Question

这是Doctrine Repository功能

public function mostReadArticleByUser($userId){
    $total = $this->createQueryBuilder('ar')
        ->select('ar.articleId', 'COUNT(ar)')
        ->where('ar.authorId = :userId')
        ->groupBy('ar.articleId')
        ->orderBy('COUNT(ar)', 'DESC')
        ->setMaxResults(1)
        ->setParameter('userId', $userId)
        ->getQuery()
        ->getResult();

    return $total;
}

应该等同于此查询

SELECT article_id, count(id)
    FROM profile_article_reads
    WHERE author_id = 2
    GROUP BY article_id
    Order by count(id) DESC
    LIMIT 1;

当我执行此代码时，我收到错误

错误：字符串的预期结束，得到'（'

QueryException：SELECT ar.articleId，COUNT（ar）FROM   SciProfileBundle \ Entity \ ProfileArticleReads ar WHERE ar.authorId =   ：userId GROUP BY ar.articleId ORDER BY COUNT（ar）DESC

Answer 1

计数功能接受一个字段，所以尝试使用

COUNT(ar.id)

而不是：

COUNT(ar)

使用别名可能更好地进行排序，例如：

public function mostReadArticleByUser($userId){
    $total = $this->createQueryBuilder('ar')
        ->select('ar.articleId', 'COUNT(ar.id) as total')
        ->where('ar.authorId = :userId')
        ->groupBy('ar.articleId')
        ->orderBy('total', 'DESC')
        ->setMaxResults(1)
        ->setParameter('userId', $userId)
        ->getQuery()
        ->getResult();

    return $total;
}

希望这个帮助

按计数排序时，Doctrine2 DQL语法错误

1 个答案: