Oracle 中循环遍历某张表，并对符合条件的进行Update操作

BEGIN

FOR L_RECORD IN (select RECORD_ID,CURR_PERIOD,PERIOD_START_DATE, (sysdate- PERIOD_START_DATE) diffTime,(P.PERIOD_END_DAY-P.PERIOD_BEGIN_DAY) periodDiffDay from CPS_PATIENT_PATH_RECORD t1
inner join cps_treat_period p on p.Period_Id=t1.Curr_Period
where t1.path_state=1) 
LOOP
    IF (L_RECORD.DIFFTIME >=L_RECORD.periodDiffDay)    
      THEN 
        UPDATE CPS_PATIENT_PATH_RECORD
           SET PERIOD_START_DATE=to_date(to_char(sysdate,'YYYY/MM/DD'),'YYYY/MM/DD'),CURR_PERIOD =L_RECORD.CURR_PERIOD+1
         WHERE RECORD_ID=L_RECORD.RECORD_ID;
    END IF;
 END LOOP;
END;

格式：

FOR  record IN (SELECT)

LOOP

　　UPDATE T WHERE 

END LOOP