Adapters/BaseDBAdapter.php
public function escape($value) {
        if (is_array($value)) {
            $res = '';
            if (count($value) == 0) return 'null';
            foreach($value as $val) {
                $res .= $this->escapeOne($val).',';
            }
            $res = substr($res, 0, -1);
            return $res;
        } else {
            return $this->escapeOne($value);
        }
    }
public function escape($value) {
        if (is_array($value)) {
            $res = '';
            if (count($value) == 0) return 'null';
            foreach($value as $val) {
                $res .= $this->escapeOne($val).',';
            }
            $res = substr($res, 0, -1);
            return $res;
        } else {
            return $this->escapeOne($value);
        }
    }
Escape values for using in queries

@param mixed $value to be escaped
@return mixed $value  Escaped