如何正確處理此pl / sql for循環中的異常？

Question

首先，我是PL / SQL的新手，所以我可能會錯過一些瑣碎的事情。

這是我在運行時遇到問題的一小段代碼-

FOR indx IN 1 .. arr.COUNT
    LOOP
        SELECT COUNT(*), ca.cities
        INTO tmp_count, affected_cities
        FROM PDB.utilities ca
        WHERE (ca.app_city_id           = cityid
        AND ca.app_plumbing_id = arr(indx))
        AND( BITAND(options1,2)        = 2
            OR BITAND(options1,1)          = 1)
        GROUP BY ca.cities;

        IF tmp_count                  >=0 THEN
             -- We have an affected app so collect metrics
            IF plumbings(indx_mv)  ='0Ci30000000GsBN' THEN
                count_wrigley:= count_wrigley+tmp_count;
            END IF;
            counter:= counter+tmp_count; --overall count. 
            tmp_count:=0;
            affected_cities:=null;
        END IF;

        EXCEPTION -- error thrown here !
            WHEN NO_DATA_FOUND THEN
                CONTINUE;
        END;  
    END LOOP; -- Error thrown here too. 

這是我的錯誤跟蹤-

Error report:
ORA-06550: line 64, column 13:
PLS-00103: Encountered the symbol "EXCEPTION" when expecting one of the following:

   ( begin case declare end exit for goto if loop mod null
   pragma raise return select update while with <an identifier>
   <a double-quoted delimited-identifier> <a bind variable> <<
   continue close current delete fetch lock insert open rollback
   savepoint set sql execute commit forall merge pipe purge
ORA-06550: line 68, column 11:
PLS-00103: Encountered the symbol "LOOP" when expecting one of the following:

   ;
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

值得注意的是，該塊僅在異常處理后失敗，否則將成功編譯。 所以我猜我在那兒做錯了嗎？

任何幫助將不勝感激！ 謝謝

Answer 1

EXCEPTION與BEGIN ... END塊對齊。 循環中沒有BEGIN，因此也不應該例外。

看起來異常的目的是抑制循環內的NO_DATA_FOUND錯誤。 因此，要解決此錯誤，您還需要在循環中放置一個BEGIN / END塊。 （嗯，您只有一個END而沒有BEGIN-您的代碼會在EXCEPTION塊中拋出）。

FOR indx IN 1 .. arr.COUNT
LOOP
    BEGIN 
        SELECT COUNT(*), ca.cities
        INTO tmp_count, affected_cities
        FROM PDB.utilities ca
        ....
    EXCEPTION 
          WHEN NO_DATA_FOUND THEN
             CONTINUE;
    END;  
END LOOP;