连接表 CakePHP

Question

我有一个 table batch_detail_process 有外键 batch_detail_id 并且它在模型中与 belongsTo 连接。现在我想根据 article_id & item_id.

获取 ArticleRatio

我的table外键如下：

batch_details_processes = id, batch_detail_id

batch_details = id, batch_id, item_id

批次=id，article_id，

article_ratios = id, article_id, item_id,比率

$conditions = array();

$conditions['joins'] = array(
                array(
                    'table' => 'batches',
                    'alias' => 'Batch',
                    'type' => 'LEFT',
                    'conditions' => array(
                        'Batch.id = BatchDetail.batch_id'
                    )
                ),
                array(
                    'table' => 'article_ratios',
                    'alias' => 'ArticleRatio',
                    'type' => 'LEFT',
                    'conditions' => array(
                        'ArticleRatio.article_id = Batch.article_id',
                        'ArticleRatio.item_id = BatchDetail.item_id'
                    )
                )
            );

        $bdp = $this->BatchDetailsProcess->find('all',$conditions);

pr($bdp);

return 如下：

SQL 由它生成：

SELECT  `BatchDetailsProcess`.`id`, `BatchDetailsProcess`.`batch_detail_id`,
        `BatchDetailsProcess`.`qty_in`, `BatchDetailsProcess`.`qty_out`,
        `BatchDetailsProcess`.`process_step_id`, `BatchDetailsProcess`.`qc_test`,
        `BatchDetailsProcess`.`qc_note`, `BatchDetailsProcess`.`qc_accept`,
        `BatchDetailsProcess`.`qc_reject`, `BatchDetailsProcess`.`moved_further`,
        `BatchDetailsProcess`.`assigned_to`, `BatchDetailsProcess`.`receive_confirmation`,
        `BatchDetailsProcess`.`created_by`, `BatchDetailsProcess`.`updated_by`,
        `BatchDetailsProcess`.`created`, `BatchDetailsProcess`.`updated`,
        `BatchDetail`.`id`, `BatchDetail`.`batch_id`, `BatchDetail`.`po_transaction_id`,
        `BatchDetail`.`current_position`, `BatchDetail`.`out_date`,
        `BatchDetail`.`item_id`, `ProcessStep`.`id`, `ProcessStep`.`article_id`,
        `ProcessStep`.`production_step_id`, `ProcessStep`.`sequence`,
        `ProcessStep`.`rate_per`, `ProcessStep`.`amount_per`
    FROM  `star_impact`.`batch_details_processes` AS `BatchDetailsProcess`
    LEFT JOIN  `star_impact`.`batch_details` AS `BatchDetail`
           ON (`BatchDetailsProcess`.`batch_detail_id` = `BatchDetail`.`id`)
    LEFT JOIN  `star_impact`.`process_steps` AS `ProcessStep`
           ON (`BatchDetailsProcess`.`process_step_id` = `ProcessStep`.`id`)
    LEFT JOIN  `star_impact`.`batches` AS `Batch`
           ON (`Batch`.`id` = `BatchDetail`.`batch_id`)
    LEFT JOIN  `star_impact`.`article_ratios` AS `ArticleRatio`
           ON (`ArticleRatio`.`article_id` = `Batch`.`article_id`
              AND  `ArticleRatio`.`item_id` = `BatchDetail`.`item_id`
                          )
    WHERE  1 = 1

我想 select 文章比率基于匹配 article_id & item_id。但结果没有 return ArticleRatio，只有 BatchDetailProcess、BatchDetail 和 ProcessStep。

Answer 1

results doesn't return the ArticleRatio

联接不是关联。

CakePHP 的 ORM 不发出 SELECT * 查询，字段总是指定的，所以从问题：

SELECT 
    ... <- No ArticleRatio here 
FROM 
    `star_impact`.`batch_details_processes` AS `BatchDetailsProcess` 
...
WHERE 
    1 = 1

如果 select 中没有提及，将不会有来自联接 table 的字段 returned，并且那些 tables 中没有 CakePHP 的数据.

或者：

指定查询中的字段

与其让 CakePHP 决定要 return 哪些字段，不如指定它们：

$conditions['fields'] = '*';
$bdp = $this->BatchDetailsProcess->find('all',$conditions);

SELECT 
    * <- Lazy, all fields. Or be more specific with 'fields'
FROM 
    `star_impact`.`batch_details_processes` AS `BatchDetailsProcess` 
...
WHERE 
    1 = 1

注意要查找的第二个参数是parameters不是条件

或：

使用关联。

使用临时 associations:

而不是连接

$this->BatchDetailsProcess->bindModel('hasOne', [
    'Batch' =>  [
        'conditions' => [
            'Batch.id = BatchDetail.batch_id'
        ]
    ],
    'ArticleRatio' => [
        'conditions' => [
            'ArticleRatio.article_id = Batch.article_id',
            'ArticleRatio.item_id = BatchDetail.item_id'
        ]
    ]
]);
$this->BatchDetailsProcess->find();

这将创建一个左连接，并在响应中添加填充 fields/entities；调整传递给关联定义的参数（并使用 containable）以适应。

连接表 CakePHP

Joining tables CakePHP

mysql

cakephp

join

cakephp-2.8

联接不是关联。

指定查询中的字段

使用关联。