sql - 多次插入 PostgreSQL

Question

我正在尝试从 1 个 sql 查询执行多个插入。分解我在这里要做的是数据库结构:

links:
  - id // uuid_generate_v4()
  - hash

permissions:
  - id // uuid_generate_v4()
  - name

photos:
  - id // uuid_generate_v4()
  - url

link_permissions:
  - link_id
  - permission_id

link_photo:
  - link_id
  - photo_id

现在，每当我插入一个链接时，我还需要插入它的权限和照片。这是我到目前为止尝试过的 sql 查询。

WITH link as (
    INSERT INTO links(hash) VALUES ('my-random-hash') 
    RETURNING *
) 
INSERT INTO link_photo(link_id, photo_id) 
VALUES ((select link.id from link), '095ccacf-ebc1-4991-8ab0-cac13dac02b7'), 
INSERT INTO link_permission(link_id, permission_id) 
VALUES ((select link.id from link), '506f3302-fe9f-4982-8439-d6781f646d01')

和

WITH link as (
  INSERT INTO links(hash) VALUES ('my-random-hash') 
  RETURNING *
) 
(INSERT INTO link_photo(link_id, photo_id) 
  VALUES ((select link.id from link), '095ccacf-ebc1-4991-8ab0-cac13dac02b7')), 
 INSERT INTO link_permission(link_id, permission_id) 
 VALUES ((select link.id from link), '506f3302-fe9f-4982-8439-d6781f646d01')

我将如何编写此查询？

Answer 1

只需将第二个插入到另一个 CTE 中:

WITH link as (
    INSERT INTO links(hash) VALUES ('my-random-hash') 
    RETURNING *
) , lp as (
  INSERT INTO link_photo(link_id, photo_id) 
  VALUES ((select link.id from link), '095ccacf-ebc1-4991-8ab0-cac13dac02b7')
)
INSERT INTO link_permission(link_id, permission_id) 
VALUES ((select link.id from link), '506f3302-fe9f-4982-8439-d6781f646d01');

或者，不要使用 values，这会使查询更容易阅读(我认为)

WITH link as (
    INSERT INTO links(hash) VALUES ('my-random-hash') 
    RETURNING *
) , lp as (
  INSERT INTO link_photo(link_id, photo_id) 
  select id, '095ccacf-ebc1-4991-8ab0-cac13dac02b7'
  from link
)
INSERT INTO link_permission(link_id, permission_id) 
select id, '506f3302-fe9f-4982-8439-d6781f646d01'
from link;