oracle函数错误

oracle函数错误:

CREATE OR REPLACE FUNCTION CalWorkingDays
(
StartDate in date,
EndDate in date,
TotalDays in integer
)
RETURN integer IS
v_id int;
FreeDays integer;
DaoJiS integer;
BEGIN
if TotalDays <>0 then
v_id:=-1;
dbms_output.put_line('The value of TotalDays must be up to 0');
exit;
end if;
if TotalDays <FreeDays then
v_id:=-1;
exit;
end if;
if StartDate>EndDate then
v_id:=-1;
exit;
end if;
select count(*) into FreeDays from V_JIEJIARI where jiejiari between StartDate and EndDate;
DaoJiS := TotalDays - FreeDays;
RETURN DaoJiS;
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
WHEN OTHERS THEN
RAISE;
END CalWorkingDays;
/
PLS-00376: 非法 EXIT 语句；它必须出现在一个循环中

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SQL code

Oracle已经提示说了必须存在一个循环中 ...Consult code below:       LOOP          FETCH c1 INTO c1_rec;          EXIT WHEN c1%NOTFOUND;       IF c1_rec.teamcode = tmpstr1 THEN       retVal := 1;          EXIT;       END IF;        END LOOP;
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提示，先把程序的结构写完整了，然后 在加业务逻辑
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不用这么写 ，直接  
 return v_id ；代替exit就可以了  
 exit是用在循环里面的