$insert = "INSERT into books (
							id,
    						title,
							authors,
							isbn,
							pages,
							publisher,
							publication_date,
							image_small,
							image_medium,
							url_amazon,
							createdAt) 
						VALUES (
							NULL,
							'" . $hash{$key}{'title'} . "', 
							'" . $hash{$key}{'authors'} . "',  
							'" . $hash{$key}{'isbn'} . "',  
							'" . $hash{$key}{'pages'} . "',  
							'" . $hash{$key}{'publisher'} . "',  
							'" . $hash{$key}{'publication_date'} . "', 
							'" . $hash{$key}{'image_small'} . "',  
							'" . $hash{$key}{'image_medium'} . "',  
							'" . $hash{$key}{'url_amazon'} . "',   
						NULL)";  		

			$sth = $dbh->prepare($insert);