symfony2 & 学说 orderBy/DQL 错误

Question

我定义了 2 个实体：

• 国家实体
• 城市实体

我正在尝试选择州实体并自动加入城市实体并按州名称对结果进行排序。但是，我收到此错误：

[Syntax Error] line 0, col 74: Error: Expected Literal, got 'BY' 

我创建查询的代码是：

$statesQuery = $this->getEm()->createQueryBuilder();
$statesQuery->select("st");
$statesQuery->from("CoreBundle:State", "st");
$statesQuery->leftJoin("CoreBundle:City", "ct");
$statesQuery->addSelect("ct");
$statesQuery->orderBy("st.name", "ASC");

$statesQuery = $statesQuery->getQuery();

$states = $statesQuery->getResult();

如果我通过方法删除订单，我会收到以下错误：

[Syntax Error] line 0, col -1: Error: Expected Doctrine\ORM\Query\Lexer::T_WITH, got end of string. 

DQL 生成的查询（带有 order By 和 w/o orderBy）：

SELECT st, ct FROM CoreBundle:State st LEFT JOIN CoreBundle:City ct ORDER BY s.name ASC

SELECT st, ct FROM CoreBundle:State st LEFT JOIN CoreBundle:City ct

国家实体：

Ec\CoreBundle\Entity\State:
    type: entity
    table: states
    id:
        id:
            type: integer
            nullable: false
            unsigned: false
            comment: ''
            id: true
            generator:
                strategy: IDENTITY
    fields:
        name:
            type: string
            nullable: false
            length: 255
        friendly_url:
            type: string
            nullable: false
            length: 255
    oneToMany:
        cities:
            targetEntity: City
            mappedBy: state
    oneToOne:
        country:
            targetEntity: Country
    lifecycleCallbacks: {  }

以及城市实体：

Ec\CoreBundle\Entity\City:
    type: entity
    table: cities
    id:
        id:
            type: integer
            nullable: false
            unsigned: false
            comment: ''
            id: true
            generator:
                strategy: IDENTITY
    fields:
        name:
            type: string
            nullable: false
            length: 255
        friendly_url:
            type: string
            nullable: false
            length: 255
    manyToOne:
        state:
            targetEntity: State
            inversedBy: cities
    lifecycleCallbacks: {  }

Answer 1

如果你想检索一个州的集合（和相关的城市），这就足够了：

// src/AcmeBundle/Controller/MyController.php
// ...

$statesQuery = $this->getDoctrine()->getManager()->createQueryBuilder();
$statesQuery->select("st")
            ->from("CoreBundle:State", "st")
            ->orderBy("st.name", "ASC");

$states = $statesQuery->getQuery()
                      ->getResult();

所以城市将被延迟加载。有关延迟/急切加载的更多信息，请查看doctrine2 doc

编辑： 好的，如果您只在一个地方需要它，只需执行以下操作：

$statesQuery = $this->getDoctrine()->getManager()->createQueryBuilder();
$statesQuery->select("st, ct")
            ->from("CoreBundle:State", "st")
            ->leftJoin("st.cities", "ct")
            ->orderBy("st.name", "ASC");

$states = $statesQuery->getQuery()
                      ->getResult();