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<?php
/*---------------------------------------------------------------------------
		File name ............ common/includes/db.class.php
		Author ............... Antoine Lemoine
		Creation date ........ 02.09.2009
		Modification date .... 21.10.2009
---------------------------------------------------------------------------*/


function buildSafeQuery()
{
	global $global;
	$args = func_get_args();
	return $global->mysql_connection->buildSafeQuery($args);
}

class MysqlConnection
{
	var $link;
	var $dbconfig;
	var $var_types;

	function MysqlConnection($dbconfig)
	{
		$this->dbconfig = $dbconfig;
		$this->var_types = array('string','boolean','integer','double');
	}

	function connect()
	{
		if (!isset($this->link))
		{
			$this->link = mysql_connect($this->dbconfig['hostname'],$this->dbconfig['user'],$this->dbconfig['password']);
			if (!$this->link) trigger_error('MysqlConnection.buildSafeQuery() - mysql error : '.mysql_error(),E_USER_ERROR);
			mysql_select_db($this->dbconfig['base'], $this->link);
		}
	}

	function close()
	{
		if (isset($this->link)) mysql_close($this->link);
	}

	function buildSafeQuery()
	{
		$args = func_get_args();

		if (count($args)==0) trigger_error('buildSafeQuery() - not enough arguments',E_USER_ERROR);
		if (count($args)==1) $args = $args[0];
		if (gettype($args[0])!='string') trigger_error('buildSafeQuery() - first argument must be a string',E_USER_ERROR);
		
		$this->connect();

		if (count($args)==2 && gettype($args[1])=='array')
		{
			$params = array();
			for ($i=0; $i<count($args[1]); $i++)
			{
				$value = $args[1][$i];
				$type = gettype($value);
				if (in_array($type,$this->var_types)) $params[] = escape($value);
				else trigger_error('buildSafeQuery() - unsupported data type `'.$type.'` for argument[1]['.$i.']',E_USER_ERROR);
			}
		}
		else
		{
			$params = array();
			for ($i=1; $i<count($args); $i++)
			{
				$value = $args[$i];
				$type = gettype($value);
				if (in_array($type,$this->var_types)) $params[] = escape($value);
				else trigger_error('buildSafeQuery() - unsupported data type `'.$type.'` for argument['.$i.']',E_USER_ERROR);
			}
		}
		return new Query(vsprintf($args[0],$params));
	}
}

class QueryResult
{
	var $numrows;
	var $error;
	var $rows;
	var $success;
	var $affected_rows;
	var $insert_id;

	function QueryResult($result, $query_string)
	{
		$this->rows = array();

		if (is_bool($result))
		{
			$this->result = null;
			$this->success = $result;
			$this->error = mysql_error();
			$this->numrows = 0;
			
			if ($this->error) trigger_error('QueryResult.QueryResult() - mysql error : '.$this->error.' ['.$query_string.']',E_USER_ERROR);
			else
			{
				$this->affected_rows = mysql_affected_rows();
				$this->insert_id = mysql_insert_id();
			}
		}
		else
		{
			$this->success = true;
			$this->affected_rows = mysql_affected_rows();
			$this->insert_id = mysql_insert_id();
			$this->numrows = mysql_numrows($result);
			for ($i=0; $i<$this->numrows; $i++)
			{
				$this->rows[$i] = mysql_fetch_array($result, MYSQL_ASSOC);
			}
		}
	}

	function getRow($i)
	{
		return isset($this->rows[$i]) ? $this->rows[$i] : null;
	}

	function isSuccess()
	{
		return $this->success;
	}

	function getAffectedRowsCount()
	{
		return $this->affected_rows;
	}

	function getInsertId()
	{
		return $this->insert_id;
	}
}

class Query
{
	var $query_str;
	var $result;

	function Query($query)
	{
		$this->query_str = $query;
		$this->mysql_connection = $mysql_connection;
	}
	
	function getResult()
	{
		$mysql_result = @mysql_query($this->query_str);
		$this->result = new QueryResult($mysql_result,$this->query_str);
		return $this->result;
	}
}

function escape($value)
{
	$type = gettype($value);
	if ($type=='string') return mysql_real_escape_string($value);
	else if (in_array($type,array('boolean','integer','double'))) return $value;
	else trigger_error('escape() - unsupported data type `'.$type.'`',E_USER_ERROR);
}

?>