Question

我想对四张桌子进行查询。

User
Employments
Company
Votes

User和Company通过Employments相关联。 Votes与其他三个实体没有直接关系（例如通过PK和FK）。但Votes与Company间接相关，因为它包含一列company，其字符串值与name Company列相同>

我可以直接在本机SQL中管理查询，但是在Doctrine2中我没有看到任何灯光。

本机SQL中的查询查看此

SELECT 
  c.name AS company, 
  AVG(vo.vote) AS value, 
  COUNT(vo.vote) AS votes,
  em.employees AS employees
FROM company c
 LEFT JOIN employment e ON c.id = e.company_id
 LEFT JOIN user u ON e.user_id = u.id
 LEFT JOIN (SELECT v.company, v.face
            FROM vote v
            WHERE v.gender IS NULL
              AND v.age IS NULL
              AND YEAR( v.timestamp ) = 2013
              AND MONTH( v.timestamp ) = 09
              AND DAY( v.timestamp ) = 26
  ) vo ON vo.company = c.name
  LEFT JOIN (SELECT employment.company_id, COUNT(employment.user_id) AS employees FROM employment GROUP BY employment.company_id) em ON em.company_id = c.id
WHERE u.id = 1
GROUP BY c.name

如上所述：在纯SQL中这很好用。所以我试着翻译＆＃34;这进入DQL：

$subqueryVotes = "SELECT v.company, v.vote
                FROM vote v
                WHERE v.gender IS NULL
                  AND v.age IS NULL
                  AND YEAR( v.timestamp ) = :year
                  AND MONTH( v.timestamp ) = :month
                  AND DAY( v.timestamp ) = :day";

$subqueryEmployeecount = "SELECT employment.company_id, COUNT(employment.user_id) AS employees FROM employment GROUP BY employment.company_id";

$query = $em->createQuery(
    'SELECT
        c.name AS company, 
        AVG(vo.vote) AS value,
        COUNT(vo.vote) AS votes,
        em.employees AS employees
    FROM MyBundle:Company c,
        ('.$subqueryVotes.') vo,
        ('.$subqueryEmployeecount.') em
        LEFT JOIN c.employments e
        LEFT JOIN e.employee u
        WHERE vo.gender IS NULL
            AND vo.age IS NULL
            AND YEAR( vo.timestamp ) = :year
            AND MONTH( vo.timestamp ) = :month
            AND DAY( vo.timestamp ) = :day
        AND u.id = :id
        AND vo.company = c.name
        AND em.company_id = c.id
        GROUP BY c.name'
);

$query->setParameters(array(
    'year'      => $year,
    'month'     => $month,
    'day'       => $day,
    'id'        => $this->getUser()->getId()
));

$result = $query->getArrayResult();

但现在我明白了：

[Semantical Error] line 0, col 149 near '(
SELECT': Error: Class '(' is not defined.

这是因为我的FROM子句中的括号中有子选择。是否允许FROM语句中的子查询？如何更改查询以正确执行？

Answer 1

from语句中的select不由doctrine 2

处理

关于教条jira的封闭（并且未接受）功能请求：http://www.doctrine-project.org/jira/browse/DDC-2793

DQL是关于查询对象的。支持FROM中的子选择   子句意味着DQL解析器无法构建结果集   映射不再（因为子查询返回的字段可能不匹配   对象了。这就是为什么它不能得到支持（支持它   只有在没有水合作用的情况下运行查询的情况是不行的   IMO因为它意味着查询解析需要依赖于   执行模式）。

在您的情况下，最好的解决方案可能是运行SQL查询（因为您正在获得标量，无论如何您都不需要ORM水合作用）

如何在Doctrine2中为FROM语句执行子查询

1 个答案: