从子查询中选择原则 [英] Doctrine Select from Subquery

问题描述

我正在尝试通过学说运行以下查询:

I am trying to run the following query via doctrine:

$sql = "SELECT league_id, sum(num_fans) AS total_fans FROM ("
."SELECT COUNT(*) as num_fans, t.id AS team_id, l.id AS league_id FROM fan_link fl "
."JOIN team t ON fl.team_id = t.id JOIN League l ON t.league_id = l.id GROUP BY fl.team_id"
.") a GROUP BY league_id LIMIT 0, 3";

$results = $this->em->createQuery($sql)->getScalarResult();

该查询在PHPMyAdmin中工作正常，但是当我尝试在主义中运行它时，出现此错误:

The query works fine in PHPMyAdmin, but when I try to run it in doctrine I get this error:

Doctrine\ORM\Query\QueryException [ 0 ]: 
[Semantical Error] line 0, col 51 near '(SELECT COUNT(*)': 
Error: Class '(' is not defined.

括号在理论查询中是(的保留字符吗?我在 where 子句中有子选择项，但在其他地方都可以正常工作，但在子句中有一个子选择项子句不想工作，我在做什么错了?

Is the parenthesis ( a reserved character in doctrine queries? I have subselects in where clauses elsewhere that work fine, but this one in the from clause doesn't want to work. What am I doing wrong?

更新:
我只是尝试使用查询生成器，并得到了相同的错误.代码:

Update:
I just tried using the query builder and got the same error. Code:

$qb = $this->em->createQueryBuilder();
$leagueQuery = $qb->select('league_id, sum(num_fans) AS total_fans')
    ->from("(SELECT count(*) as num_fans, t.id AS team_id, l.id AS league_id "
    ."FROM fan_link fl "
    ."JOIN team t ON fl.team_id = t.id "
    ."JOIN League l ON t.league_id = l.id GROUP BY fl.team_id)",
    'a')
    ->groupBy("league_id")
    ->orderBy("total_fans", "DESC")
    ->setMaxResults(3)
    ->getQuery();

$results = $leagueQuery->getArrayResult();

推荐答案

最终使用此:

$sql = "SELECT league_id, sum(num_fans) AS total_fans FROM "
    ."(SELECT COUNT(*) as num_fans, t.id AS team_id, l.id AS league_id FROM fan_link fl "
    ."JOIN team t ON fl.team_id = t.id JOIN League l ON t.league_id = l.id GROUP BY fl.team_id"
    .") a GROUP BY league_id LIMIT 0, 3";
$q = $this->em->getConnection();
$league_results = $q->fetchAll($sql);

这篇关于从子查询中选择原则的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！