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如何在while循环中对ID进行分组（适用于php json_encode）

[英]How to group ID in while loop (for php json_encode)

 原文  2018-03-30 20:56:13  2   1    php/ mysql/ arrays/ json/ loops

问题描述

我有几天要用MySQL数据创建Json数组的问题

这是我的MySQL资料： 

zi  zn         vn                       pioo     pio     ve    station    es       eo  

 1  Zone 1     Value 01                  1     199       0        1       1         0
 1  Zone 1     Value 02                 54     637       0        3       0         0
 1  Zone 1     Value 03                 55     637       1        3       0         0
 2  Zone 2     Value 01                  1     199       0        1       1         0
 2  Zone 2     Value 03                 55     637       1        3       0         0
 2  Zone 2     Value 04                 56     642       0        3       0         0
 3  Zone 3     Value 01                  1     199       0        1       1         0
 3  Zone 3     Value 05                 57     647       1        3       0         0
 4  Zone 4     Value 05                 57     647       1        3       0         0
 5  Zone Test  Value 02                 54     637       0        3       0         0
 5  Zone Test  Value 03                 55     637       1        3       0         0

这是我的PHP代码：

我的查询是$ query，我的SQL连接是$ con 

$result = array();
$json_response = array();
$response = array();


if($stmt = $con->prepare($query)){
    $stmt->execute();

    $stmt->bind_result($zoneId,$zoneName,$vanneName,$piooId,$pioId,$vanne_etat,$station,$etat_station,$etat_ordre);

    while($stmt->fetch()){


            $json_response = [
                    'zi' => $zoneId,
                'zn' => $zoneName,
                $vanneName => [],
            ];

        $json_response[$vanneName][] = [
            'pioo' => $piooId,
            'pio' => $pioId,
            've' => $vanne_etat,
            'es' => $etat_station,
            'eo' => $etat_ordre,
        ];



    $data = [];
    foreach ($json_response as $element) {
        $data[] = $element;
    }

        $result[]=$json_response;


    }
    $stmt->close();


    $online = mysqli_fetch_array(mysqli_query($con, "SELECT CASE WHEN TIMESTAMP > DATE_SUB(NOW(), INTERVAL 5 MINUTE) THEN 1 ELSE 0 END AS online FROM relevés_instantanés ORDER BY ID DESC LIMIT 1")) ['online'];
    $response["online"] = $online;
    $response["success"] = 1;
    $response["data"] = $result;


}else{
    //Errors
    $response["success"] = 0;
    $response["message"] = mysqli_error($con);


}

mysqli_close($con);
echo json_encode($response);

像这样输出Json： 

{
   "online":"1",
   "success":1,
   "data":[
      {
         "zi":1,
         "zn":"Zone 1",
         "Value 01":[
            {
               "pioo":1,
               "pio":199,
               "ve":0,
               "es":1,
               "eo":0
            }
         ]
      },
      {
         "zi":1,
         "zn":"Zone 1",
         "Value 02":[
            {
               "pioo":54,
               "pio":637,
               "ve":0,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":1,
         "zn":"Zone 1",
         "Value 03":[
            {
               "pioo":55,
               "pio":637,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":2,
         "zn":"Zone 2",
         "Value 01":[
            {
               "pioo":1,
               "pio":199,
               "ve":0,
               "es":1,
               "eo":0
            }
         ]
      },
      {
         "zi":2,
         "zn":"Zone 2",
         "Value 03":[
            {
               "pioo":55,
               "pio":637,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":2,
         "zn":"Zone 2",
         "Value 04":[
            {
               "pioo":56,
               "pio":642,
               "ve":0,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":3,
         "zn":"Zone 3",
         "Value 01":[
            {
               "pioo":1,
               "pio":199,
               "ve":0,
               "es":1,
               "eo":0
            }
         ]
      },
      {
         "zi":3,
         "zn":"Zone 3",
         "Value 05":[
            {
               "pioo":57,
               "pio":647,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":4,
         "zn":"Zone 4",
         "Value 05":[
            {
               "pioo":57,
               "pio":642,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":5,
         "zn":"Zone Test",
         "Value 02":[
            {
               "pioo":54,
               "pio":637,
               "ve":0,
               "es":0,
               "eo":0
            }
         ]
      },
      {
         "zi":5,
         "zn":"Zone Test",
         "Value 03":[
            {
               "pioo":55,
               "pio":637,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      }
   ]
}

但我希望这样的输出：（我不确定语法，但这是让您了解我的意愿的。） 

{
   "online":"1",
   "success":1,
   "data":[
      {

         "zi":1,
         "zn":"Zone 1"{
         "Value 01":[
                {
                   "pioo":1,
                   "pio":199,
                   "ve":0,
                   "es":1,
                   "eo":0
                }
             ]
             "Value 02":[
                {
                   "pioo":54,
                   "pio":637,
                   "ve":0,
                   "es":0,
                   "eo":0
                }
             ]
             "Value 03":[
                {
                   "pioo":55,
                   "pio":637,
                   "ve":1,
                   "es":0,
                   "eo":0
                }
             ]
          },


      {
         "zi":2,
         "zn":"Zone 2"{
         "Value 01":[
            {
               "pioo":1,
               "pio":199,
               "ve":0,
               "es":1,
               "eo":0
            }
         ]
         "Value 03":[
            {
               "pioo":55,
               "pio":637,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]

         "Value 04":[
            {
               "pioo":56,
               "pio":642,
               "ve":0,
               "es":0,
               "eo":0
            }
         ]
      },

      {
         "zi":3,
         "zn":"Zone 3"{
         "Value 01":[
            {
               "pioo":1,
               "pio":199,
               "ve":0,
               "es":1,
               "eo":0
            }
         ]
         "Value 05":[
            {
               "pioo":57,
               "pio":647,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      },


      {
         "zi":4,
         "zn":"Zone 4"{
         "Value 05":[
            {
               "pioo":57,
               "pio":642,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      },


      {
         "zi":5,
         "zn":"Zone Test"{
         "Value 02":[
            {
               "pioo":54,
               "pio":637,
               "ve":0,
               "es":0,
               "eo":0
            }
         ]
         "Value 03":[
            {
               "pioo":55,
               "pio":637,
               "ve":1,
               "es":0,
               "eo":0
            }
         ]
      }
   ]
}

我无法隔离区域的每个ID来正确构建我的JSON...。

是否可以在while循环中使用一次每个ID？

任何帮助表示赞赏

对不起，我英语不好..：S

乔尔

1 个解决方案

解决方案1
 0 已采纳  2018-03-30 21:49:36

好的，这就是我要做的。 它的结构略有不同，但是使构建起来更容易。

而且我没有使用数据库，所以我将使用这个固定数组 

 $a = [
    [
        "zi"        => "1",
        "zn"        => "Zone 1",
        "vn"        => "Value 01",
        "pioo"      => "1",
        "pio"       => "199",
        "ve"        => "0",
        "station"   => "1",
        "es"        => "1",
        "eo"        => "0"
    ],  [
        "zi"        => "1",
        "zn"        => "Zone 1",
        "vn"        => "Value 02",
        "pioo"      => "54",
        "pio"       => "637",
        "ve"        => "0",
        "station"   => "3",
        "es"        => "0",
        "eo"        => "0"
    ],[
        "zi"        => "2",
        "zn"        => "Zone 2",
        "vn"        => "Value 04",
        "pioo"      => "56",
        "pio"       => "642",
        "ve"        => "0",
        "station"   => "3",
        "es"        => "0",
        "eo"        => "0"
    ]
 ];

在下面我有foreach地方，只要数据在每行$data ，就可以用数据库中的while循环替换，这应该没问题。 

  $output = [
      "online" => 0,
      "success" => 0,
      "data" => []
   ];

 foreach($a as $data){ 
   //replace foreach with while from the DB
   //eg. while(false != ($data = $stmt->fetch_assoc())){


    $zone = "zone_{$data['zi']}";
    if(!isset($output['data'][$zone])){
        //setup the zone first time we see it
        $output['data'][$zone] = [
            "zi" => $data['zi'],
            "zn" => $data['zn'],
        ];
    }

    $value = $data['vn'];

    if(!isset($output['data'][$zone][$value])) $output['data'][$zone][$value] = [];

    //remove these we don't want them anymore
    unset($data['zi'], $data['zn'], $data['vn']);

    $output['data'][$zone][$value][] = $data;

 }
 $output["online"] = 1;
 $output["success"] = 1;

您可以在这里在线测试

输出量 

 {
    "online": 1,
    "success": 1,
    "data": {
        "zone_1": {
            "zi": "1",
            "zn": "Zone 1",
            "Value 01": [
                {
                    "pioo": "1",
                    "pio": "199",
                    "ve": "0",
                    "station": "1",
                    "es": "1",
                    "eo": "0"
                }
            ],
            "Value 02": [
                {
                    "pioo": "54",
                    "pio": "637",
                    "ve": "0",
                    "station": "3",
                    "es": "0",
                    "eo": "0"
                }
            ]
        },
        "zone_2": {
            "zi": "2",
            "zn": "Zone 2",
            "Value 04": [
                {
                    "pioo": "56",
                    "pio": "642",
                    "ve": "0",
                    "station": "3",
                    "es": "0",
                    "eo": "0"
                }
            ]
        }
    }
}

如您所见，它非常接近您想要的格式，但是添加了$zone = "zone_{$data['zi']}"; 我们可以更好地跟踪事物。 

//php
$output['data'][$zone];

//json
"data": {
    "zone_1"

否则，我们必须先按区域将它们分组，然后在第二个循环中将它们写出。 如您所说， I can not isolate each id of Zones to correctly build my JSON解决方法是将数据输出到按区域ID分组的数组，然后进行循环。 因此，我们将必须构建上面第1阶段中的内容，然后将它们正确分组后，从本质上删除zone密钥。

正如我在评论中提到的那样，在所有这些内容的结尾都存在您想要的格式错误。 就在这里 

"zn":"Zone 1"{   //<--- this bracket
     "Value 01":[
            {
    ...

因此，我不知道这仅仅是一个错字，还是应该以某种方式成为该结构的一部分（我只是忽略了它）。

更新

在我看来，这是一种删除添加的$zone密钥的简便方法。您可以简单地使用array_values剥离密钥。 因此，如下所示，在将其编码为JSON之前添加该行。 

 $output['data'] = array_values($output['data']);

这将结构更改为 

 {
    "online": 1,
    "success": 1,
    "data": [
        {
            "zi": "1",
            "zn": "Zone 1",
            "Value 01": [
                {
                    "pioo": "1",
                    "pio": "199",
                    "ve": "0",
                    "station": "1",
                    "es": "1",
                    "eo": "0"
                }
            ],
            "Value 02": [
                {
                    "pioo": "54",
                    "pio": "637",
                    "ve": "0",
                    "station": "3",
                    "es": "0",
                    "eo": "0"
                }
            ]
        }
    ]   
}

您可以在此处在线看到，但是因为我们已经预先支持了结构，所以我们获得了通过键（$ zon var）进行标识的优势。

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