PHP 将 JSON 数据从 Android 插入 MySQL 数据库

Question

我有一个 Android 应用程序，它通过 HTTP POST 方法将数据发送到 PHP 脚本，并试图解析数据以存储到 MySQL 中。 Android 应用程序不是我编写的，但我可以访问下面包含的源代码；它发送打包为 JSON 数组的数据。我的 PHP 脚本现在尝试将数据同时放入文本文件和 MySQL 数据库中:

<?php

   $con=mysqli_connect("localhost","dbname","dbpassword","table");
   if (mysqli_connect_errno())
   {
     echo "Failed to connect to MySQL DB: " . mysqli_connect_error();
   }

   $filename = __DIR__.DIRECTORY_SEPARATOR."jsontest.txt";

   $postdata = file_get_contents("php://input"); 
   $data = json_decode($postdata, true);


   //if (array_key_exists('records', $data) && is_array($data['records'])) {
   //above if loop threw warning "array_key_exists() expects parameter 2 to be array,  null given"

   if (is_array($data['records'])) {
      foreach ($data['records'] as $record) {
        $name = $record['name'];
        $value = $record['value'];
    $event = $record['event'];
        $timestamp = $record['timestamp'];

        file_put_contents($filename, "$name -> $value with event: $event at $timestamp\n", FILE_APPEND);
        mysqli_query($con,"INSERT INTO `Driving Data`(`Name`, `Value`, `Event`, `Timestamp`) VALUES ($name, $value, $event, $timestamp)");
      }
   }

   mysqli_close($con);
?>

文本文件打印出我告诉它的所有数据。但是，数据库根本不会更新。数据库设置如下:

CREATE TABLE `Driving Data` (
 `Name` varchar(75) NOT NULL,
 `Value` varchar(40) NOT NULL,
 `Event` varchar(20) NOT NULL,
 `Timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=MyISAM DEFAULT CHARSET=latin1

这是 JSON 数据的示例:

{"records":[{"name":"accelerator_pedal_position","value":15.400001,"timestamp":1367598908.278000},{"name":"engine_speed","value":1716.0,"timestamp":1367598908.285000},{"name":"vehicle_speed","value":32.040001,"timestamp":1367598908.290000},{"name":"brake_pedal_status","value":false,"timestamp":1367598908.293000},{"name":"fuel_consumed_since_restart","value":0.147325,"timestamp":1367598908.301000},{"name":"transmission_gear_position","value":"third","timestamp":1367598908.304000},{"name":"steering_wheel_angle","value":-2.3733,"timestamp":1367598908.307000},{"name":"fuel_consumed_since_restart","value":0.14745,"timestamp":1367598908.314000},{"name":"transmission_gear_position","value":"third","timestamp":1367598908.317000},{"name":"door_status","value":"driver","event":false,"timestamp":1367598908.320000},{"name":"door_status","value":"passenger","event":false,"timestamp":1367598908.326000},{"name":"door_status","value":"rear_left","event":false,"timestamp":1367598908.329000},{"name":"door_status","value":"rear_right","event":false,"timestamp":1367598908.331000},{"name":"odometer","value":0.0,"timestamp":1367598908.338000},{"name":"high_beam_status","value":false,"timestamp":1367598908.341000},{"name":"steering_wheel_angle","value":-2.3733,"timestamp":1367598908.343000},{"name":"engine_speed","value":1716.0,"timestamp":1367598908.351000},{"name":"powertrain_torque","value":74.0,"timestamp":1367598908.358000},{"name":"accelerator_pedal_position","value":12.1,"timestamp":1367598908.364000},{"name":"latitude","value":42.293911,"timestamp":1367598908.367000},{"name":"longitude","value":-83.238762,"timestamp":1367598908.376000},{"name":"engine_speed","value":1718.0,"timestamp":1367598908.380000},{"name":"vehicle_speed","value":32.200001,"timestamp":1367598908.382000},{"name":"brake_pedal_status","value":false,"timestamp":1367598908.391000},{"name":"transmission_gear_position","value":"third","timestamp":1367598908.393000}]} 

所以我对 PHP 比较陌生，我似乎无法弄清楚问题是什么(即为什么数据库没有用这些值更新但它仍然可以将它们写到文本文件中。供引用，下面是用于将数据发送到 Web 服务器的 Android 代码(我无法更改它):

public class UploaderSink extends ContextualVehicleDataSink {
private final static String TAG = "UploaderSink";
private final static int UPLOAD_BATCH_SIZE = 25;
private final static int MAXIMUM_QUEUED_RECORDS = 5000;
private final static int HTTP_TIMEOUT = 5000;

private URI mUri;
private BlockingQueue<String> mRecordQueue =
        new LinkedBlockingQueue<String>(MAXIMUM_QUEUED_RECORDS);
private Lock mQueueLock = new ReentrantLock();
private Condition mRecordsQueued = mQueueLock.newCondition();
private UploaderThread mUploader = new UploaderThread();

/**
 * Initialize and start a new UploaderSink immediately.
 *
 * @param uri the URI to send HTTP POST requests to with the JSON data.
 */
public UploaderSink(Context context, URI uri) {
    super(context);
    mUri = uri;
}

public UploaderSink(Context context, String path) throws DataSinkException {
    this(context, uriFromString(path));
}

@Override
public void stop() {
    super.stop();
    mUploader.done();
}

public boolean receive(RawMeasurement measurement) {
    String data = measurement.serialize(true);
    mRecordQueue.offer(data);
    if(mRecordQueue.size() >= UPLOAD_BATCH_SIZE) {
        mQueueLock.lock();
        mRecordsQueued.signal();
        mQueueLock.unlock();
    }
    return true;
}

/**
 * Returns true if the path is not null and if it is a valid URI.
 *
 * @param path a URI to validate
 * @return true if path is a valid URI.
 *
 */
public static boolean validatePath(String path) {
    if(path == null) {
        Log.w(TAG, "Uploading path not set (it's " + path + ")");
        return false;
    }

    try {
        uriFromString(path);
        return true;
    } catch(DataSinkException e) {
        return false;
    }
}

@Override
public String toString() {
    return Objects.toStringHelper(this)
        .add("uri", mUri)
        .add("queuedRecords", mRecordQueue.size())
        .toString();
}

private static URI uriFromString(String path) throws DataSinkException {
    try {
        return new URI(path);
    } catch(java.net.URISyntaxException e) {
        throw new UploaderException(
            "Uploading path in wrong format -- expected: ip:port");
    }
}

private static class UploaderException extends DataSinkException {
    private static final long serialVersionUID = 7436279598279767619L;

    public UploaderException() { }

    public UploaderException(String message) {
        super(message);
    }
}

private class UploaderThread extends Thread {
    private boolean mRunning = true;

    public UploaderThread() {
        start();
    }

    public void run() {
        while(mRunning) {
            try {
                ArrayList<String> records = getRecords();
                String data = constructRequestData(records);
                HttpPost request = constructRequest(data);
                makeRequest(request);
            } catch(UploaderException e) {
                Log.w(TAG, "Problem uploading the record", e);
            } catch(InterruptedException e) {
                Log.w(TAG, "Uploader was interrupted", e);
                break;
            }
        }
    }

    public void done() {
        mRunning = false;
    }

    private String constructRequestData(ArrayList<String> records)
            throws UploaderException {
        StringWriter buffer = new StringWriter(512);
        JsonFactory jsonFactory = new JsonFactory();
        try {
            JsonGenerator gen = jsonFactory.createJsonGenerator(buffer);

            gen.writeStartObject();
            gen.writeArrayFieldStart("records");
            Iterator<String> recordIterator = records.iterator();
            while(recordIterator.hasNext()) {
                gen.writeRaw(recordIterator.next());
                if(recordIterator.hasNext()) {
                    gen.writeRaw(",");
                }
            }
            gen.writeEndArray();
            gen.writeEndObject();

            gen.close();
        } catch(IOException e) {
            Log.w(TAG, "Unable to encode all data to JSON -- " +
                    "message may be incomplete", e);
            throw new UploaderException();
        }
        return buffer.toString();
    }

    private HttpPost constructRequest(String data)
            throws UploaderException {
        HttpPost request = new HttpPost(mUri);
        try {
            ByteArrayEntity entity = new ByteArrayEntity(
                    data.getBytes("UTF8"));
            entity.setContentEncoding(
                    new BasicHeader("Content-Type", "application/json"));
            request.setEntity(entity);
        } catch(UnsupportedEncodingException e) {
            Log.w(TAG, "Couldn't encode records for uploading", e);
            throw new UploaderException();
        }
        return request;
    }

    private void makeRequest(HttpPost request) throws InterruptedException {
        HttpParams parameters = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(parameters, HTTP_TIMEOUT);
        HttpConnectionParams.setSoTimeout(parameters, HTTP_TIMEOUT);
        final HttpClient client = new DefaultHttpClient(parameters);
        try {
            HttpResponse response = client.execute(request);
            final int statusCode = response.getStatusLine().getStatusCode();
            if(statusCode != HttpStatus.SC_CREATED) {
                Log.w(TAG, "Got unxpected status code: " + statusCode);
            }
        } catch(IOException e) {
            Log.w(TAG, "Problem uploading the record", e);
            try {
                Thread.sleep(5000);
            } catch(InterruptedException e2) {
                Log.w(TAG, "Uploader interrupted after an error", e2);
                throw e2;
            }
        }
    }

    private ArrayList<String> getRecords() throws InterruptedException {
        mQueueLock.lock();
        if(mRecordQueue.isEmpty()) {
            // the queue is already thread safe, but we use this lock to get
            // a condition variable we can use to signal when a batch has
            // been queued.
            mRecordsQueued.await();
        }

        ArrayList<String> records = new ArrayList<String>();
        mRecordQueue.drainTo(records, UPLOAD_BATCH_SIZE);

        mQueueLock.unlock();
        return records;
    }
}

Answer 1

尝试将 unix 时间戳转换为 mysql 时间戳

if (is_array($data['records'])) {
  foreach ($data['records'] as $record) {
    $name = $record['name'];
    $value = $record['value'];
$event = $record['event'];
    $timestamp = date('Y-m-d H:i:s',$record['timestamp']);

    file_put_contents($filename, "$name -> $value with event: $event at $timestamp\n", FILE_APPEND);
    mysqli_query($con,"INSERT INTO `Driving Data`(`Name`, `Value`, `Event`, `Timestamp`) VALUES ($n

ame, $value, $event, $timestamp)");
      }
   }