public function executeProcedure($strProcName, $params = null)
    {
        $strParams = '';
        if ($params) {
            $a = array_map(function ($val) {
                return $this->sqlVariable($val);
            }, $params);
            $strParams = implode(',', $a);
        }
        $strSql = "call {$strProcName}({$strParams})";
        return $this->multiQuery($strSql);
    }