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