douduan3203 2018-09-08 08:32
浏览 265
已采纳

如何从mysqli中获取json对象/数组(所有匹配的行)没有索引

i spent lot of hours trying to figure out the right way to output json array/object from mysql database like this :

expected output 
    {
        "ITEM1": 20,
        "ITEM2": 15,
        "ITEM3": 12
    }

As each key/value pair corresponding to one mysql table row (no need to display ID column).

id |item| price

This is my current code using MYSQLND driver on debian:

<?php
header('Content-Type: application/json');

$servername = "localhost";
$username = "root";
$password = "pswd";
$dbname = "json";


$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}


$itemInitArr = array();
$decharge = 0;
$stmt = $conn->prepare("SELECT item, price FROM stock WHERE total_sold = ?");
$stmt->bind_param("i", $decharge);
$stmt->execute();
$result = $stmt->get_result();


                            while ($itemInit = $result->fetch_assoc())
                            {
                                $itemInitArr[] = array (
                                            $itemInit['item'] => $itemInit['price']
                                    );
                            }
$stmt->close();                         
$final_data = json_encode($itemInitArr, JSON_PRETTY_PRINT); 
echo $final_data;

$conn->close();
?>

which output this :

[
    {
        "ITEM1": 20
    },
    {
        "ITEM2": 15
    },
    {
        "ITEM3": 12
    }
]

So, where is the mistake and how to solve it to match expected output ?

  • 写回答

3条回答 默认 最新

  • dqrsceg6279196 2018-09-08 08:40
    关注

    If you change the way you build your array to...

    $itemInitArr[$itemInit['item']] =  $itemInit['price'];
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(2条)

报告相同问题?

悬赏问题

  • ¥15 数学的三元一次方程求解
  • ¥20 iqoo11 如何下载安装工程模式
  • ¥15 本题的答案是不是有问题
  • ¥15 关于#r语言#的问题:(svydesign)为什么在一个大的数据集中抽取了一个小数据集
  • ¥15 C++使用Gunplot
  • ¥15 这个电路是如何实现路灯控制器的,原理是什么,怎么求解灯亮起后熄灭的时间如图?
  • ¥15 matlab数字图像处理频率域滤波
  • ¥15 在abaqus做了二维正交切削模型,给刀具添加了超声振动条件后输出切削力为什么比普通切削增大这么多
  • ¥15 ELGamal和paillier计算效率谁快?
  • ¥15 蓝桥杯单片机第十三届第一场,整点继电器吸合,5s后断开出现了问题