php - 从数据库中的产品生成 JSON，只取最后一行

Question

列在名为“products”的表中是这样设置的

+------------++---------------++----------------------++---------------++----------------+
| product_id  | product_name   | product_description   |  product_image |  product_price |
+------------++---------------++----------------------++---------------++----------------+
|      1      |     a1         |    good               |     url.jpg    |     150dkk     |
+------------++---------------++----------------------++---------------++----------------+
|      2      |     a2         |    nice               |     url.jpg    |     150dkk     |
+------------++---------------++----------------------++---------------++----------------+

这是我的代码，所以我循环遍历我的产品表并将它们推送到一个将是 JSON 的数组中。

    //Create an array
    $json_response = json_decode('{"products":[]}');

    $sql = "SELECT * FROM products";
    $result = $conn->query($sql);
    while($row = mysqli_fetch_array($result)){
    $row_array['id'] = $row['product_id'];
    $row_array['name'] = $row['product_name'];
    $row_array['description'] = $row['product_description'];
    $row_array['image'] = $row['product_image'];
    $row_array['price'] = $row['product_price'];
}
    // Push the columns into the created array
    array_push($json_response->products, $row_array);

    // Encode into an object
    $oJsonResponse = json_encode($json_response);

    // Save it in a new file that holds the json from MySQL
    file_put_contents('products.json', $oJsonResponse);

问题是我只能设法将 ID 为 2 的产品放入我的 json 文件中，因此第一个产品永远不会保存在 .json 文件中。当我执行 echo = "$row[product_name]"; - 我得到两种产品

Answer 1

开始吧(将 array_push 移入 while 循环)

<?php

//Create an array
$json_response = array();

$sql = "SELECT * FROM products";
$result = $conn->query($sql);
while ($row = mysqli_fetch_array($result)) {
    $row_array['id'] = $row['product_id'];
    $row_array['name'] = $row['product_name'];
    $row_array['description'] = $row['product_description'];
    $row_array['image'] = $row['product_image'];
    $row_array['price'] = $row['product_price'];

    // Push the columns into the created array
    $json_response[] = $row_array;
}

// Encode into an object
$oJsonResponse = json_encode($json_response);

// Save it in a new file that holds the json from MySQL
file_put_contents('products.json', $oJsonResponse);