G-1040
🆓Warning
Avoid dead code.
Reason
Any part of your code, which is no longer used or cannot be reached, should be eliminated from your programs to simplify the code.
Example
Non-Compliant Example
declare
co_dept_purchasing constant departments.department_id%type := 30;
begin
if 2 = 3 then -- dead code detection works with literals only
null; -- some dead code here
end if;
null; -- some enabled code here
<<my_loop>>
loop
exit my_loop when true;
null; -- some dead code here
end loop my_loop;
null; -- some other enabled code here
case
when 1 = 1 and 'x' = 'y' then -- dead code detection works with literals only
null; -- some dead code here
else
null; -- some further enabled code here
end case;
<<my_loop2>>
for r_emp in (
select last_name, first_name
from employees
where department_id = co_dept_purchasing
or commission_pct is not null
and 5 = 6 -- dead code detection works with literals only
)
-- "or commission_pct is not null" is dead code
loop
sys.dbms_output.put_line(r_emp.last_name);
continue when true;
sys.dbms_output.put_line(r_emp.first_name); -- dead code
end loop my_loop2;
return;
null; -- some dead code here
end;
/ | Line | Column | Message |
|---|---|---|
| 4 | 7 | Dead code. |
| 12 | 25 | Dead code. |
| 19 | 22 | Dead code. |
| 31 | 14 | Dead code. |
| 36 | 21 | Dead code. |
| 40 | 4 | Dead code. |
Compliant Solution - ★★★★★
declare
co_dept_purchasing constant departments.department_id%type := 30;
begin
null; -- some enabled code here
null; -- some other enabled code here
null; -- some further enabled code here
<<my_loop2>>
for r_emp in (
select last_name
from employees
where department_id = co_dept_purchasing
or commission_pct is not null
)
loop
sys.dbms_output.put_line(r_emp.last_name);
end loop my_loop2;
end;
/ References
- similar to plsql:DeadCodeCheck
The scope of plsql:DeadCodeCheck is EXIT, CONTINUE, RETURN, RAISE, RAISE_APPLICATION_ERROR only.
- same as Trivadis G-1040
- similar to plsqlopen:DeadCode
The scope of plsqlopen:DeadCode is EXIT, CONTINUE, RETURN, RAISE, RAISE_APPLICATION_ERROR only.