我在 Postgres 中使用 Sequelize 3.30.0。这是我要执行的查询:
SELECT works.title, artists.name, artists.relevance
FROM works
JOIN artist_works ON works.work_id = artist_works.work_id
JOIN artists ON artists.artist_id = artist_works.artist_id
WHERE artists.label LIKE '%mozart%'
ORDER BY artists.relevance DESC
LIMIT 50
如果我直接在 db 上执行它,它非常简单并且效果很好。但是,尝试对 Sequelize 执行相同操作似乎不起作用(没有结果)。这是
findAll
选项的样子:Work.findAll({
attributes : ['title'],
include : [{
attributes : [ 'name' ],
model : Artist,
where : { label : { $like : '%mozart%' } },
}],
limit : 50
})
Sequelize 生成的查询非常复杂:
SELECT "works".*, "artists"."artist_id" AS "artists.artistId", "artists"."name" AS "artists.name", "artists.artist_works"."artist_work_id" AS "artists.artist_works.artistWorkId", "artists.artist_works"."artist_id" AS "artists.artist_works.artistId", "artists.artist_works"."work_id" AS "artists.artist_works.workId", "artists.artist_works"."type" AS "artists.artist_works.type", "artists.artist_works"."artist_id" AS "artists.artist_works.artist_id", "artists.artist_works"."work_id" AS "artists.artist_works.work_id"
FROM (
SELECT "works"."work_id" AS "workId", "works"."title"
FROM "works" AS "works"
WHERE (
SELECT "artist_works"."artist_work_id"
FROM "artist_works" AS "artist_works"
INNER JOIN "artists" AS "artist" ON "artist_works"."artist_id" = "artist"."artist_id"
WHERE ("works"."work_id" = "artist_works"."work_id") LIMIT 1
) IS NOT NULL
LIMIT 50) AS "works"
INNER JOIN (
"artist_works" AS "artists.artist_works"
INNER JOIN "artists" AS "artists" ON "artists"."artist_id" = "artists.artist_works"."artist_id"
) ON "works"."workId" = "artists.artist_works"."work_id" AND "artists"."label" LIKE '%-mozart-%';
请注意,如果未设置限制,则查询有效。
此外,当我还尝试添加
order
选项时,查询会卡住。想法?
最佳答案
存在相关问题 Sequelize with NodeJS can't join tables with limit ,解决方案似乎是将 subQuery: false
添加到 options
方法中的 findAll
对象。它可以防止创建与您相关的子查询。
我创建了相同的关联并添加了 subQuery: false
并且没有生成子查询,而且 LIMIT
和 ORDER
似乎可以工作。但是,如果您真的想使用 selectQuery
选项,我建议从 node_modules/sequelize/lib/dialects/abstract/query-generator.js
查看 subQuery
的源代码,因为文档中没有提到它,所以我不保证它会起作用
关于node.js - Sequelize PG : select with join, 订单,限制,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42248918/