如何将数据添加到远程数据库？答案

【问题标题】：How to add data to remote DB?如何将数据添加到远程数据库？
【发布时间】：2017-01-09 01:10:21
【问题描述】：

https://github.com/mitchtabian/LoginAndRegister

我刚刚将 BackgroundTask 类中的 urlRegistration 和 urlLogin 变量从“http://tabian.ca/LoginAndRegister-register.php”更改为我的“http://lmonstergirl.0fees.us/LoginAndRegister-register.php”。

数据库与项目相同。

每当我想注册任何人时，我都会收到“成功注册用户”的消息，但它只添加了 id，其他行是空白的。

代码相同，我的 php 文件如下。这个

<?php
require "LoginAndRegister-connection.php";

$user_name = $_POST["identifier_name"];
$user_pass = $_POST["identifier_password"];
$user_email = $_POST["identifier_email"];

//test variables
//$user_name = "Ron";
//$user_pass = "ronspassword";
//$user_email = "ron@tabian.ca";



$query = "INSERT INTO login (name,email,password) VALUES ('$user_name','$user_email','$user_pass')";

if(mysqli_query($conn,$query)){
echo "<h2>Data Successfully Inserted!</h2>";
}
else{
    echo "<h2>Data was unable to be inserted into database :(.</h2>";
}



?>

但是当我把我的 php 改成这个时

<?php
require "LoginAndRegister-connection.php";

//$user_name = $_POST["identifier_name"];
//$user_pass = $_POST["identifier_password"];
//$user_email = $_POST["identifier_email"];

//test variables
$user_name = "Ron";
$user_pass = "ronspassword";
$user_email = "ron@tabian.ca";



$query = "INSERT INTO login (name,email,password) VALUES ('$user_name','$user_email','$user_pass')";

if(mysqli_query($conn,$query)){
    echo "<h2>Data Successfully Inserted!</h2>";
}
else{
    echo "<h2>Data was unable to be inserted into database :(.</h2>";
}



?>

它添加到数据库

我也尝试将 $_POST 更改为 $_GET 并仍然添加空白。

这是我的日志

FATAL EXCEPTION: main
                 Process: applications.loginandregister, PID: 3893
                 android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@12b6e281 is not valid; is your activity running?
                     at android.view.ViewRootImpl.setView(ViewRootImpl.java:576)
                     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:272)
                     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
                     at android.app.Dialog.show(Dialog.java:306)
                     at android.app.AlertDialog$Builder.show(AlertDialog.java:987)
                     at applications.loginandregister.BackgroundTask.display(BackgroundTask.java:183)
                     at applications.loginandregister.BackgroundTask.onPostExecute(BackgroundTask.java:169)
                     at applications.loginandregister.BackgroundTask.onPostExecute(BackgroundTask.java:29)
                     at android.os.AsyncTask.finish(AsyncTask.java:632)
                     at android.os.AsyncTask.access$600(AsyncTask.java:177)
                     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
                     at android.os.Handler.dispatchMessage(Handler.java:102)
                     at android.os.Looper.loop(Looper.java:135)
                     at android.app.ActivityThread.main(ActivityThread.java:5349)
                     at java.lang.reflect.Method.invoke(Native Method)
                     at java.lang.reflect.Method.invoke(Method.java:372)
                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)

我只更改了代码中的网址，但你去吧：

public class BackgroundTask extends AsyncTask<String,Void,String> {

SharedPreferences preferences;
SharedPreferences.Editor editor;

Context context;

BackgroundTask(Context ctx){
    this.context = ctx;
}

@Override
protected String doInBackground(String... params) {

    preferences = context.getSharedPreferences("MYPREFS", Context.MODE_PRIVATE);
    editor = preferences.edit();
    editor.putString("flag","0");
    editor.commit();

    String urlRegistration = "http://lmonstergirl.0fees.us/LoginAndRegister-register.php";
    String urlLogin  = "http://lmonstergirl.0fees.us/LoginAndRegister-login.php";
    String task = params[0];

    if(task.equals("register")){
        String regName = params[1];
        String regEmail = params[2];
        String regPassword = params[3];

        try {
            URL url = new URL(urlRegistration);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            OutputStream outputStream = httpURLConnection.getOutputStream();
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8");
            BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
            String myData = URLEncoder.encode("identifier_name","UTF-8")+"="+URLEncoder.encode(regName,"UTF-8")+"&"
                    +URLEncoder.encode("identifier_email","UTF-8")+"="+URLEncoder.encode(regEmail,"UTF-8")+"&"
                    +URLEncoder.encode("identifier_password","UTF-8")+"="+URLEncoder.encode(regPassword,"UTF-8");
            bufferedWriter.write(myData);
            bufferedWriter.flush();
            bufferedWriter.close();
            InputStream inputStream = httpURLConnection.getInputStream();
            inputStream.close();

            editor.putString("flag","register");
            editor.commit();
            return "Successfully Registered " + regName;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    if(task.equals("login")){
        String loginEmail = params[1];
        String loginPassword = params[2];
        try {
            URL url = new URL(urlLogin);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);

            //send the email and password to the database
            OutputStream outputStream = httpURLConnection.getOutputStream();
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8");
            BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
            String myData = URLEncoder.encode("identifier_loginEmail","UTF-8")+"="+URLEncoder.encode(loginEmail,"UTF-8")+"&"
                    +URLEncoder.encode("identifier_loginPassword","UTF-8")+"="+URLEncoder.encode(loginPassword,"UTF-8");
            bufferedWriter.write(myData);
            bufferedWriter.flush();
            bufferedWriter.close();
            outputStream.close();

            //get response from the database
            InputStream inputStream = httpURLConnection.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"UTF-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String dataResponse = "";
            String inputLine = "";
            while((inputLine = bufferedReader.readLine()) != null){
                dataResponse += inputLine;
            }
            bufferedReader.close();
            inputStream.close();
            httpURLConnection.disconnect();

            System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.out.println(dataResponse);

            editor.putString("flag","login");
            editor.commit();
            return  dataResponse;

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return null;
}

@Override
protected void onPreExecute() {
    super.onPreExecute();
}

//This method willbe called when doInBackground completes... and it will return the completion string which
//will display this toast.
@Override
protected void onPostExecute(String s) {
    String flag = preferences.getString("flag","0");

    if(flag.equals("register")) {
        Toast.makeText(context,s,Toast.LENGTH_LONG).show();
    }
    if(flag.equals("login")){
        String test = "false";
        String name = "";
        String email = "";
        String[] serverResponse = s.split("[,]");
        test = serverResponse[0];
        name = serverResponse[1];
        email = serverResponse[2];

        if(test.equals("true")){
            editor.putString("name",name);
            editor.commit();
            editor.putString("email",email);
            editor.commit();
            Intent intent = new Intent(context,LogginIn.class);
            context.startActivity(intent);
        }else{
            display("Login Failed...", "That email and password do not match our records :(.");
        }
    }else{
        display("Login Failed...","Something weird happened :(.");
    }
}

@Override
protected void onProgressUpdate(Void... values) {
    super.onProgressUpdate(values);
}

public void display(String title, String message){
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}
}

public class LogginIn extends AppCompatActivity {
TextView name,email;
SharedPreferences preferences;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.logged_in_layout);

    email = (TextView) findViewById(R.id.textEmail);
    name = (TextView) findViewById(R.id.textName);
    preferences = this.getSharedPreferences("MYPREFS", Context.MODE_PRIVATE);

    String mName = preferences.getString("name","ERROR getting name");
    String mEmail = preferences.getString("email","ERROR getting email");
    name.setText(mName);
    email.setText(mEmail);
}
}

public class Register extends AppCompatActivity {
EditText etName, etEmail, etPassword;
String name, email, password;
Button btnRegister;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.register_layout);
    etName = (EditText) findViewById(R.id.etNewName);
    etEmail = (EditText) findViewById(R.id.etNewEmail);
    etPassword = (EditText) findViewById(R.id.etNewPassword);
    btnRegister = (Button) findViewById(R.id.btnNewRegister);

    btnRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            name = etName.getText().toString();
            email = etEmail.getText().toString();
            password = etPassword.getText().toString();
            String task = "register";
            BackgroundTask backgroundTask = new BackgroundTask(Register.this);
            backgroundTask.execute(task,name, email, password);
            finish();
        }
    });


}
}

public class MainActivity extends AppCompatActivity {

Button btnRegister, btnLogin;
EditText etEmail,etPassword;
String stringEmail,stringPassword;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnRegister = (Button) findViewById(R.id.btnRegister);
    btnLogin = (Button) findViewById(R.id.btnLogin);
    etEmail = (EditText) findViewById(R.id.etEmail);
    etPassword = (EditText) findViewById(R.id.etPassword);

    btnLogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            stringEmail = etEmail.getText().toString();
            stringPassword = etPassword.getText().toString();
            String task = "login";
            BackgroundTask backgroundTask = new BackgroundTask(MainActivity.this);

            etEmail.setText("");
            etPassword.setText("");

            //execute the task
            //passes the paras to the backgroundTask (param[0],param[1],param[2])
            backgroundTask.execute(task,stringEmail,stringPassword);
        }
    });

    btnRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this,Register.class);
            startActivity(intent);
        }
    });
}
}

【问题讨论】：

代码没什么问题。你确定你的网址在正确的地方吗？
会不会是$_POST上关于服务器的一些错误？
您会收到 Android 异常，因此您应该找到问题所在。为确保 PHP 正常，请创建示例 PHP 表单，您可以在其中输入数据并使用 POST 方法提交。
我已经添加了android代码，你可以看看
我创建了一个 php 表单，我可以通过 vardump 看到 $_post 变量，但无法添加到 db

标签： php android mysql database server

【解决方案1】：

感谢您在 stackoverflow 上发帖！

因为您的测试变量有效，所以您知道它不是 php.ini 文件。问题几乎 100% 出在 android 代码中。请贴出你的安卓代码。

【讨论】：

我已经添加了android代码，你可以看看
我不太确定，它似乎正在工作，但它正在向数据库发布空字符串。您是否收到任何类型的错误消息？清单代码呢？这是正确的吗？您的数据库文本是否设置为 UTF-8？
不幸的是，和教程中的一样。我认为问题的根源是网络主机

【解决方案2】：

我发现我使用的网络服务器有一些问题。我基本上制作了一个表格并添加了 register.php 作为其操作。在我的本地服务器上尝试过，适用于 android 设备和 pc。然后我将该表单添加到 Web 服务器并在 pc 上运行良好，但再次为 android 添加了空白文本。尝试从 android 设备连接时，post 数组为空。

【讨论】：