class which generates all queries in php - php

Question

I'm creating a class in which MySQL queries will be generated automatically , but I've some problem ...
here is my Database class...
<?php
class Database {
var $host="localhost";
var $username="";
Var $password="";
var $database="";
var $fr_query;
var $row= array() ;
public function connect()
{
$conn= mysql_connect($this->host,$this->username,$this->password);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
}
public function db()
{
$conn_db = mysql_select_db($this->database);
if(! $conn_db )
{
echo 'Could Not Connect the Database';
}
}
public function run_query($sql)
{
$run = mysql_query($sql);
if(!$run)
{
throw new Exception("!!!!!Invalid query!!!!!!!");
}
$newId = mysql_insert_id();
if($newId)
{
return $newId;
}
return true;
}
public function fetchRow($fr)
{
if($fr)
{
$run = mysql_query($fr);
if($run)
{
return mysql_fetch_assoc($run);
}
}
return null;
}
function fetchAll($fr_query)
{
if($fr_query)
{
$run = mysql_query($fr_query);
if($run)
{
$data=array();
while($row=mysql_fetch_assoc($run))
{
$data[]=$row;
}
return $data;
}
}
return null;
}
}
$n = new Database();
$n->connect();
$n->db();
?>
and this is my test.php
<?php
include("database.php");
class Model_Abstract
{
protected $_data = array();
protected $_tableName = null;
protected $_primaryKey = null;
public function getTableName()
{
return $this->_tableName;
}
public function getPrimaryKey()
{
return $this->_primaryKey;
}
public function __set($key, $value = NULL)
{
$key = trim($key);
if(!$key)
{
throw new Exception('"$key" should not be empty.');
}
$this->_data[$key] = $value;
return $this;
}
public function __get($key)
{
$key = trim($key);
if(!$key)
{
throw new Exception('"$key" should not be empty.');
}
if(array_key_exists($key, $this->_data))
{
return $this->_data[$key];
}
return NULL;
}
public function insert()
{
print_r($this->_data);
$keyString = "`".implode("`,`", array_keys($this->_data))."`";
$valueString = "'".implode("','", array_keys($this->_data))."'";
echo $query = "INSERT INTO `{$this->getTableName()}` ({$keyString}) VALUES ({$valueString})";
$this->adpater()->run_query($query);
echo 'Inserted';
}
public function setData($data)
{
if(!is_array($data))
{
throw new Exception('"$data" should not be empty.');
}
$this->_data = $data;
return $this;
}
public function load($id, $key = null)
{
if(!is_int($id) && $id)
{
throw new Exception('"$id" should not be blank.');
}
if($id)
{
echo $query = "SELECT * FROM `{$this->getTableName()}` WHERE `{$this->getPrimaryKey()}` = '{$id}'";
$data[] = $this->adpater()->fetchRow($query);
$tabelName = $this->getTableName();
foreach($data as &$_data)
{
print_r($_data);
$object = new $tabelName();
$object->setData($_data);
$_data = $object;
}
print_r($data);
return $this;
/*
$query = "SELECT * FROM `{$this->getTableName()}` WHERE `{$this->getPrimaryKey()}` = '{$id}'";
$this->_data = $this->adpater()->fetchRow($query);
return $this; */
}
}
public function loadAll()
{
$query = "SELECT * FROM `{$this->getTableName()}`";
$data[] = $this->adpater()->fetchAll($query);
return $data;
}
public function delete($id, $key = null)
{
if(!is_int($id) && $id)
{
throw new Exception('"$id" should not be blank.');
}
if($id)
{
echo $query = "DELETE FROM `{$this->getTableName()}` WHERE `{$this->getPrimaryKey()}` = '{$id}'";
$data[] = $this->adpater()->run_query($query);
$tabelName = $this->getTableName();
$msg = 'Deleted Successfully....';
return $msg;
}
}
public function update()
{
print_r($this->_data);
$keyString = "`".implode("`,`", array_keys($this->_data))."`";
$valueString = "'".implode("','", array_keys($this->_data))."'";
echo $query = "UPDATE`{$this->getTableName()}` SET ({$keyString}) = ({$valueString}) WHERE `{$this->getPrimaryKey()}` = '{$id}'";
$this->adpater()->run_query($query);
echo 'Updated';
}
public function adpater()
{
return new Database();
}
}
class Product extends Model_Abstract
{
protected $_tableName = 'product';
protected $_primaryKey = 'product_id';
}
$product = new Product();
echo $product->name;
$product->insert();
print_r($product);
$product = new Product();
$product->name = 'Nokia Lumia';
$product->description = 'Windows';
$product->price = '15000';
$product->quantity = '12';
$product->sku = 'x2';
$product->status = '2';
$product->created_date = '0000-00-00 00:00:00';
$product->updated_date = ' ';
?>
So in here my problem is in Insert query, the values are same the column_name ...
I'm having Problem in loadAll();
the browser says "Catchable fatal error: Object of class Product could not be converted to string in"

Answer 1

$keyString = "`".implode("`,`", array_keys($this->_data))."`";
$valueString = "'".implode("','", array_keys($this->_data))."'";
Same lines, same value. Perhaps you meant
$keyString = "`".implode("`,`", array_keys($this->_data))."`";
$valueString = "'".implode("','", $this->_data) ."'";
Which would take the array keys for $keyString and the array values for $valueString.
Depreciation warning
mysql_* are deprecated functions. Use mysqli_* or PDO
Warning
This class does not protect you against SQL injections.