我有两个不同的表 - 一个称为“产品”,其中包含有关在线商店的产品信息,另一个表称为“图像”,其中包含相应的产品图像(每个产品有几个图像)。 我想在主表“products”上加入表“images”,并以JSON格式输出结果。
表“products”如下所示(简化):
id | name
----|--------
57 | apple
58 | tomato
59 | ...
产品图片的表格“图片”:
img_id | img | p_id | listorder
-------|-------------|------|----------
32 | apple1.jpg | 57 | 1
33 | apple2.jpg | 57 | 2
34 | tomato1.jpg | 58 | 1
35 | ... | ... | ...
到目前为止,我的查询是这样的:
$sql = "SELECT
p.id as p_id,
p.name as p_name,
i.*
FROM products p
JOIN (SELECT * FROM images WHERE listorder=1)
AS i ON (i.p_id = p.id)";
因此输出(在将数据提取到数组并转换为JSON之后)看起来像这样:
[{
"id": "57",
"name": "apple",
"img": "apple1.jpg"
}, {
"id": "58",
"name": "tomato",
"img": "tomato1.jpg"
}]
所以我的问题是:如何输出以下内容?
[{
"id": "57",
"name": "apple",
"img": [{"img_id": "32","img": "apple1.jpg"}, {"img_id": "33","img": "apple2.jpg"}]
}, {
"id": "58",
"name": "tomato",
"img": [{"img_id": "34","img": "tomato1.jpg"}]
}]
答案 0 :(得分:1)
SELECT
p.id as p_id,
p.name as p_name,
group_concat(concat('{"img_id":"',i.img_id,'"img":"',i.img,'"}') separator ',') as img
FROM products p
JOIN (SELECT * FROM images WHERE listorder=1)
AS i ON (i.p_id = p.id)
GROUP BY p.id,p.name
答案 1 :(得分:-1)