使用php在mysql數據庫中插入一條記錄

Question

我正在android上進行調查的項目，這是關於登錄（此部分有效）並插入數據這一部分不起作用的是問卷，當調查人員登錄到應用程序時，需要進行調查，這個項目我從5個問題開始，以是或否的答案作為原型，他必須回答這些問題，並且在單擊“保存”按鈕時必須將其添加到mysql數據庫中。 但這是行不通的（下面是logcat），這里是類問卷調查表.java：

public class Questionnaire extends Activity implements LocationListener {
// Progress Dialog
    private ProgressDialog pDialog;
//latitude et longitude
    private LocationManager lm;
    Location location;
    double longitude = 0;
    double latitude = 0;
    private double altitude;
    private float accuracy;
    int i;
    JSONParser jsonParser = new JSONParser();
    Button enregistrer;
    EditText zone;
    RadioGroup mRadioGroup1, mRadioGroup2, mRadioGroup3, mRadioGroup4, mRadioGroup5;
    RadioButton b1, b2, b3, b4, b5;
// url to create new product
    private static String url_insertion = "http://10.0.2.2/android/insertion.php";
// JSON Node names
    private static final String TAG_SUCCESS = "success";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.questions);
        Bundle params = getIntent().getExtras();
        i = params.getInt("compteur");
        i++;

        // Edit zone text
        EditText zone1 = (EditText) findViewById(R.appreciation.zone);

        // edit latitude longitude
        latitude = location.getLatitude();
        longitude = location.getLongitude();

        // edit radiogroup
        mRadioGroup1 = (RadioGroup) findViewById(R.appreciation.rep1);
        mRadioGroup2 = (RadioGroup) findViewById(R.appreciation.rep2);
        mRadioGroup3 = (RadioGroup) findViewById(R.appreciation.rep3);
        mRadioGroup4 = (RadioGroup) findViewById(R.appreciation.rep4);
        mRadioGroup5 = (RadioGroup) findViewById(R.appreciation.rep5);

        //edit radio button
        b1 = (RadioButton) findViewById(mRadioGroup1.getCheckedRadioButtonId());
        b2 = (RadioButton) findViewById(mRadioGroup2.getCheckedRadioButtonId());
        b3 = (RadioButton) findViewById(mRadioGroup3.getCheckedRadioButtonId());
        b4 = (RadioButton) findViewById(mRadioGroup4.getCheckedRadioButtonId());
        b5 = (RadioButton) findViewById(mRadioGroup5.getCheckedRadioButtonId());

        // Create button
        Button enregistrer = (Button) findViewById(R.appreciation.enregistrer);

        // button click event
        enregistrer.setOnClickListener(new OnClickListener() {

            public void onClick(View view) {
                new InsertAppreciation().execute();
            }
        });
    }

    class InsertAppreciation extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Questionnaire.this);
            pDialog.setMessage("Creating Product..");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        /**
         * Creating appreciation
         * */
        protected String doInBackground(String... args) {
            String zone1 = zone.getText().toString();
            //  String latitude = String.valueOf(latitude).toString();
            //  String longitude = String.valueOf(longitude).toString();
            String rep1 = b1.getText().toString();
            String rep2 = b2.getText().toString();
            String rep3 = b3.getText().toString();
            String rep4 = b4.getText().toString();
            String rep5 = b5.getText().toString();

            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("zone", zone1));
            //  params.add(new BasicNameValuePair("latitude", latitude));
            //   params.add(new BasicNameValuePair("longitude", longitude));
            params.add(new BasicNameValuePair("rep1", rep1));
            params.add(new BasicNameValuePair("rep2", rep2));
            params.add(new BasicNameValuePair("rep3", rep3));
            params.add(new BasicNameValuePair("rep4", rep4));
            params.add(new BasicNameValuePair("rep5", rep5));

            // getting JSON Object
            // Note that create product url accepts POST method
            JSONObject json = jsonParser.makeHttpRequest(url_insertion,
                    "POST", params);

            // check log cat fro response
            Log.d("Create Response", json.toString());

            // check for success tag
            try {
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    // successfully created appreciation
                    Toast.makeText(getBaseContext(), "Successful insertion", Toast.LENGTH_SHORT).show();
                    if (i < 5) {
                        Intent intent1 = new Intent(Questionnaire.this, Questionnaire.class);
                        intent1.putExtra("compteur", i);
                        startActivity(intent1);
                    } else {
                        Intent intent2 = new Intent(Questionnaire.this, Endsurvey.class);
                        startActivity(intent2);
                    }

                } else {
                    // failed to create appreciation
                    Toast.makeText(getBaseContext(), "failed insertion", Toast.LENGTH_SHORT).show();
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once done
            pDialog.dismiss();

        }
    }
}

抱歉，我知道時間太長，但我別無選擇。 這是日志：

08-15 22:15:31.620: D/AndroidRuntime(241): Shutting down VM
08-15 22:15:31.630: W/dalvikvm(241): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
08-15 22:15:31.640: E/AndroidRuntime(241): Uncaught handler: thread main exiting due to uncaught exception
08-15 22:15:31.671: E/AndroidRuntime(241): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.stage.sondage/com.stage.sondage.Questionnaire}: java.lang.NullPointerException
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.ActivityThread.access$2200(ActivityThread.java:119)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.os.Looper.loop(Looper.java:123)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.ActivityThread.main(ActivityThread.java:4363)
08-15 22:15:31.671: E/AndroidRuntime(241):  at java.lang.reflect.Method.invokeNative(Native Method)
08-15 22:15:31.671: E/AndroidRuntime(241):  at java.lang.reflect.Method.invoke(Method.java:521)
08-15 22:15:31.671: E/AndroidRuntime(241):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-15 22:15:31.671: E/AndroidRuntime(241):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-15 22:15:31.671: E/AndroidRuntime(241):  at dalvik.system.NativeStart.main(Native Method)
08-15 22:15:31.671: E/AndroidRuntime(241): Caused by: java.lang.NullPointerException
08-15 22:15:31.671: E/AndroidRuntime(241):  at com.stage.sondage.Questionnaire.onCreate(Questionnaire.java:73)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-15 22:15:31.671: E/AndroidRuntime(241):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
08-15 22:15:31.671: E/AndroidRuntime(241):  ... 11 more
08-15 22:15:31.730: I/dalvikvm(241): threadid=7: reacting to signal 3
08-15 22:15:31.730: E/dalvikvm(241): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
08-15 22:15:35.341: I/Process(241): Sending signal. PID: 241 SIG: 9
08-15 22:15:36.380: E/ActivityThread(282): Failed to find provider info for com.google.settings
08-15 22:15:36.390: E/ActivityThread(282): Failed to find provider info for com.google.settings
08-15 22:15:36.430: E/ActivityThread(282): Failed to find provider info for com.google.settings
08-15 22:15:36.982: D/dalvikvm(282): GC freed 1983 objects / 133688 bytes in 137ms
08-15 22:15:37.110: D/LocationManager(282): Constructor: service = android.location.ILocationManager$Stub$Proxy@44ea4f80
08-15 22:15:37.212: D/LocationManager(282): removeUpdates: listener = com.google.android.maps.MyLocationOverlay@44e9db00
08-15 22:15:37.222: I/Maps.MyLocationOverlay(282): Request updates from gps
08-15 22:15:37.360: D/SensorManager(282): found sensor: Goldfish 3-axis Accelerometer, handle=0
08-15 22:15:37.520: D/SensorManager(282): found sensor: Goldfish 3-axis Magnetic field sensor, handle=1
08-15 22:15:37.672: D/SensorManager(282): found sensor: Goldfish Orientation sensor, handle=2
08-15 22:15:37.830: D/SensorManager(282): found sensor: Goldfish Temperature sensor, handle=3
08-15 22:15:37.970: I/MapActivity(282): Handling network change notification:CONNECTED
08-15 22:15:37.980: E/MapActivity(282): Couldn't get connection factory client
08-15 22:15:38.460: D/dalvikvm(282): GC freed 5048 objects / 299360 bytes in 90ms
08-15 22:16:00.971: D/dalvikvm(282): GC freed 13338 objects / 892160 bytes in 200ms

這是php文件：

    <?php
    //turn off error reporting
     error_reporting(E_ALL ^ E_NOTICE ^ E_WARNING);

    //Create fields for the database
    //server, username, password, database

    $dbhost = "localhost";
    $dbuser = "root";
    $dbpass = "";
    $dbdb = "survey";

    //connect to mySQL
    $connect = mysql_connect($dbhost, $dbuser, $dbpass) or die("connection error");

    //Select the database
    mysql_select_db($dbdb)or die("database selection error");

    //Retrieve the login details via POST
    $zone = $_POST['zone'];
    $latitude = $_POST['latitude'];
    $longitude = $_POST['longitude'];
    $rep1 = $_POST['rep1'];
    $rep2 = $_POST['rep2'];
    $rep3 = $_POST['rep3'];
    $rep4 = $_POST['rep4'];
    $rep5 = $_POST['rep5'];

    // mysql inserting a new row
    $result = mysql_query("INSERT INTO appreciation(id, zone, latitude, longitude,                    rep1, rep2, rep3, rep4, rep5) VALUES('', '$zone1', '', '', '$rep1', '$rep2', '$rep3',  '$rep4', '$rep5' )");



    // check if row inserted or not
    if ($result) {
    // successfully inserted into database
    $response["success"] = 1;
    $response["message"] = "Product successfully created.";

    // echoing JSON response
    echo json_encode($response);
    } else {
    // failed to insert row
    $response["success"] = 0;
    $response["message"] = "Oops! An error occurred.";

    // echoing JSON response
    echo json_encode($response);
     }
    } else {
     // required field is missing
      $response["success"] = 0;
      $response["message"] = "Required field(s) is missing";

        // echoing JSON response
        echo json_encode($response);
    //close the connection
    mysql_close();


         }



          ?>

請幫助，這真的很緊急。 謝謝

Answer 1

首先，正如其他人在評論中說的那樣，請查看PDO，因為您的數據庫交互非常不安全。

您提供的異常跟蹤表明，“ Questionnaire活動的onCreate方法中發生了未捕獲（使用try / catch開始）異常。 我期望（請通過調試檢查）當您第二次查看compteur捆綁包中的compteur時會拋出該錯誤（您將從Questionnaire到Questionnaire活動）。

我可以看到您在激發意圖時將對象放入捆綁包中，但是在進行操作之前尚未檢查它是否為null。

Answer 2

Unable to open stack trace file '/data/anr/traces.txt': Permission denied

您是否在清單xml文件中添加了從SD卡讀取的權限？

<uses-permission  android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>