我尝试学习如何制作MVC模型，但我有以下错误： 注意：抱歉，没有在....... / pdodatabasehandler.php中找到方法准备27 致命错误：在.... / abstractmodel.php 98
中调用null上的成员函数execute（）databasehandler.php
<?php
namespace BATRAHOSTMVC\Lib\Database;
/**
* Description of DatabaseHandler
*
* @author Mohamed Hassan Elmetwaly
* 25-03-2017
* mhe.developer@gmail.com
*/
abstract class DatabaseHandler {
const DATABASE_DRIVER_POD = 1;
const DATABASE_DRIVER_MYSQLI = 2;
private function __construct() {
}
abstract protected static function init();
abstract protected static function getInstance();
public static function factory()
{
// $driver = DATABASE_CONN_DRIVER;
// if($driver == self::DATABASE_DRIVER_POD)
// {
return PDODatabaseHandler::getInstance();
// } else if ($driver == self::DATABASE_DRIVER_MYSQLI)
// {
// return MySQLiDatabaseHandler::getInstance();
// }
}
}
pdodatabasehandler.php
<?php
namespace BATRAHOSTMVC\Lib\Database;
/**
* Description of pdodatabasehandler
* @author Mohamed Hassan Elmetwaly
* 25-03-2017
* mhe.developer@gmail.com
*/
class PDODatabaseHandler extends DatabaseHandler
{
private static $_instance;
private static $_handler;
private function __construct() {
self::init();
}
//public function __call($name, $arguments) {}
public function __call($name, $arguments) {
if(method_exists($this, $name))
{
$this->$name($arguments);
} else {
trigger_error('Sorry no method '. $name. ' has been found');
}
}
protected static function init(){
try{
self::$_handler = new \PDO(
'mysql:host='.DATABASE_HOST_NAME.';dbname='.DATABASE_DB_NAME,DATABASE_USER_NAME,
DATABASE_PASSW0RD);
//var_dump(self::$_handler);
//self::$_handler = new pdo("mysql:host=localhost; dbname=test", 'root', 'rootbootroot');
//return 'Connected';
} catch (\PDOException $e)
{
echo $e->getMessage( ) ." | ". $e->getCode( ) ;
}
}
public static function getInstance() {
if(self::$_instance === null){
self::$_instance = new self();
}
return self::$_instance;
}
}
abstractmodel.php
<?php
namespace BATRAHOSTMVC\Models;
use BATRAHOSTMVC\Lib\Database\DatabaseHandler;
//echo DATABASE_DB_NAME;
/**
* Description of abstractmodel
* @author Mohamed Hassn Elmetwaly (25-03-2017)
* mhe.developer@gmail.com
*/
class AbstractModel
{
const DATA_TYPE_BOOL = \PDO::PARAM_BOOL;
const DATA_TYPE_STR = \PDO::PARAM_STR;
const DATA_TYPE_INT = \PDO::PARAM_INT;
const DATA_TYPE_DECIMAL = 4;
const DATA_TYPE_DATE = 5;
/*
public static function viewTableSchema()
{
return static::$tableSchema;
}
*
*/
// we make path by reference
private function prepareValues(\PDOStatement &$stmt)
{
foreach (static::$tableSchema as $columnName => $type)
{
if($type == 4)
{
$sanitizedValue = filter_var($this->$columnName, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
$stmt->bindValue(":{$columnName}", $sanitizedValue);
}
else
{
$stmt->bindValue(":{$columnName}", $this->$columnName, $type);
}
}
}
private static function buildNameParametersSQL()
{
$nameParams = '';
//$columnName (Column Name) => $type (Column datatype)
foreach (static::$tableSchema as $columnName => $type)
{
$nameParams .= $columnName. ' = :'.$columnName. ', ';
}
return trim($nameParams, ', ');
}
private static function create()
{
//global $connection;
$sql = 'INSERT INTO '. static::$tableName . ' SET '. self::buildNameParametersSQL();
$stmt = DatabaseHandler::factory()->prepare($sql);
$this->prepareValues($stmt);
return $stmt->execute(); // true of false
}
private static function update()
{
// global $connection;
$sql = 'UPDATE '. static::$tableName . ' SET '. self::buildNameParametersSQL(). ' WHERE '. static::$primaryKey .' = '.$this->{static::$primaryKey};
// $stmt = $connection->prepare($sql);
//$stmt = DatabaseHandler::factory()->prepare($sql);
$stmt = DatabaseHandler::factory()->prepare($sql);
$this->prepareValues($stmt);
return $stmt->execute(); // true of false
}
public function save()
{
return $this->{static::$primaryKey} === null ? $this->create() : $this->update();
}
public static function delete()
{
// global $connection;
$sql = 'DELETE FROM '. static::$tableName . ' WHERE '. static::$primaryKey .' = '.$this->{static::$primaryKey};
// $stmt = $connection->prepare($sql);
$stmt = DatabaseHandler::factory()->prepare($sql);
return $stmt->execute(); // true of false
}
public static function getAll()
{
// global $connection;
$sql = 'SELECT * FROM '. static::$tableName;
//$stmt = $connection->prepare($sql);
$stmt = DatabaseHandler::factory()->prepare($sql);
//return $connection->execute() === true ? $stmt->fetchAll(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, 'Employee', array('name', 'age', 'address', 'tax', 'salary')) : false;
//using fetchAll with this paramaters return values as OBJECT Of class which returned by get_called_calss() which called this method
$stmt->execute();
$result = $stmt->fetchAll(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, get_called_class(), array_keys(static::$tableSchema));
return is_array($result) && !empty($result) === true ? $result : false;
}
public static function getByPk($pk)
{
//global $connection;
$sql = 'SELECT * FROM '. static::$tableName. ' WHERE '. static::$primaryKey .' = '.$pk;
//$stmt = $connection->prepare($sql);
//$stmt = DatabaseHandler::factory()->prepare($sql);
$stmt = DatabaseHandler::factory()->prepare($sql);
//return $connection->execute() === true ? $stmt->fetchAll(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, 'Employee', array('name', 'age', 'address', 'tax', 'salary')) : false;
//using fetchAll with this paramaters return values as OBJECT Of class which returned by get_called_calss() which called this method
if($connection->execute() === true)
{
$obj = $stmt->fetchAll(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, get_called_class(), array_keys(static::$tableSchema));
return array_shift($obj);
}
return false;
}
public static function get($sql, $options = array())
{
/*
* example:
* $emps = Employee::get(
* 'SELECT name, age FROM employees WHERE age = :age',
* array(
* 'age' => array(Employee::DATA_TYPE_INT, 34)
* )
* )
* var_dump($emps)
*/
//global $connection;
//$stmt = $connection->prepare($sql);
$stmt = DatabaseHandler::factory()->prepare($sql);
if(!empty($options))
{
foreach ($options as $columnName => $type)
{
//$type[0] = datatype, $type[1] = columname
if($type[0] == 4)
{
$sanitizedValue = filter_var($type[1], FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
$stmt->bindValue(":{$columnName}", $sanitizedValue);
}
else
{
$stmt->bindValue(":{$columnName}", $type[1], $type[0]);
}
}
}
$stmt->execute();
$result = $stmt->fetchAll(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, get_called_class(), array_keys(static::$tableSchema));
return is_array($result) && !empty($result) === true ? $result : false;
/*
if(method_exists(get_called_class(), '__construct')){
$result = $stmt->fetchAll(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, get_called_class(), array_keys(static::$tableSchema));
//return is_array($result) && !empty($result) === true ? $result : false;
} else {
$result =$stmt->fetchAll(\PDO::FETCH_CLASS, get_called_class());
}
if((is_array($result) && !empty($result))){
$generator = function() use ($result){};
return $generator;
}
return false;
*/
}
}
employeecontroller.php
<?php
/**
* Description of abstractcontroller
*
* @author Mohamed Hassn Elmetwaly (25-03-2017)
* mhe.developer@gmail.com
*/
namespace BATRAHOSTMVC\Controllers;
use BATRAHOSTMVC\Models\EmployeeModel;
class EmployeeController extends AbstractController
{
public function defaultAction()
{
//EmployeeModel::getAll();
var_dump(EmployeeModel::getAll());
$this->_view();
}
}
employeemodel.php
<?php
namespace BATRAHOSTMVC\Models;
//use BATRAHOSTMVC\Models\AbstractModel;
//use BATRAHOSTMVC\Models\AbstractModel;
/**
* Description of employee
* @author Mohamed Hassn Elmetwaly (25-03-2017)
* mhe.developer@gmail.com
*/
class EmployeeModel extends AbstractModel
{
public $id;
public $name;
public $age;
public $address;
public $tax;
public $salary;
public static $db;
protected static $tableName = 'employees';
protected static $tableSchema = array(
'name' => self::DATA_TYPE_STR,
'age' => self::DATA_TYPE_INT,
'address' => self::DATA_TYPE_STR,
'tax' => self::DATA_TYPE_DECIMAL,
'salary' => self::DATA_TYPE_DECIMAL
);
protected static $primaryKey = 'id';
public function __construct($name, $age, $address, $tax, $salary) {
$this->name = $name;
$this->age = $age;
$this->address = $address;
$this->tax = $tax;
$this->salary = $salary;
}
public function __get($prop){
$this->$prop;
}
public function getTableName(){
return self::$tableName;
}
}
autoload.php
<?php
namespace BATRAHOSTMVC\LIB;
/*
* Applcation Constants
*/
/*
define('DS', DIRECTORY_SEPARATOR);
define('APP_PATH', dirname(realpath(__FILE__)).DS.'..');
define('PS', PATH_SEPARATOR);
define('CONTROLLER_PATH', APP_PATH.DS.'controllers');
define('MODEL_PATH', APP_PATH.DS.'models');
//echo CONTROLLER_PATH;
$path = get_include_path().PS.CONTROLLER_PATH.PS.MODEL_PATH;
set_include_path($path);
*/
class Autoload
{
public static function autoload($classname)
{
/* in Explanation */
$classname = str_replace('BATRAHOSTMVC', '',$classname);
$classname = str_replace('\\', '/', $classname);
$classname = $classname.'.php';
$classname = strtolower($classname);
if(file_exists(APP_PATH.$classname))
{
require_once APP_PATH.$classname;
}
/*
$class = str_replace('\\', '/', $classname);
$classFile = APP_PATH.DIRECTORY_SEPARATOR.strtolower($class).'.php';
if(file_exists($classFile))
{
require $classFile;
}
else
{
return;
}
*/
}
}
spl_autoload_register(__NAMESPACE__.'\Autoload::autoload');
frontcontroller.php
<?php
namespace BATRAHOSTMVC\LIB;
class FrontController
{
const NOT_FOUND_ACTION = 'notFoundAction';
const NOT_FOUND_CONTROLLER = 'BATRAHOSTMVC\Controllers\NotFoundController';
private $_controller = 'index';
private $_action = 'default';
private $_params = array();
public function __construct() {
$this->_parseUrl();
}
private function _parseUrl()
{
$url = explode('/', trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH),'/'), 3);
var_dump($url);
if(isset($url[0]) && $url[0] !='')
{
$this->_controller = $url[0];
}
if(isset($url[1]) && $url[1] !='')
{
$this->_action = $url[1];
}
if(isset($url[2]) && $url[2] !='')
{
$this->_params = explode('/', $url[2]);
}
// @list($this->_controller, $this->_action, $this->_params) = explode('/', trim($url, '/'),3);
// $this->_params = explode('/', $this->_params);
var_dump($this);
}
public function dispatch()
{
$controllerClassName = 'BATRAHOSTMVC\Controllers\\'.ucfirst($this->_controller).'Controller';
$actionName = $this->_action.'Action';
if(!class_exists($controllerClassName))
{
$controllerClassName = self::NOT_FOUND_CONTROLLER;
}
$controller = new $controllerClassName();
if(!method_exists($controller, $actionName))
{
$this->_action = $actionName = self::NOT_FOUND_ACTION;
}
$controller->setController($this->_controller);
$controller->setAction($this->_action);
$controller->setParams($this->_params);
$controller->$actionName();
}
}
我在以下链接中附加了我的文件 http://www.mediafire.com/file/mdbxj5o3f6hd3gz/mvcyahia%285-4-2017%29.rar
提前致谢
答案 0 :(得分：0)
public static function getInstance() {
if(self::$_instance === null){
self::$_instance = new self();
}
// here was the confusing the old value was return self::$_instance
return self::$_handler;
}
答案 1 :(得分：-1)
您的数据库/查询对象为空。因此，找到如何调用数据库对象，以便调用其方法。
您的代码显示没有为您的db类定义prepare（）方法。
您正在将PDODatabaseHandler :: _ handler属性设置为PDO，但是当您返回self（）时。得到它？