如何在 asyncpg 中编写此 VALUES 查询？答案

【问题标题】：How to write this VALUES query in asyncpg?如何在 asyncpg 中编写此 VALUES 查询？
【发布时间】：2022-08-19 23:12:56
【问题描述】：

我有一个看起来像这样的普通 SQL 查询

SELECT 
  v.* 
FROM 
  (
    VALUES 
      (
        \'b72c2bdcf32127a022b82c21064ad802\'
      ), 
      (
        \'db21d20c5ea6ba9b736b44016b4b4320\'
      ), 
      (
        \'775ebc584ce94112830adbe877a454c2\'
      ), 
      (
        \'40fe0182c4a226445bad99c45bed034c\'
      ), 
      (
        \'3205fda395852b36d21963a42286bbb5\'
      ), 
      (
        \'194934b1ed78233736d09eca01634d4a\'
      ), 
      (
        \'1722d450a96b89db29a1c8d0b9da5d40\'
      ), 
      (
        \'44ff4d3a67e00e9ecb937815fa860ae5\'
      ), 
      (
        \'e99aaba0414dc176735c41b0e8394218\'
      ), 
      (
        \'a51da22ef7478d3bdb2946d95ca7a59b\'
      ), 
      (
        \'712266f536b1deb21d0acd3536d8a8ac\'
      ), 
      (
        \'4355d8b9a293ec70c08e82e2221244bd\'
      ), 
      (
        \'3b7936d98340e8677f300e1b9691a4df\'
      ), 
      (
        \'19124e54e6027445c65532a9f04da80a\'
      ), 
      (
        \'dc414c23c208d356956832d31bf78029\'
      ), 
      (
        \'591360c7829185ed6426cebcf8ef0973\'
      ), 
      (
        \'34d9b4732e03ac2f19700d41e91381e3\'
      ), 
      (
        \'11579cefc7633923990450004b44a51c\'
      ), 
      (
        \'7be08be35e70c4bb1f29723f1354ce0e\'
      ), 
      (
        \'172674d396371e6fc9818527564795ce\'
      ), 
      (
        \'04390dcbbe0299c17d64926e38fbfe20\'
      ), 
      (
        \'8749424a929ca2ed25bb92d6572958df\'
      ), 
      (
        \'5d18010f8da43b3d884f680f5f4faa12\'
      ), 
      (
        \'e97a9c67ae9161509e9927da1810585c\'
      ), 
      (
        \'7cbb79c8bb3139f4bf7345715c6aca7e\'
      ), 
      (
        \'97f30a0949a859eccc18a75d92063730\'
      ), 
      (
        \'6f67bd03a7a7b0b8c3a8ea932e0048a6\'
      ), 
      (
        \'6665b996b3709228ec9e2b39b127150f\'
      ), 
      (
        \'10671b983ca0a93c141bf19ca0ecd95e\'
      ), 
      (
        \'2761d64452b777c783f3a4afbd60c71e\'
      )
  ) v(feed_item_id) 
where 
  not exists (
    select 
      1 
    from 
      feed_items ub 
    where 
      ub.feed_item_id = v.feed_item_id :: uuid
  );

如果我想用列表动态构建它，我如何在 asyncpg 中编写这个查询？

标签： python-3.x postgresql python-asyncio asyncpg

【解决方案1】：

给定一堆这样的值

[{'feed_item_id': 'b72c2bdcf32127a022b82c21064ad802'}, {'feed_item_id': 'db21d20c5ea6ba9b736b44016b4b4320'}, {'feed_item_id': '775ebc584ce94112830adbe877a454c2'}, {'feed_item_id': '40fe0182c4a226445bad99c45bed034c'}, {'feed_item_id': '3205fda395852b36d21963a42286bbb5'}, {'feed_item_id': '194934b1ed78233736d09eca01634d4a'}, {'feed_item_id': '1722d450a96b89db29a1c8d0b9da5d40'}, {'feed_item_id': '44ff4d3a67e00e9ecb937815fa860ae5'}, {'feed_item_id': 'e99aaba0414dc176735c41b0e8394218'}, {'feed_item_id': 'a51da22ef7478d3bdb2946d95ca7a59b'}, {'feed_item_id': '712266f536b1deb21d0acd3536d8a8ac'}, {'feed_item_id': '4355d8b9a293ec70c08e82e2221244bd'}, {'feed_item_id': '3b7936d98340e8677f300e1b9691a4df'}, {'feed_item_id': '19124e54e6027445c65532a9f04da80a'}, {'feed_item_id': 'dc414c23c208d356956832d31bf78029'}, {'feed_item_id': '591360c7829185ed6426cebcf8ef0973'}, {'feed_item_id': '34d9b4732e03ac2f19700d41e91381e3'}, {'feed_item_id': '11579cefc7633923990450004b44a51c'}, {'feed_item_id': '7be08be35e70c4bb1f29723f1354ce0e'}, {'feed_item_id': '172674d396371e6fc9818527564795ce'}, {'feed_item_id': '04390dcbbe0299c17d64926e38fbfe20'}, {'feed_item_id': '8749424a929ca2ed25bb92d6572958df'}, {'feed_item_id': '5d18010f8da43b3d884f680f5f4faa12'}, {'feed_item_id': 'e97a9c67ae9161509e9927da1810585c'}, {'feed_item_id': '7cbb79c8bb3139f4bf7345715c6aca7e'}, {'feed_item_id': '97f30a0949a859eccc18a75d92063730'}, {'feed_item_id': '6f67bd03a7a7b0b8c3a8ea932e0048a6'}, {'feed_item_id': '6665b996b3709228ec9e2b39b127150f'}, {'feed_item_id': '10671b983ca0a93c141bf19ca0ecd95e'}, {'feed_item_id': '2761d64452b777c783f3a4afbd60c71e'}]

这是我能想到的最好的

query = "SELECT v.* FROM (VALUES('" + "'),('".join(map(lambda z: z['feed_item_id'], values)) + "')) v(feed_item_id)  where not exists (select 1 from feed_items ub where ub.feed_item_id = v.feed_item_id::uuid);"

【讨论】：