_contact_type__is_default$ LANGUAGE plpgsql; 

CREATE FUNCTION common.update_stamp() RETURNS TRIGGER AS $update_stamp$ 
BEGIN 
    NEW.mod_ts = current_timestamp; 
    RETURN NEW; 
END; 
$update_stamp$ LANGUAGE plpgsql;

来源

2017-09-13 El Goodo

触发master.check_contact_type__is_default()返回OLD值，所以更新前的人。您想要返回NEW值。

来源

2017-09-13 15:23:07 JGH

是的，那固定它。 D'oh！ –

Postgres：UPDATE语句无效

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