Merge branch 'development' into h-node

3 files changed, 899 insertions, 0 deletions

diff --git a/Library/Db/Mysql.php b/Library/Db/Mysql.php
new file mode 100755
index 0000000..4561a1b
--- /dev/null
+++ b/Library/Db/Mysql.php
@@ -0,0 +1,446 @@
+<?php
+
+// EasyGiant is a PHP framework for creating and managing dynamic content
+//
+// Copyright (C) 2009 - 2011  Antonio Gallo
+// See COPYRIGHT.txt and LICENSE.txt.
+//
+// This file is part of EasyGiant
+//
+// EasyGiant is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// EasyGiant is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with EasyGiant.  If not, see <http://www.gnu.org/licenses/>.
+
+if (!defined('EG')) die('Direct access not allowed!');
+
+//class to manage the database
+//singleton!
+class Db_Mysql {
+	
+	public $query = null; //the last query executed
+	public $charsetError = true; //true: non eccor occurred during the modification of the connection charset, false: one error occurred
+	public $charset = null; //the charset of the client connection
+	
+	private static $instance = null; //instance of this class
+
+	private $dblink;
+	private $fieldsType = array('tinyint','smallint','int','mediumint','bigint','float','double');
+	/**
+
+	*connect to the database
+	*'host','user','password','db_name'
+
+	*/
+
+	//PHP-Mysql charset translation table
+	private $charsetTranslationTable = array(
+		'UTF-8'			=>	'utf8',
+		'ISO-8859-1'	=>	'latin1',
+		'EUC-JP'		=>	'ujis',
+		'SJIS'			=>	'sjis'
+	);
+	
+	private function __construct($host,$user,$pwd,$db_name)
+	{
+
+		$this->dblink = mysql_connect($host,$user,$pwd);
+
+  		if ($this->dblink === FALSE) {
+			die ("Connection error. Verify parameters in config.php");
+		}
+
+		$db2 = mysql_select_db($db_name, $this->dblink)
+			or die ("Database selection error. Verify parameters in config.php");
+		
+		$charset = array_key_exists(DEFAULT_CHARSET,$this->charsetTranslationTable) ? $this->charsetTranslationTable[DEFAULT_CHARSET] : 'utf8';
+			
+		if (!@mysql_set_charset($charset,$this->dblink)) $this->charsetError = false;
+		
+		$this->charset = mysql_client_encoding();
+	}
+
+	public static function getInstance($host = null, $user = null, $pwd = null, $db_name = null)
+	{
+		if (!isset(self::$instance)) {
+			$className = __CLASS__;
+			self::$instance = new $className($host,$user,$pwd,$db_name);
+		}
+
+		return self::$instance;
+	}
+
+
+	//close the connection
+	public function disconnect()
+	{
+		mysql_close($this->dblink);
+	}
+
+	//the text of the error message from previous MySQL operation
+	public function getError()
+	{
+		return mysql_error($this->dblink);
+	}
+
+	//the numerical value of the error message from previous MySQL operation
+	public function getErrno()
+	{
+		return mysql_errno($this->dblink);
+	}
+
+	public function getJoinString($string)
+	{
+		if (strstr($string,':'))
+		{
+			$tArray = explode(':',$string);
+			switch($tArray[0])
+			{
+				case 'i':
+					$jString = ' INNER JOIN ' . $tArray[1];
+					break;
+				case 'l':
+					$jString = ' LEFT JOIN ' . $tArray[1];
+					break;
+				case 'r':
+					$jString = ' RIGHT JOIN ' . $tArray[1];
+					break;
+				default:
+					$jString = ' INNER JOIN ' . $tArray[1];
+					break;
+			}
+			return $jString;
+		}
+		else
+		{
+			return ' INNER JOIN '.$string;
+		}
+	}
+	
+	public function createSelectQuery($table,$fields='*',$where=null,$group_by=null,$order_by=null,$limit=null,$on=array(),$using=array(),$join=array())
+	{
+		$maxValue = max(count($on),count($using),count($join));
+
+		$joinString = null;
+		for ($i=0; $i < $maxValue; $i++)
+		{
+			$joinString .= isset($join[$i]) ? $this->getJoinString($join[$i]) : null;
+			if (isset($using[$i]))
+			{
+				$joinString .= ' USING ('.$using[$i].')';
+			}
+			else if (isset($on[$i]))
+			{
+				$joinString .= ' ON '.$on[$i];
+			}
+		}
+
+		if (isset($where))
+		{
+			$where='WHERE '.$where;
+		}
+		if (isset($order_by)) {
+			$order_by='ORDER BY '.$order_by;
+		}
+		if (isset($group_by)) {
+			$group_by='GROUP BY '.$group_by;
+		}
+		if (isset($limit)) {
+			$limit='LIMIT '.$limit;
+		}
+
+		$query="SELECT $fields FROM $table $joinString $where $group_by $order_by $limit;";
+		return $query;
+	}
+	
+	public function get_num_rows($table,$where=null,$group_by=null,$on=array(),$using=array(),$join=array()) {
+
+		$query = $this->createSelectQuery($table,'*',$where,$group_by,null,null,$on,$using,$join);
+		
+		$this->query=$query;
+		
+		$ris = mysql_query($query);
+		if ($ris) {
+			$num_rows = mysql_num_rows($ris);
+			return $num_rows;
+		} else {
+			return false;
+		}
+	}
+
+	//get the maximum value of the field $field of the table $table having the $where conditions
+	public function getMath($func,$table,$field,$where=null,$group_by = null, $on=array(),$using=array(),$join=array())
+	{
+		$query = $this->createSelectQuery($table,"$func($field) AS m",$where,$group_by,null,null,$on,$using,$join);
+		
+		$this->query = $query;
+		$result = mysql_query($query);
+		if ($result)
+		{
+			$row = mysql_fetch_array($result);
+			return $row['m'];
+		}
+		else
+		{
+			return false;
+		}
+	}
+
+	//get the maximum value of the field $field of the table $table having the $where conditions
+	public function getMax($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('MAX',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+
+	//get the minimum value of the field $field of the table $table having the $where conditions
+	public function getMin($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('MIN',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+
+	//get the sum of the fields
+	public function getSum($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('SUM',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+
+	//get the average of the fields
+	public function getAvg($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('AVG',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+	
+	public function select($table,$fields='*',$where=null,$group_by=null,$order_by=null,$limit=null,$on=array(),$using=array(),$join=array())
+	{
+		$query = $this->createSelectQuery($table,$fields,$where,$group_by,$order_by,$limit,$on,$using,$join);
+
+		$this->query = $query;
+		$result = mysql_query($query);
+		return $this->getData($result);
+	}
+
+
+// 	public function select($table,$fields='*',$where=null,$group_by=null,$order_by=null,$limit=null) {
+// 		$query = $this->selectQuery($table,$fields,$where,$group_by,$order_by,$limit);
+// 		return $this->getData($query);
+// 	}
+
+
+	//obtain an associative array containing the result values (keys:tableName_fieldsName)
+	//$par = 'single/multi' single table,multi table
+	public function getData($result)
+	{
+		$data = array(); //data from the query
+		$temp = array(); //temporary array (values of a single record)
+// 		$result = mysql_query($query);
+		if ($result)
+		{
+			$fieldsNumber = mysql_num_fields($result);
+			while ($row = mysql_fetch_array($result))
+			{
+				for ($i = 0;$i < $fieldsNumber;$i++)
+				{
+					$tableName = mysql_field_table($result, $i);
+					if (strcmp($tableName,'') === 0) $tableName = Params::$aggregateKey;
+					$fieldName = mysql_field_name($result, $i);
+					$temp[$tableName][$fieldName] = $row[$i];
+				}
+				array_push($data,$temp);
+			}
+			return $data;
+		}
+		else
+		{
+			return false;
+		}
+	}
+
+	//return an array containing all the types of the fields (indicated in $fields) of a table (indicated in $table)
+	public function getTypes($table, $fields)
+	{
+		$query = "DESCRIBE $table;";
+		$result = mysql_query($query);
+		$temp = array();
+		while ($row = mysql_fetch_assoc($result)) {
+			$temp[$row['Field']] = reset(explode('(',$row['Type']));
+		}
+
+		$types = array();
+		$fields = explode(',',$fields);
+		for ($i = 0; $i < count($fields); $i++)
+		{
+			if (!array_key_exists($fields[$i],$temp)) return false;
+			$types[] = $temp[$fields[$i]];
+		}
+
+		return $types;
+	}
+
+	public function insert($table,$fields,$values) {
+
+		#$table is a string
+		#$fields has to be a string with comma as separator: name1,name2,...
+		#$values has to be an array
+		$values = array_values($values);
+		if (strcmp($fields,'') !== 0)
+		{
+			//get the type of the fields
+			$types = $this->getTypes($table,$fields);
+			if (!$types) return false;
+			
+			for($i = 0; $i < count($values); $i++)
+			{
+				if (!in_array($types[$i],$this->fieldsType))
+				{
+					$values[$i] = '"'.$values[$i].'"';
+				}
+				else
+				{
+					if (strcmp($values[$i],'') === 0) $values[$i] = '"'.$values[$i].'"';
+				}
+			}
+
+			$values = implode(',',$values);
+			$query="INSERT INTO $table ($fields) VALUES ($values);";
+			$this->query = $query;
+			$ris = mysql_query($query);
+
+			#check the result
+			if ($ris) {
+				return true;
+			} else {
+				return false;
+			}
+
+		} else {
+			return false;
+		}
+	}
+
+	// 	Retrieves the ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT). 
+	public function lastId()
+	{
+		return mysql_insert_id();
+	}
+
+	public function update($table,$fields,$values,$where) {
+
+		#$table and $where are two strings
+		#$fields has to be a string with comma as separator: name1,name2,...
+		#$values has to be an array
+		$values = array_values($values);
+// 		if (isset($where)) {
+			$where='WHERE '.$where;
+// 		}
+		#get the array from the $fields string
+		if (strcmp($fields,'') !== 0)
+		{
+			//get the type of the fields
+			$types = $this->getTypes($table,$fields);
+			if (!$types) return false;
+			
+			$fields=explode(',',$fields);
+			$str=array();
+
+			for ($i=0;$i<count($fields);$i++) {
+				if (!in_array($types[$i],$this->fieldsType))
+				{
+					$values[$i] = '"'.$values[$i].'"';
+				}
+				else
+				{
+					if (strcmp($values[$i],'') === 0) $values[$i] = '"'.$values[$i].'"';
+				}
+				$str[$i]= $fields[$i].'='.$values[$i];
+			}
+
+			#set the string name1=value1,name2=...
+			$str=implode(',',$str);
+			$query="UPDATE $table SET $str $where;";
+			$this->query=$query;
+			$ris = mysql_query($query);
+
+			#check the result
+			if ($ris) {
+				return true;
+			} else {
+				return false;
+			}
+		} else {
+			return false;
+		}
+
+	}
+
+
+	public function del($table,$where) {
+
+		#$table and $where are two strings
+// 		if (isset($where)) {
+			$where='WHERE '.$where;
+// 		}
+		$query="DELETE FROM $table $where;";
+		$this->query=$query;
+		$ris = mysql_query($query);
+		#check the result
+
+		if ($ris) {
+			return true;
+		} else {
+			return false;
+		}
+
+	}
+
+	// 	function to check if exist the record having the field $id_name=$id_value
+	public function recordExists($table,$fieldName,$fieldValue,$where = null,$groupBy=null,$on=array(),$using=array(),$join=array())
+	{
+		if (isset($where))
+		{
+			$where=' AND '.$where;
+		}
+
+		$fieldValue = '"'.$fieldValue.'"';
+
+		$num=$this->get_num_rows($table,$fieldName.'='.$fieldValue.$where,$groupBy,$on,$using,$join);
+		$res=($num>0) ? true : false;
+		return $res;
+
+	}
+
+
+	//send a generic query to the database
+	//$query: the query to be sent
+	public function query($query)
+	{
+		$this->query = $query;
+		$result = mysql_query($query);
+		if ($result === false)
+		{
+			return false;
+		}
+		else if ($result === true)
+		{
+			return true;
+		}
+		else if (@get_resource_type($result))
+		{
+			return $this->getData($result);
+		}
+	}
+
+	// Prevent users to clone the instance
+	public function __clone()
+	{
+		throw new Exception('error in '. __METHOD__.': clone is not allowed');
+	}
+
+}
\ No newline at end of file
diff --git a/Library/Db/Mysqli.php b/Library/Db/Mysqli.php
new file mode 100644
index 0000000..df57a54
--- /dev/null
+++ b/Library/Db/Mysqli.php
@@ -0,0 +1,452 @@
+<?php
+
+// EasyGiant is a PHP framework for creating and managing dynamic content
+//
+// Copyright (C) 2009 - 2011  Antonio Gallo
+// See COPYRIGHT.txt and LICENSE.txt.
+//
+// This file is part of EasyGiant
+//
+// EasyGiant is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// EasyGiant is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with EasyGiant.  If not, see <http://www.gnu.org/licenses/>.
+
+if (!defined('EG')) die('Direct access not allowed!');
+
+//class to manage the database
+//singleton!
+class Db_Mysqli
+{
+	
+	public $query = null; //the last query executed
+	public $charsetError = true; //true: non eccor occurred during the modification of the connection charset, false: one error occurred
+	public $charset = null; //the charset of the client connection
+
+	private static $instance = null; //instance of this class
+
+	private $db;
+	private $fieldsType = array('tinyint','smallint','int','mediumint','bigint','float','double');
+
+	//PHP-Mysql charset translation table
+	private $charsetTranslationTable = array(
+		'UTF-8'			=> 	'utf8',
+		'ISO-8859-1'	=> 	'latin1',
+		'EUC-JP'		=>	'ujis',
+		'SJIS'			=>	'sjis'
+	);
+	
+	/**
+
+	*connect to the database
+	*'host','user','password','db_name'
+
+	*/
+
+	private function __construct($host,$user,$pwd,$db_name)
+	{
+
+		$this->db = new mysqli($host,$user,$pwd,$db_name);
+
+		if (mysqli_connect_error())
+		{
+			die('Connect Error (' . mysqli_connect_errno() . ') ' . mysqli_connect_error());
+		}
+		
+		$charset = array_key_exists(DEFAULT_CHARSET,$this->charsetTranslationTable) ? $this->charsetTranslationTable[DEFAULT_CHARSET] : 'utf8';
+		
+		if (!@$this->db->set_charset($charset)) $this->charsetError = false;
+		
+		$this->charset = $this->db->character_set_name();
+
+	}
+
+	//return the $this->db property
+	public function getDb()
+	{
+		return $this->db;
+	}
+
+	public static function getInstance($host = null, $user = null, $pwd = null, $db_name = null)
+	{
+		if (!isset(self::$instance)) {
+			$className = __CLASS__;
+			self::$instance = new $className($host,$user,$pwd,$db_name);
+		}
+
+		return self::$instance;
+	}
+
+
+	//close the connection
+	public function disconnect()
+	{
+		$this->db->close();
+	}
+
+	//the text of the error message from previous MySQL operation
+	public function getError()
+	{
+		return $this->db->error;
+	}
+
+	//the numerical value of the error message from previous MySQL operation
+	public function getErrno()
+	{
+		return $this->db->errno;
+	}
+
+	public function getJoinString($string)
+	{
+		if (strstr($string,':'))
+		{
+			$tArray = explode(':',$string);
+			switch($tArray[0])
+			{
+				case 'i':
+					$jString = ' INNER JOIN ' . $tArray[1];
+					break;
+				case 'l':
+					$jString = ' LEFT JOIN ' . $tArray[1];
+					break;
+				case 'r':
+					$jString = ' RIGHT JOIN ' . $tArray[1];
+					break;
+				default:
+					$jString = ' INNER JOIN ' . $tArray[1];
+					break;
+			}
+			return $jString;
+		}
+		else
+		{
+			return ' INNER JOIN '.$string;
+		}
+	}
+	
+	public function createSelectQuery($table,$fields='*',$where=null,$group_by=null,$order_by=null,$limit=null,$on=array(),$using=array(),$join=array())
+	{
+		$maxValue = max(count($on),count($using),count($join));
+
+		$joinString = null;
+		for ($i=0; $i < $maxValue; $i++)
+		{
+			$joinString .= isset($join[$i]) ? $this->getJoinString($join[$i]) : null;
+			if (isset($using[$i]))
+			{
+				$joinString .= ' USING ('.$using[$i].')';
+			}
+			else if (isset($on[$i]))
+			{
+				$joinString .= ' ON '.$on[$i];
+			}
+		}
+		
+		if (isset($where))
+		{
+			$where='WHERE '.$where;
+		}
+		if (isset($order_by)) {
+			$order_by='ORDER BY '.$order_by;
+		}
+		if (isset($group_by)) {
+			$group_by='GROUP BY '.$group_by;
+		}
+		if (isset($limit)) {
+			$limit='LIMIT '.$limit;
+		}
+
+		$query="SELECT $fields FROM $table $joinString $where $group_by $order_by $limit;";
+		return $query;
+	}
+	
+	public function get_num_rows($table,$where=null,$group_by=null,$on=array(),$using=array(),$join=array()) {
+
+		$query = $this->createSelectQuery($table,'*',$where,$group_by,null,null,$on,$using,$join);
+
+		$this->query = $query;
+		$ris = $this->db->query($query);
+		if ($ris) {
+			$num_rows = $ris->num_rows;
+			$ris->close();
+			return $num_rows;
+		} else {
+			return false;
+		}
+	}
+
+	public function getMath($func,$table,$field,$where=null,$group_by = null, $on=array(),$using=array(),$join=array())
+	{
+		$query = $this->createSelectQuery($table,"$func($field) AS m",$where,$group_by,null,null,$on,$using,$join);
+
+		$this->query = $query;
+		$result = $this->db->query($query);
+		if ($result)
+		{
+			$row = $result->fetch_array();
+			$result->close();
+			return $row['m'];
+		}
+		else
+		{
+			return false;
+		}
+	}
+
+	//get the maximum value of the field $field of the table $table having the $where conditions
+	public function getMax($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('MAX',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+
+	//get the minimum value of the field $field of the table $table having the $where conditions
+	public function getMin($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('MIN',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+
+	//get the sum of the fields
+	public function getSum($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('SUM',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+
+	//get the average of the fields
+	public function getAvg($table,$field,$where=null,$group_by = null,$on=array(),$using=array(),$join=array())
+	{
+		return $this->getMath('AVG',$table,$field,$where,$group_by,$on,$using,$join);
+	}
+	
+	public function select($table,$fields='*',$where=null,$group_by=null,$order_by=null,$limit=null,$on=array(),$using=array(),$join=array())
+	{
+		$query = $this->createSelectQuery($table,$fields,$where,$group_by,$order_by,$limit,$on,$using,$join);
+		
+		$this->query = $query;
+		$result = $this->db->query($query);
+		return $this->getData($result);
+	}
+
+
+// 	public function select($table,$fields='*',$where=null,$group_by=null,$order_by=null,$limit=null) {
+// 		$query = $this->selectQuery($table,$fields,$where,$group_by,$order_by,$limit);
+// 		return $this->getData($query);
+// 	}
+
+
+	//obtain an associative array containing the result values (keys:tableName_fieldsName)
+	//$par = 'single/multi' single table,multi table
+	public function getData($result) {
+		$data = array(); //data from the query
+		$temp = array(); //temporary array (values of a single record)
+// 		$result = $this->db->query($query);
+		if ($result) {
+			$fieldsNumber = $result->field_count;
+			while ($row = $result->fetch_array()) {
+				for ($i = 0;$i < $fieldsNumber;$i++) {
+					$finfo = $result->fetch_field_direct($i);
+					$tableName = $finfo->table;
+					if (strcmp($tableName,'') === 0) $tableName = Params::$aggregateKey;
+					$fieldName = $finfo->name;
+					$temp[$tableName][$fieldName] = $row[$i];
+				}
+				array_push($data,$temp);
+			}
+			$result->close();
+			return $data;
+		} else {
+			return false;
+		}
+	}
+
+	//return an array containing all the types of the fields (indicated in $fields) of a table (indicated in $table)
+	public function getTypes($table, $fields)
+	{
+		$query = "DESCRIBE $table;";
+		$result = $this->db->query($query);
+		$temp = array();
+		while ($row = $result->fetch_assoc()) {
+			$temp[$row['Field']] = reset(explode('(',$row['Type']));
+		}
+		$result->close();
+
+		$types = array();
+		$fields = explode(',',$fields);
+		for ($i = 0; $i < count($fields); $i++)
+		{
+			if (!array_key_exists($fields[$i],$temp)) return false;
+			$types[] = $temp[$fields[$i]];
+		}
+
+		return $types;
+	}
+	
+	public function insert($table,$fields,$values) {
+
+		#$table is a string
+		#$fields has to be a string with comma as separator: name1,name2,...
+		#$values has to be an array
+		$values = array_values($values);
+		if (strcmp($fields,'') !== 0)
+		{
+			//get the type of the fields
+			$types = $this->getTypes($table,$fields);
+			if (!$types) return false;
+			
+			for($i = 0; $i < count($values); $i++)
+			{
+				if (!in_array($types[$i],$this->fieldsType))
+				{
+					$values[$i] = '"'.$values[$i].'"';
+				}
+				else
+				{
+					if (strcmp($values[$i],'') === 0) $values[$i] = '"'.$values[$i].'"';
+				}
+			}
+
+			$values = implode(',',$values);
+			$query="INSERT INTO $table ($fields) VALUES ($values);";
+			$this->query=$query;
+
+			$ris = $this->db->query($query);
+
+			#check the result
+			if ($ris) {
+				return true;
+			} else {
+				return false;
+			}
+
+		} else {
+			return false;
+		}
+	}
+
+	// 	Retrieves the ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT). 
+	public function lastId()
+	{
+		return $this->db->insert_id;
+	}
+	
+	public function update($table,$fields,$values,$where) {
+
+		#$table and $where are two strings
+		#$fields has to be a string with comma as separator: name1,name2,...
+		#$values has to be an array
+		$values = array_values($values);
+// 		if (isset($where)) {
+			$where='WHERE '.$where;
+// 		}
+		#get the array from the $fields string
+		if (strcmp($fields,'') !== 0)
+		{
+			//get the type of the fields
+			$types = $this->getTypes($table,$fields);
+			if (!$types) return false;
+			
+			$fields = explode(',',$fields);
+			$str = array();
+
+			for ($i=0;$i<count($fields);$i++) {
+				if (!in_array($types[$i],$this->fieldsType))
+				{
+					$values[$i] = '"'.$values[$i].'"';
+				}
+				else
+				{
+					if (strcmp($values[$i],'') === 0) $values[$i] = '"'.$values[$i].'"';
+				}
+				$str[$i]= $fields[$i].'='.$values[$i];
+			}
+
+			#set the string name1=value1,name2=...
+			$str=implode(',',$str);
+			$query="UPDATE $table SET $str $where;";
+			$this->query=$query;
+			$ris = $this->db->query($query);
+
+			#check the result
+			if ($ris) {
+				return true;
+			} else {
+				return false;
+			}
+		} else {
+			return false;
+		}
+
+	}
+
+
+	public function del($table,$where) {
+
+		#$table and $where are two strings
+// 		if (isset($where)) {
+			$where='WHERE '.$where;
+// 		}
+		$query="DELETE FROM $table $where;";
+		$this->query=$query;
+		$ris = $this->db->query($query);
+		#check the result
+
+		if ($ris) {
+			return true;
+		} else {
+			return false;
+		}
+
+	}
+
+
+	//function to check if exist the record having the field $id_name=$id_value
+	public function recordExists($table,$fieldName,$fieldValue,$where = null,$groupBy=null,$on=array(),$using=array(),$join=array())
+	{
+		if (isset($where))
+		{
+			$where=' AND '.$where;
+		}
+
+		$fieldValue = '"'.$fieldValue.'"';
+
+		$num = $this->get_num_rows($table,$fieldName.'='.$fieldValue.$where,$groupBy,$on,$using,$join);
+		$res=($num>0) ? true : false;
+		return $res;
+
+	}
+
+
+	//send a generic query to the database
+	//$query: the query to be sent
+	public function query($query)
+	{
+		$this->query = $query;
+		$result = $this->db->query($query);
+		if ($result === true)
+		{
+			return true;
+		}
+		else if ($result === false)
+		{
+			return false;
+		}
+		else if ($result instanceof MySQLi_Result)
+		{
+			return $this->getData($result);
+		}
+	}
+
+	// Prevent users to clone the instance
+	public function __clone()
+	{
+		throw new Exception('error in '. __METHOD__.': clone is not allowed');
+	}
+	
+}
\ No newline at end of file
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+