[英]PHP login/registration system error
我通过参考此视频教程来进行登录/注册系统:PHP OOP登录/注册系统:数据库查询(第8/23部分) :
我得到一个错误:
<?php
require_once 'core/init.php';
$user = DB::getInstance()->get('user', array('username', '=', 'mantas'));
if(!$user->count()) {
echo 'No user';
} else {
echo 'Ok';
}
这是我认为问题出在我的DB.php :
<?php
class DB {
private static $_instance = null;
private $_pdo,
$_query,
$_error = false,
$_results,
$_count = 0;
private function __construct() {
try {
$this->_pdo = new PDO('mysql:host=' . Config::get('mysql/host') . ';dbname=' . Config::get('mysql/db'), Config::get('mysql/username'), Config::get('mysql/password'));
} catch(PDOException $e) {
die($e->getMessage());
}
}
public static function getInstance () {
if(!isset(self::$_instance)) {
self::$_instance = new DB();
}
return self::$_instance;
}
public function query($sql, $params = array()) {
$this->_error = false;
if($this->_query = $this->_pdo->prepare($sql)) {
$x = 1;
if(count($params)) {
foreach($params as $param) {
$this->_query->bindValue($x,$param);
$x++;
}
}
if($this->_query->execute()) {
$this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ);
$this->_count = $this->_query->rowCount();
} else {
$this->_error = true;
}
}
return $this;
}
public function action($action, $table, $where = array()) {
var_dump(count($where));
if(count($where) === 3) {
$operators = array('=', '>', '<', '>=', '<=');
$field = $where[0];
$operator = $where[1];
$value = $where[2];
if(in_array($operator, $operators)) {
$sql = "{$action} FROM {$table} WHERE {$field} {$operator} {$value} ?";
if(!$this->query($sql, array($value))->error()) {
return $this;
}
}
}
return false;
}
public function get($table, $where) {
return $this->action('SELECT *', $table, $where);
}
public function delete($table, $where) {
return $this->action('DELETE', $table, $where);
}
public function count() {
return $this->_count;
}
public function error() {
return $this->_error;
}
}
我找不到问题所在,也许可以。
您必须确保方法执行始终返回对象。 在某些情况下,您的action
方法可能返回false。 作为解决方法,您可以将代码更改为:
require_once 'core/init.php';
$db = DB::getInstance();
$user = $db->get('user', array('username', '=', 'mantas'));
if(!$db->count()) {
echo 'No user';
} else {
echo 'Ok';
}
$ db =新的DB(); $ user = $ db-> get('user',array('username','=','mantas'));
if(!$user->count()) {
echo 'failed';
} else {
echo 'success';
}
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