使用 TypeOrm 执行时，原始 PostgreSQL 查询挂起 [英] A raw PostgreSQL query hangs when executed with TypeOrm

问题描述

我正在执行此更新查询:

I'm making this update query:

await this.userRepository.query(
    `
        update "user" u
        set profile_pic = i.name
        from user_images_image uii
        inner join image i on uii."imageId" = i."id"
        where uii."userId" = u.id and u.id = ${userId} and i.id = ${imageId};
    `,
);

即使我在我的数据库客户端中执行相同的查询并且它按预期工作，它也不会终止.

And it just does not terminate even though I execute the same query in my DB client and it works as expected.

推荐答案

在故障排除会话之后，我们发现查询被锁定，因为另一个连接正在尝试更新相关资源(users 表，带有来自 user_images_image 的外键，用于相同方法的不同事务，两者都在等待提交结果.

After a troubleshooting session we found out that the query was being locked because another connection was trying to update a related resource (a record in a users table with a foreign key from user_images_image) for a different transaction in the same method, both awaiting it's results to commit.

通过使用相同的连接，我们最终得到了正确的行为.

By using the same connection we ended up with the right behaviour.

我们通过使用文档中的锁定监控查询 发现了这一点:

We found that out by using the Lock monitoring query from the docs:

SELECT blocked_locks.pid     AS blocked_pid,
         blocked_activity.usename  AS blocked_user,
         blocking_locks.pid     AS blocking_pid,
         blocking_activity.usename AS blocking_user,
         blocked_activity.query    AS blocked_statement,
         blocking_activity.query   AS current_statement_in_blocking_process,
         blocked_activity.application_name AS blocked_application,
         blocking_activity.application_name AS blocking_application
   FROM  pg_catalog.pg_locks         blocked_locks
    JOIN pg_catalog.pg_stat_activity blocked_activity  ON blocked_activity.pid = blocked_locks.pid
    JOIN pg_catalog.pg_locks         blocking_locks 
        ON blocking_locks.locktype = blocked_locks.locktype
        AND blocking_locks.DATABASE IS NOT DISTINCT FROM blocked_locks.DATABASE
        AND blocking_locks.relation IS NOT DISTINCT FROM blocked_locks.relation
        AND blocking_locks.page IS NOT DISTINCT FROM blocked_locks.page
        AND blocking_locks.tuple IS NOT DISTINCT FROM blocked_locks.tuple
        AND blocking_locks.virtualxid IS NOT DISTINCT FROM blocked_locks.virtualxid
        AND blocking_locks.transactionid IS NOT DISTINCT FROM blocked_locks.transactionid
        AND blocking_locks.classid IS NOT DISTINCT FROM blocked_locks.classid
        AND blocking_locks.objid IS NOT DISTINCT FROM blocked_locks.objid
        AND blocking_locks.objsubid IS NOT DISTINCT FROM blocked_locks.objsubid
        AND blocking_locks.pid != blocked_locks.pid
 
    JOIN pg_catalog.pg_stat_activity blocking_activity ON blocking_activity.pid = blocking_locks.pid
   WHERE NOT blocked_locks.GRANTED;

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