mysql 到 json 使用 php。 嵌套对象

Question

下午好，我正在尝试将这些结果输入 PHP 中的 arrays 以便我可以将它们编码为 json 对象并将它们发送给客户端。 查询结果如下所示：

   id   name    hours   cat status
3bf JFK Int 24  pass    open
3bf JFK Int 24  std closed
3bf JFK Int 24  exp open
5t6 Ohm CA  18  pass    closed
5t6 Ohm CA  18  std closed
5t6 Ohm CA  18  std2    open
5t6 Ohm CA  18  exp open
...

我希望 json 对象看起来像这样：

{ "id": "3bf", "name": "JFK Int", "cats":
    { [ { "cat": "pass", "status": "open" },
        { "cat": "std", "status": "closed" },
        { "cat": "exp", "status": "open" } ] }
{ "id": "5t6", "name": "Ohm CA", "cats":
    { [ { "cat": "pass", "status": "closed" },
        { "cat": "std", "status": "closed" },
        { "cat": "std2", "status": "open" } ],
        { "cat": "exp", "status": "open" } ] }

我已成功连接到 mysql 并使用 json_encode 使用平面表导出，但这部分我不知道如何在 PHP 中执行。 谢谢。

这是我拥有的代码。 这将返回一个 json 对象数组，但它是扁平的，不是嵌套的：

$SQL = "SELECT id, name, hours, cat, status FROM bwt.vewPortCats";

$result = mysql_query($SQL);

$arr = array();
    while ($row = mysql_fetch_assoc($result)) {
        $arr[] = $row;}

$json = json_encode($arr);

echo $json;

数据本身来自结合了表端口和猫的视图。

Answer 1

你能做什么（对不起，不是我写的最好的代码......时间短，想法和精力;-)就是这样的（我希望它仍然传达了这一点）：

$SQL = "SELECT id, name, hours, cat, status FROM bwt.vewPortCats";

$result = mysql_query($SQL);

$arr = array();
    while ($row = mysql_fetch_assoc($result)) {

        // You're going to overwrite these at each iteration, but who cares ;-)
        $arr[$row['id']]['id'] = $row['id'];
        $arr[$row['id']]['name'] = $row['name'];

        // You add the new category
        $temp = array('cat' => $row['cat'], 'status' => $row['status']);

        // New cat is ADDED
        $arr[$row['id']]['cats'][] = $temp;
    }


$base_out = array();

// Kind of dirty, but doesn't hurt much with low number of records
foreach ($arr as $key => $record) {
    // IDs were necessary before, to keep track of ports (by id), 
    // but they bother json now, so we do...
    $base_out[] = $record;
}

$json = json_encode($base_out);

echo $json;

没有时间对它进行测试或三思而后行，但我希望它能传达出这个想法......

Answer 2

感谢@maraspin，我得到了以下代码：

function merchantWithProducts($id)
    {
        if (
            !empty($id)
        ) {

            //select all query
            $query = "SELECT
                     m.id as 'mMerchantID', m.name as 'merchantName', m.mobile, m.address, m.city, m.province,
                     p.id as 'ProductID', p.merchantId as 'pMerchantID', p.category, p.productName, p.description, p.price, p.image, p.ratingCount 
                FROM " . $this->table_name . " m 
                JOIN by_product p 
                ON m.id = p.merchantId 
                WHERE m.id = :id 
                GROUP BY m.id";

            // prepare query statement
            $stmt = $this->conn->prepare($query);

            // sanitize
            //  $this->id = htmlspecialchars(strip_tags($this->id));

            // bind values
            $stmt->bindParam(":id", $this->id);

            try {
                $success = $stmt->execute();

                if ($success === true) {

                    $results = $stmt->fetchAll();
                    
                    $this->resultToEncode = array();

                    foreach ($results as $row) {
                       
                        $objItemArray = array(
                            "merchantID" => $row->mMerchantID,
                            "merchantName" => $row->merchantName,
                            "mobile" => $row->mobile,
                            "address" => $row->address,
                            "city" => $row->city,
                            "province" => $row->province, 
                            "product" => array(
                                "productID" => $row->ProductID,
                                "pMerchantID" => $row->pMerchantID,
                                "category" => $row->category,
                                "productName" => $row->productName,
                                "description" => $row->description,
                                "price" => $row->price,
                                "image" => $this->baseUrl . 'imagesProducts/' . $row->image,
                                "ratingCount" => $row->ratingCount
                            )
                        );

                        
                        array_push($this->resultToEncode, $objItemArray);
                    }

                    http_response_code(200);
                    $httpStatusCode = '200 OK';
                    $pass = true;

                    // return json_encode($resultToEncode);
                } else {
                    http_response_code(204);
                    $httpStatusCode = '204 No Content';
                    $pass = false;
                    $this->resultToEncode = 'No Record Found';
                }
            } catch (PDOException $pdoEx) {
                http_response_code(500); // internal server error.
                $httpStatusCode = '500 Internal Server Error';
                $pass = false;
                $this->resultToEncode = $pdoEx->getCode();
            } catch (Exception $ex) {
                // return $ex->getMessage();
                http_response_code(404); // 404 Not Found.
                $httpStatusCode = '404 Not Found';
                $pass = false;
                $this->resultToEncode = $ex->getMessage();
            }
        } else {
            http_response_code(400);
            $httpStatusCode = '400 bad request';
            $pass = false;
            $this->resultToEncode = 'User id not specified';
        }
        echo json_encode(array('passed' => $pass, 'Response' => $httpStatusCode, 'result' => $this->resultToEncode));
    }