cakePHP 3：多连接

Question

我在使用 CakePHP 3.x 处理表之间的关系时遇到了问题。我正在努力在具有 2 个以上级别 realcionamento 的表之间制作 realcionamento。我将介绍关系的代码以及我正在做的查询，以便更清楚地了解什么是行为关系：

class CircuitosTable extends Table{
        public function initialize(array $config)
        {
            $this->table('circuitos');

            $this->addAssociations([
                'belongsTo' => [
                    'Planostreinos' => [
                        'foreignKey' => 'id_plano_treino',
                        'joinType' => 'INNER',
                        'bindingKey' => 'id'
                    ]
                ],
                'hasMany' => [
                    'Atividades' => [
                        'className' => 'Atividades',
                        'foreignKey' => 'id_circuito',
                        'bindingKey' => 'id',
                        'joinType' => 'INNER',
                        'dependent' => false,
                        'cascadeCallbacks' => false,
                        'propertyName' => '_atividades'
                    ],
                ]
            ]);

        }
    }


class AtividadesTable extends Table{
        public function initialize(array $config)
        {
            $this->table('atividades');

            $this->addAssociations([
                'belongsTo' => [
                    'Tiposexercicios' => [
                        'foreignKey' => 'id_tipo_exercicio',
                        'joinType' => 'INNER',
                        'bindingKey' => 'id'
                    ],
                    'Circuitos' => [
                        'foreignKey' => 'id_circuito',
                        'joinType' => 'INNER',
                        'bindingKey' => 'id'
                    ]
                ]
            ]);

        }
    }

class TiposexerciciosTable extends Table{

        public function initialize(array $config)
        {
            $this->table('tipos_exercicios');

            $this->addAssociations([
                'hasMany' => [
                    'Atividades' => [
                        'className' => 'Atividades',
                        'foreignKey' => 'id_tipo_exercicio',
                        'bindingKey' => 'id',
                        'joinType' => 'INNER',
                        'dependent' => false,
                        'cascadeCallbacks' => false,
                        'propertyName' => '_atividades'
                    ]
                ]
            ]);
        }

    }

我正在做这个查询：

$circuitos = $CircuitosTable->find('all', [
                        'conditions' => ['id_plano_treino' => $idPlano], 
                        'contain' => ['Atividades'],
                        'joins' => [
                                        [
                                            "table" => "Tiposexercicios",
                                            "alias" => "TipoExercicio",
                                            "type" => "INNER",
                                            "conditions" => ["TipoExercicio.id = Atividades.id_tipo_exericio"]
                                        ]
                                    ]
                        ]);

预期结果：

Select * From Circuitos
JOIN Atividades on Atividades.id_circuito = Circuitos.id
JOIN Tiposexercicios on Tiposexercicios.id = Atividades.id_tipo_exercicio

提交的查询无法正常工作。应该怎么办？

Answer 1

hasMany 关联正在使用单独的查询进行查询，因此使用 contain() 包含 Atividades 将不会在主查询中包含 table。

看来你想通过关联数据进行过滤，所以你只需使用Query::matching()或Query::innerJoinWith()就可以省去很多麻烦。这将根据需要加入关联的 table。

以下内容将创建一个类似于您正在寻找的查询：

$circuitos = $CircuitosTable
    ->find()
    ->innerJoinWith('Atividades.Tiposexercicios')
    ->where([
        'Circuitos.id_plano_treino' => $idPlano
    ])
    ->group('Circuitos.id');

SELECT 
  -- ...
FROM 
  circuitos Circuitos 
  INNER JOIN atividades Atividades
    ON Circuitos.id = (Atividades.id_circuito) 
  INNER JOIN tipos_exercicios Tiposexercicios
    ON Tiposexercicios.id = (Atividades.id_tipo_exercicio) 
WHERE 
  Circuitos.id_plano_treino = 123
GROUP BY 
  Circuitos.id

分组是必需的，否则您可能会收到重复的结果。

另见 Cookbook > Database Access & ORM > Retrieving Data & Results Sets > Filtering by Associated Data

附带说明一下，连接定义中的 table 键用于保存实际数据库 table 名称，根据您的 table 类 , 是 tipos_exercicios!

cakePHP 3：多连接

cakePHP 3: multi JOIN

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cakephp-3.x