Question

查询代码

 SELECT * FROM products 
              LEFT JOIN (SELECT * FROM product_images ) as images ON products.id = images.productId
              LEFT JOIN (SELECT * FROM product_shippings ) as shipping ON products.id = shipping.productId
              WHERE products.id = :productID

product_images中有多张图像，但是它只返回一个实例。

我想做的是将它们全部存储在一个关联数组中，例如包含图像列表的图像，包含装运项目列表的装运等。

我知道如何使用单独的查询来实现这一点，但是根据我的基准测试，这太慢了。

所以我想要类似

 {
images:[...],
shipping[...],
productId:2,
productTitle:'Hello'
}

如何解决此问题？

Answer 1

SELECT *
    FROM products 
    LEFT JOIN product_images as images      ON products.id = images.productId
    LEFT JOIN product_shippings as shipping ON products.id = shipping.productId
    WHERE products.id = :productID

或者，为了得到逗号（而不是“数组”）

SELECT  p.id, p.title,
        GROUP_CONCAT(i.image) AS images,
        GROUP_CONCAT(s.shipping) AS shippings
    FROM products AS p
    LEFT JOIN product_images AS i     ON p.id = i.productId
    LEFT JOIN product_shippings AS s  ON p.id = s.productId
    WHERE p.id = :productID

Answer 2

如果您拿走GROUP BY，您将在WHERE子句中获得product.id的所有图像。

如何获得查询以在MYSQL中返回数组？

2 个答案: