检查用户是否存在

Question

检查用户是否存在

use*_*790 6 php mysql jquery pdo cordova

可能重复:
Phonegap - 根据用户ID从数据库加载值

我正在创建一个需要用户注册的Phonegap应用程序.我这样做是通过PHP脚本充当MySQL数据库的Web服务并使用AJAX POST/Get方法.

出于某种原因,LogCat总是给我"There was an error"(落在帖子的错误函数中).

更新: 从MySQL的日志我得到这个错误:
PHP致命错误:调用bindValue()非对象上的成员函数
它指向这一行:$username = $_POST['username'];

这是我的JS代码的片段:

var u = $("#username").val();    
var p = $("#password").val();

var userRegData = $('#registration').serialize();

$.ajax({
  type: 'POST',
  data: userRegData,
  dataType: 'JSONp',
  url: 'http://www.somedomain.com/php/userregistration.php',
  success: function(data){   
      if(response==1){
          // User can be saved
      } else {
          // User exsts already 
      }
  },
  error: function(e){
      console.log('There was an error');
      $.mobile.loading ('hide'); 
  }
}); 
return false;

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这是我的PHP代码片段.我正在使用PDO.

$db = new PDO('mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'], $config['db']['username'], $config['db']['password']);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$username = $_POST['username'];
$password = $_POST['password'];
$query->bindValue(':username', $username, PDO::PARAM_STR);
$query->bindValue(':password', $password, PDO::PARAM_STR);

try {

$db->beginTransaction();

$db->query("SELECT `user`.`Username` FROM `user` WHERE `user`.`Username` = :username LIMIT 1");
try {
    if ( $query->rowCount() > 0 ) {
        $response=1;
        echo $response;
    }
    else {
        $response=0;
        $db->query("INSERT INTO `user` (`user`.`Username`, `user`.`Password`) VALUES :username, :password");
        echo $response; 
        $db->commit();  
    }
} catch (PDOException $e) {
    die ($e->getMessage());
}


} catch (PDOException $e) {
    $db->rollBack();
    die ($e->getMessage());
}

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Answer 1

Aka*_*ash 1

应该是这样的

您的HTML 页面

<html>
    <body>
        <script>
            function checkIfUserCanBeSaved(){
                var userRegData = $('#registration').serialize();

                $.ajax({
                  type: 'POST',
                  data: userRegData,
                  url: 'http://www.somedomain.com/php/userregistration.php',
                  success: function(data){   
                      if(response==1){
                          alert('user found');
                      } else {
                          alert('user saved')
                      }
                  },
                  error: function(e){
                      console.log('There was an error');
                      $.mobile.loading ('hide');
                  }
                });
                return false;
            }
        </script>
        <form id="registration">
            <input type="text" name="username">
            <input type="text" name="password">
            <input type="button" onclick="checkIfUserCanBeSaved()" value="submit">
        </form>
    </body>
</html>

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您的PHP 页面

$db = new PDO('mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'], $config['db']['username'], $config['db']['password']);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$username = $_POST['username'];
$password = $_POST['password'];


try {

$db->beginTransaction();

try {

     $query = $db->prepare("SELECT user.Username FROM user WHERE user.Username = :username LIMIT 1");
     $query->bindValue(':username', $username, PDO::PARAM_STR);
     $query->execute();

    if ( $query->rowCount() > 0 ) {
        $response=1;
        echo $response;
    }
    else {
        $response=0;
        $query = $db->prepare("INSERT INTO user ( username, password ) VALUES ( :username, :password )" );
        $query->bindValue(':username', $username, PDO::PARAM_STR);
        $query->bindValue(':password', $password, PDO::PARAM_STR);
        $query->execute();
        echo $response; 
        $db->commit();  
    }
} catch (PDOException $e) {
    die ($e->getMessage());
}


} catch (PDOException $e) {
    $db->rollBack();
    die ($e->getMessage());
}

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