Custom Sugar Logic function for retrieving YTD value

GetYTDValueExpression.php

<?php

/* File: ./custom/include/Expressions/Expression/String/GetYTDValueExpression.php */

require_once('include/Expressions/Expression/String/StringExpression.php');

class GetYTDValueExpression extends StringExpression
{

	function evaluate() {
		$account_id = $this->context->id;
	
		$q = "select round(sum(amount)) as ytdvalue from opportunities o ";
		$q .= "join accounts_opportunities ao ";
		$q .= "on o.id = ao.opportunity_id ";
		$q .= "and ao.account_id = '{$account_id}' ";
		$q .= "and ao.deleted = 0 ";
		$q .= "and o.deleted = 0 ";
		$q .= "and o.sales_stage = 'Closed Won' ";
		$q .= "and year(o.date_entered) = year(curdate()) ";
		
		$results = $this->context->db->query($q, true);
		$row = $this->context->db->fetchByAssoc($results);
		$ytdvalue = $row['ytdvalue'];
	
		return $ytdvalue;
	}

	static function getJSEvaluate() {
		return <<<EOQ
		    var s = '';

		    return s;
EOQ;
	}

	static function getOperationName() {
		return "GetYTDValue";
	}

	static function getParamCount() {
		return 0;
	}
    
}

?>

My original thought was to use SugarQuery for it but then shied away from it as I still need the RAW on the SELECT to use SUM(). I'll revisit over the next couple of days and advise.