Android应用：如何避免重复的电子邮件和电话号码，当人们登记

Question

我有一个移动应用程序，允许技术人员进行登记，我要防止重复电子邮件地址和手机号码，我在我的PHP文件写了这个代码

<?php 
require "config.php"; 

$name = $_POST['name']; 

$password = $_POST['userpass']; 
$emailadd = $_POST['emailadd']; 
$phone = $_POST['phone']; 
$category = $_POST['category']; 
$token = $_POST['token']; 

$username = stripslashes($username); 
$password = stripslashes($password); 

$sql_get_email= "SELECT * FROM technician where emailadd ='$emailadd';"; 

$result1 = mysqli_query($db, $sql_get_email); 

$row = mysqli_fetch_array($result1,MYSQLI_ASSOC); 


     $count = mysqli_num_rows($result); 

     // If result matched $myusername and $mypassword, table row must be 1 row 

     if($count >0) { 
     echo "Email already exists in our database"; 

die(); 
} 
else { 
    $mysql_get_phone = "SELECT * FROM technician where mobile ='$phone';"; 

$result1 = mysqli_query($db, $sql_get_email); 

$row = mysqli_fetch_array($result1,MYSQLI_ASSOC); 


     $count = mysqli_num_rows($result); 

     // If result matched $myusername and $mypassword, table row must be 1 row 

     if($count >0) { 
     echo "Pnone number already exists in our database"; 

die(); 

} 

else { 

$sql = "INSERT INTO technician (name, emailadd, password, mobile, category, fcm_key) 
VALUES ('$name', '$emailadd', '$password','$phone', '$category','$token')"; 

if ($db->query($sql) === TRUE) { 
    echo "New record created successfully"; 
} else { 
    echo "Error: " . $sql . "<br>" . $db->error; 
} 
}} 
$db->close(); 
?> 

，我有这个摘自我BackgroundTask.java检查登记

@Override 
protected void onPostExecute(String result) { 
    if (result.equals("Email already exists in our database")) { 

    final Dialog dialog = new Dialog(ctx); 
    dialog.setContentView(R.layout.dialog_second); 
    dialog.setTitle("ERROR"); 
    dialog.setCancelable(true); 
    //set up text 
    TextView text = (TextView) dialog.findViewById(R.id.TextView01); 
    text.setText(result); 

    //set up button 
    Button button = (Button) dialog.findViewById(R.id.btnOk); 

    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      dialog.dismiss(); 
     } 

    }); 
    //now that the dialog is set up, it's time to show it 
    dialog.show(); 
} else if (result.equals("Pnone number already exists in our database")) { 

    final Dialog dialog = new Dialog(ctx); 
    dialog.setContentView(R.layout.dialog_second); 
    dialog.setTitle("ERROR"); 
    dialog.setCancelable(true); 
    //set up text 
    TextView text = (TextView) dialog.findViewById(R.id.TextView01); 
    text.setText(result); 

    //set up button 
    Button button = (Button) dialog.findViewById(R.id.btnOk); 

    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      dialog.dismiss(); 
     } 

    }); 
    //now that the dialog is set up, it's time to show it 
    dialog.show(); 
}else 
if (result.equals("Registration Success...")) { 
    Toast.makeText(ctx, "Registration Successful......Please login", Toast.LENGTH_LONG).show(); 


    Intent intent = new Intent(ctx, Login.class); 
    ctx.startActivity(intent); 

我发现登记始终是即使有重复录入成功的结果。

的config.php

<?php 
    define('DB_SERVER', 'localhost'); 
    define('DB_USERNAME', 'proartisan_dbadmin'); 
    define('DB_PASSWORD', 'YYYYYYYYY'); 
    define('DB_DATABASE', 'XXXXXXXXX'); 
    $db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE); 
?> 

Answer 1

所以这里我详细的解答。

新的config.php因此，使用的mysqli和准备好的发言

<?php 
    define('DB_SERVER', 'localhost'); 
    define('DB_USERNAME', 'proartisan_dbadmin'); 
    define('DB_PASSWORD', 'YYYYYYYYY'); 
    define('DB_DATABASE', 'XXXXXXXXX'); 
    $db = new mysqli(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_DATABASE); 
?> 

新主要PHP

<?php 
require "config.php"; 

$name = $_POST['name']; 

$password = $_POST['userpass']; 
$emailadd = $_POST['emailadd']; 
$phone = $_POST['phone']; 
$category = $_POST['category']; 
$token = $_POST['token']; 

$username = stripslashes($username); 
$password = stripslashes($password); 

if ($db->connect_error) { 

die("Connection failed: " . $db->connect_error); 

} 

$sql_get_email= "SELECT * FROM technician where emailadd =$emailadd"; 

$stmt=$conn->prepare($sql_get_email); 
$stmt->execute(); 
$stmt->store_result(); 
$stmt->fetch(); 
$count=$stmt->num_rows(); 

     // If result matched $myusername and $mypassword, table row must be 1 row 

     if($count >0) { 
     echo "Email already exists in our database"; 
     $stmt->close(); 
     die(); 
} 
else { 
    $mysql_get_phone = "SELECT * FROM technician where mobile =$phone"; 

    $stmt=$conn->prepare($mysql_get_phone); 
    $stmt->execute(); 
    $stmt->store_result(); 
    $stmt->fetch(); 
    $count=$stmt->num_rows(); 


    // If result matched $myusername and $mypassword, table row must be 1 row 

     if($count >0) { 
     echo "Pnone number already exists in our database"; 
     $stmt->close(); 
     die(); 
     } 
} 
else { 

$sql = "INSERT INTO technician (name, emailadd, password, mobile, category, fcm_key) 
VALUES (?, ?, ?, ?, ?, ?)"; 

$stmt=$conn->prepare($sql); 
$stmt->bind_param('ssssss', $name, $emailadd, $password, $phone, $category, $token); 

if($stmt->execute()){ 
    echo "New record created successfully"; 
}else{ 
    echo "Error: " . $sql . "<br>" . $stmt->error; 
} 

$stmt->close(); 
$db->close(); 
}} 
?> 

避免SQL注入如果电子邮件或电话 alerady存在回声和关闭连接以避免问题。