Question

我有一个有效的SQL查询我想弄清楚CakePHP查询构建器的等效工作方式完全相同吗？

SELECT customers.*, customer_reps.created FROM customers
LEFT JOIN customer_reps ON customer_reps.id =
    (
    SELECT id FROM customer_reps WHERE customer_id = customers.id
    ORDER BY id ASC LIMIT 1
    )
WHERE created >= 1475298000
AND created <= 1476217836
AND agents_id = 4

基本上我从“客户”中选择所有列，然后我只想要第一个“customer_reps”表的“创建”时间戳字段来匹配客户。

关于CakePHP的文档似乎没有解释如何在select中进行select以进行排序。我尝试使用“hasMany”关系的东西，但我无法找到如何只是获取“第一个”customer_reps条目添加到主要查询以便在WHERE子句中使用。

由于

Answer 1

尝试使用此代码作为起点，您只需要按CustomerRep.customer_id对其进行分组，因为如果您的customer_reps表ID已自动递增，则订单已经提升

    $this->Customer->find('all', array(
        'fields' => arrray(
            'Customer.*',
            'CustomerRep.created'
            ),
        'joins' => array(
             array(
                 'type' => 'LEFT',
                 'table' => 'customer_reps',
                 'alias' => 'CustomerRep',
                 'conditions' => 'Customer.id = CustomerRep.customer_id'
                )
            )
        'conditions' => array(
            'Customer.created >=' => '1475298000',
            'Customer.created <=' => '1476217836',
            'Customer.agentds_id' => 4
            ),
        'group' => 'CustomerRep.customer_id'
    ));

Answer 2

你熟悉cakephp查询构建器吗？如果是的话你应该理解这个流程

第1步：cakephp中的SELECT customers.*, customer_reps.created FROM customers等价物是

$this->Customer->find('all', array(
    'fields' => array(
        'Customer.*',
        'CustomerReply.created'
    )
);

注意：CustomerReply.created来自customer_reps的联接表，我只是别名CustomerReply

第2步：cakephp中的LEFT JOIN customer_reps ON customer_reps.id = ( SELECT id FROM customer_reps WHERE customer_id = customers.id ORDER BY id ASC LIMIT 1 )等效项

'joins' => array(
    array(
        'table' => 'customer_reps',
        'type' => 'left',
        'alias' => 'CustomerReply',
        'conditions' => array(
            'CustomerReply.id = (SELECT id FROM customer_reps WHERE customer_id = Customer.id ORDER BY id ASC LIMIT 1)'
        )
    ))

第3步：cakephp中的WHERE created >= 1475298000 AND created <= 1476217836 AND agents_id = 4等价物是

    'conditions' => array(
            'Customer.created >=' => 1475298000,
            'Customer.created <=' => 1476217836,
            'Customer.agents_id' => 4
            )
        );

所以你的cakephp查询构建器就像这样

$query = $this->Customer->find('all', array(
    'fields' => array(
        'Customer.*',
        'CustomerReply.created'
        ),
    'joins' => array(
        array(
            'table' => 'customer_reps',
            'type' => 'left',
            'alias' => 'CustomerReply',
            'conditions' => array(
                'CustomerReply.id = (SELECT id FROM customer_reps WHERE customer_id = Customer.id ORDER BY id ASC LIMIT 1)'
            )
        )),
    'conditions' => array(
        'Customer.created >=' => 1475298000,
        'Customer.created <=' => 1476217836,
        'Customer.agents_id' => 4
        )
    ));

cakephp从排序和有限行

2 个答案: