ORA-04079: geçersiz tetik şartname

Question

create or replace trigger fineCalc 
AFTER UPDATE ON book_issue 
for each row 
when ((new.date_of_return-old.date_of_issue)>7) 
declare 
    rcpt_no number; 
    s_id char(10); 
begin 
    if :old.card_id in (select card_id from STUDENT_BOOK_ISSUE) 
    then 
    select max(receipt_no) into rcpt_no from fine; 
    select student_id into s_id from STUDENT_BOOK_ISSUE sbi where sbi.card_id=:old.card_id; 

    insert into fine values(rcpt_no+1,((:NEW.date_of_return-:OLD.date_of_issue-7)*5),s_id); 
    end if; 
end; 

Bu ORA-04079 alır: Apex SQL Atölyesi'nde geçersiz tetik şartname:

bunu nasıl düzeltebilirim?

Answer 1

Alex'in önerdiği gibi, dışarıda if koşulunu taşıyıp tekrar deneyin.

create or replace trigger fineCalc 
AFTER UPDATE ON book_issue 
for each row 
when ((new.date_of_return-old.date_of_issue)>7) 
declare 
    rcpt_no number; 
    s_id char(10); 
    v_count number; 
begin 
    select count(*) into v_count from STUDENT_BOOK_ISSUE where card_id=:old.card_id; 
    if v_count > 0 
    then 
    select max(receipt_no) into rcpt_no from fine; 
    select student_id into s_id from STUDENT_BOOK_ISSUE sbi where sbi.card_id=:old.card_id; 
    insert into fine values(rcpt_no+1,((:NEW.date_of_return-:OLD.date_of_issue-7)*5),s_id); 
    end if; 
end;