Question

我有一个相当复杂的查询，其中包括子查询连接中的SQL计数。

问题是Cake的查询构建器返回23的计数，但我知道这是不正确的。所以我调试了它构建的SQL查询，并直接在MySQL中运行它。奇怪的是，Cake生成的原始SQL是正确的，当我运行它时它会返回1，这也是正确的。

我对于将此称为查询构建器的错误犹豫不决，但似乎Cake解释SQL结果的方式是错误的。我不明白这里有什么问题，或者这是怎么回事。

我已经在这里查询了导致问题的基础知识。

查询对象

这是查询构建器生成的内容。 SQL是正确的。

object(Cake\ORM\Query) {

    '(help)' => 'This is a Query object, to get the results execute or iterate it.',
    'sql' => 'SELECT Orders.order_id AS `Orders__order_id`, all_orders.total AS `Customers__orders_placed`, Customers.id AS `Customers__id`, Customers.email AS `Customers__email`, FROM orders Orders LEFT JOIN (SELECT T.customer_id AS `T__customer_id`, COUNT(*) AS `total` FROM orders T GROUP BY customer_id ) all_orders ON all_orders.T__customer_id = :c0 LEFT JOIN customers Customers ON Customers.id = (Orders.customer_id) WHERE Orders.order_id = :c1',
    'params' => [
        ':c0' => [
            'value' => 'Orders.customer_id',
            'type' => null,
            'placeholder' => 'c0'
        ],
        ':c1' => [
            'value' => '12345',
            'type' => 'string',
            'placeholder' => 'c1'
        ]
    ],

    // ...

Cake生成的SQL（为便于阅读而格式化）

SELECT
    Orders.order_id AS `Orders__order_id`,
    all_orders.total AS `Customers__orders_placed`,
    Customers.id AS `Customers__id`,
    Customers.email AS `Customers__email`,

FROM orders Orders

LEFT JOIN (
    SELECT T.customer_id AS `T__customer_id`,
    COUNT(*) AS `total`
    FROM orders T
    GROUP BY customer_id
) all_orders ON all_orders.T__customer_id = :c0

LEFT JOIN customers Customers ON Customers.id = (Orders.customer_id)

WHERE Orders.order_id = :c1

查询构建器结果

请注意customer->orders_placed = 23

object(App\Model\Entity\Order) {

    'order_id' => '12345',
    'customer' => object(App\Model\Entity\Customer) {

        'orders_placed' => '23',
        'id' => (int) 34727,
        'email' => 'xxxxx@example.com',
        '[new]' => false,
        '[accessible]' => [
            '*' => true
        ],
        '[dirty]' => [],
        '[original]' => [],
        '[errors]' => [],
        '[invalid]' => [],
        '[repository]' => 'Customers'

    },
    '[new]' => false,
    '[accessible]' => [
        '*' => true
    ],
    '[errors]' => [],
    '[invalid]' => [],
    '[repository]' => 'Orders'

}

如果我自己在MySQL中运行查询

我从Cake的SQL中唯一更改的是填写:c0和:c1的参数。

SELECT
    Orders.order_id AS `Orders__order_id`,
    all_orders.total AS `Customers__orders_placed`,
    Customers.id AS `Customers__id`,
    Customers.email AS `Customers__email`

FROM orders Orders

LEFT JOIN (
    SELECT T.customer_id AS `T__customer_id`,
    COUNT(*) AS `total`
    FROM orders T
    GROUP BY customer_id
) all_orders ON all_orders.T__customer_id = Orders.customer_id

LEFT JOIN customers Customers ON Customers.id = (Orders.customer_id)

WHERE Orders.order_id = 12345

然后当我在MySQL中运行它时，结果是：

Orders__order_id | Customers__orders_placed | Customers__id | Customers__email
-------------------------------------------------------------------------------
12345            | 1                        | 34727         | xxxxx@example.com

当我真的复制/粘贴Cake生成的SQL时，计数怎么会有所不同？

Cake版本是3.3.16

CakePHP 3 - 查询COUNT（）返回错误的数字

0 个答案: