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- var express = require('express');
- var app = express();
- var bodyParser = require('body-parser');
- var mysql = require('mysql');
- //connection
- var con = mysql.createConnection({
- host: "localhost",
- user: "root",
- password: "password",
- database : "androidtest"
- });
- //use json
- app.use(bodyParser.json());
- app.use(bodyParser.urlencoded({ extended: false }));
- //declare variables to hold values entered by the user
- var name;
- var username;
- var password;
- var age;
- //boolean array to let frontend know what is going on
- var response;
- app.post('/', function(req, res) {
- //retrieve variables
- username = req.body.username;
- name = req.body.name;
- age = req.body.age;
- password = req.body.password;
- //query database
- //check if username is taken
- var select = "SELECT * FROM users WHERE username = ? LIMIT 1";
- con.query(select, [username], function (err, results) {
- if (err) throw err;
- //if username is taken send json string 'exists' to android app
- if(results.length) {
- response = {"exists" : "true"};
- //if username is available send string 'success' and add the user to the database
- } else {
- var add = "INSERT INTO users (name, username, age, password) VALUES (?, ?, ?, ?)";
- response = {"success" : "true"};
- con.query(add, [name, username, age, password]);
- if (err) throw err;
- console.log('row inserted');
- }
- });
- //send json
- res.json(response);
- //prevents the functions from being executed more than once
- res.end('/');
- });
- //listen on port 3000
- app.listen(3000);
- bRegister.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- final String name = etName.getText().toString();
- final String username = etUserName.getText().toString();
- final String password = etPassword.getText().toString();
- final int age = Integer.parseInt(etAge.getText().toString());
- Response.Listener<String> responseListener = new Response.Listener<String>() {
- @Override
- public void onResponse(String response) {
- try {
- JSONObject jsonResponse = new JSONObject(response);
- //Boolean exists = jsonResponse.getBoolean("exists");
- String exists = jsonResponse.getString("exists");
- if (exists.matches("true")) {
- Toast toast = Toast.makeText(getApplicationContext(), "username already exists", Toast.LENGTH_SHORT);
- toast.show();
- }
- } catch(Exception e) {
- e.printStackTrace();
- }
- try {
- JSONObject jsonResponse = new JSONObject(response);
- //Boolean success = jsonResponse.getBoolean("success");
- String success = jsonResponse.getString("success");
- if (success.matches("true")) {
- Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
- RegisterActivity.this.startActivity(intent);
- } else {
- AlertDialog.Builder builder = new AlertDialog.Builder(RegisterActivity.this);
- builder.setMessage("Register Failed")
- .setNegativeButton("Retry", null)
- .create()
- .show();
- }
- } catch (JSONException e) {
- e.printStackTrace();
- }
- }
- };
- RegisterRequest registerRequest = new RegisterRequest(name, username, age, password, responseListener);
- RequestQueue queue = Volley.newRequestQueue(RegisterActivity.this);
- queue.add(registerRequest);
- }
- });
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