CREATE?TABLE?AREAS
(
??RADIUS??NUMBER(5),
??AREA????NUMBER(14,2)
);

方法一：使用 goto

DECLARE
???pi???CONSTANT?NUMBER?(9,?7)??:=?3.1415927;
???radius????????INTEGER?(5);
???area??????????NUMBER?(14,?2);
BEGIN
???radius?:=?0;

???LOOP

??????<<here>>
??????radius?:=?radius?+?1;

??????IF?radius?=?4
??????THEN
?????????GOTO?here;
??????ELSE
?????????area?:=?pi?*?POWER?(radius,?2);

?????????INSERT?INTO?areas
??????????????VALUES?(radius,?area);

?????????EXIT?WHEN?area?>?100;
??????END?IF;
???END?LOOP;

???COMMIT;
EXCEPTION
???WHEN?OTHERS
???THEN
??????ROLLBACK;
??????RAISE;
END;

?-- 方法二：使用 exception

--?利用系統?exception
DECLARE
???pi?????CONSTANT?NUMBER?(9,?7)??:=?3.1415927;
???radius??????????INTEGER?(5);
???area????????????NUMBER?(14,?2);
???some_variable???NUMBER?(14,?2);
BEGIN
???radius?:=?0;

???LOOP
??????BEGIN
?????????radius?:=?radius?+?1;
?????????some_variable?:=?1?/?(radius?-?4);
?????????area?:=?pi?*?POWER?(radius,?2);

?????????INSERT?INTO?areas
??????????????VALUES?(radius,?area);

?????????EXIT?WHEN?area?>?100;
??????EXCEPTION
?????????WHEN?ZERO_DIVIDE
?????????THEN
????????????NULL;
??????END;
???END?LOOP;

???COMMIT;
EXCEPTION
???WHEN?OTHERS
???THEN
??????ROLLBACK;
??????RAISE;
END;

總結

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