CBPAllWorkflowPersister::RetrieveWorkflow: Bitrix method

      
<?php 
//  CBPAllWorkflowPersister :: RetrieveWorkflow()
//  /dist/bitrix/modules/bizproc/classes/general/workflowpersister.php:41

    protected function RetrieveWorkflow($instanceId, $silent = false)
    {
        global $DB;

        $queryCondition = $this->getLockerQueryCondition();

        $buffer = "";
        $dbResult = $DB->Query(
            "SELECT WORKFLOW, IF (".$queryCondition.", 'Y', 'N') as UPDATEABLE ".
            "FROM b_bp_workflow_instance ".
            "WHERE ID = '".$DB->ForSql($instanceId)."' "
        );
        if ($arResult = $dbResult->Fetch())
        {
            if ($arResult["UPDATEABLE"] == "Y" && !$silent)
            {
                $DB->Query(
                    "UPDATE b_bp_workflow_instance SET ".
                    "    OWNER_ID = '".$DB->ForSql($this->serviceInstanceId)."', ".
                    "    OWNED_UNTIL = ".$DB->CharToDateFunction(date($GLOBALS["DB"]->DateFormatToPHP(FORMAT_DATETIME), $this->GetOwnershipTimeout()))." ".
                    "WHERE ID = '".$DB->ForSql($instanceId)."'"
                );
            }
            elseif (!$silent)
            {
                throw new Exception(GetMessage("BPCGWP_WF_LOCKED"), \CBPRuntime::EXCEPTION_CODE_INSTANCE_LOCKED);
            }
            $buffer = $arResult["WORKFLOW"];
        }
        else
        {
            throw new Exception(GetMessage("BPCGWP_INVALID_WF"), \CBPRuntime::EXCEPTION_CODE_INSTANCE_NOT_FOUND);
        }

        return $buffer;
    }