Exception dose not working in execute immediate insert in oracle - oracle

Question

I have some problem in execute immediate insert statement exception part.
I have a table query_tb that contains two columns (DEPT and SOURCE_VALUE)
The column contains data in below
CLERK
select a.empno,a.ename,a.job,a.mgr,a.hiredate,b.deptno,b.dname,b.loc
from emp a,dept b where a.deptno=b.deptno and a.empno= '#V_GCIF#'
SALESMAN
select e.empno,e.ename,e.job,d.deptno,d.dname,d.loc from emp e,dept
d where e.deptno=d.deptno and e.empno= '#V_GCIF#'
MANAGER
select a.empno,a.ename,a.job,b.deptno,b.dname,b.loc from employee
a,department b where a.deptno=b.deptno and a.empno= '#V_GCIF#'
ADMIN
select a.empno,a.ename,a.job,b.deptno,b.dname,b.loc from employee
a,department b where a.deptno=b.deptno and a.empno= '#V_GCIF#'
If I pass the correct empno which is keep on the emp table it runs fine. But if I pass the incorrect empno (no data) then exception part not working.
create or replace
PROCEDURE test_emp_sp(
p_id IN VARCHAR2)
AS
CURSOR rec
IS
SELECT dept,
source_value
FROM query_tb;
v_query VARCHAR2(1000);
BEGIN
FOR rec IN
(SELECT dept,source_value FROM query_tb
)
LOOP
IF rec.dept='CLERK' THEN
v_query :=REPLACE(rec.source_value,'#V_GCIF#',p_id);
EXECUTE IMMEDIATE 'INSERT INTO emp_tb (empno,ename,job,mgr,hiredate,deptno,dname,loc) ('||v_query|| ')';
dbms_output.put_line(v_query||' inserted');
ELSE
v_query:=REPLACE(rec.source_value,'#V_GCIF#',p_id);
EXECUTE IMMEDIATE 'INSERT INTO emp_tb (empno,ename,job,deptno,dname,loc) ('||v_query||')';
dbms_output.put_line(v_query||' inserting others');
END IF;
END LOOP;
commit;
EXCEPTION
WHEN others THEN
dbms_output.put_line('No data Found...');
END;

Answer 1

That's because you are not running a select command, it is an insert command (insert select) which means that if the select won't return rows it just doesn't insert anything and no error is thrown for that. You should check whether the insert command has affected any rows. The way you do that in Oracle is checking the SQL%ROWCOUNT immediate after the execution, if it turns to be 0 then you do your job raising an exception. It would be something like:
DECLARE
customException EXCEPTION;
PRAGMA EXCEPTION_INIT( customException, -20001 );
....
BEGIN
EXECUTE IMMEDIATE 'INSERT INTO emp_tb (empno,ename,job,mgr,hiredate,deptno,dname,loc)
('||v_query|| ')';
IF (SQL%ROWCOUNT) = 0 then
raise_application_error( -20001, 'This is a custom error' );
end if;
EXCEPTION
WHEN customException THEN
dbms_output.put_line('No data Found...');
END;
It's a long time without programming in Oracle PLSql So somethings there on the provided code may not compile but it is all there look into it in the internet and you will be good.

Answer 2

Exception does not work because there is no exception.
If SELECT returns NULL then 0 rows will be INSERT.
Example:
insert into t1(c1)
select 100 from dual where 1=0;
Result: 0 rows inserted.

Answer 3

insert into ... select from..
will not raise a no_data_found exception. It will just insert 0 records.
To test if you have inserted any records you can use SQL%ROWCOUNT after the insert statement.
execute immedate 'INSERT...;
if SQL%ROWCOUNT=0
then
dbms_output.put_line('no records inserted');
else
...
end if;
Also you might want to consider changing #V_GCIF# into something that can be used as a bind varaiable such as :P_ID.
You can skip the replace statement and change the execute immediate into something like:
execute immediate 'INSERT INTO ...'||v_query
using p_id;
This will bind the value of p_id to the :p_id in the statement.

Answer 4

The very basic thing here is to capture the error appropriately so that you can able to track back. Here i have put loggers and EXCEPTION handlers jsut to check the error. Also i have put a RAISE_APPLICATION_ERROR. Did some modifications too in the snipet. Hope it helps.
PS: Have not checked for the syntax as i dont have workspace now with me.
CREATE OR REPLACE
PROCEDURE test_emp_sp(
p_id IN VARCHAR2)
AS
--Not needed
-- CURSOR rec
-- IS
-- SELECT dept,
-- source_value
-- FROM query_tb;
--Not needed
v_query VARCHAR2(1000);
BEGIN
FOR rec IN
(SELECT dept,source_value FROM query_tb
)
LOOP
IF rec.dept='CLERK' THEN
v_query :=REPLACE(rec.source_value,'#V_GCIF#',p_id);
BEGIN
EXECUTE IMMEDIATE 'INSERT INTO emp_tb (empno,ename,job,mgr,hiredate,deptno,dname,loc) ('||v_query|| ')';
dbms_output.put_line(v_query||' inserted');
EXCEPTION WHEN OTHERS THEN
dbms_output.put_line(' Error while inserting data in emp_tab for Clerk--> '||SQLCODE||'---'||SQLERRM);
END;
ELSE
v_query:=REPLACE(rec.source_value,'#V_GCIF#',p_id);
BEGIN
EXECUTE IMMEDIATE 'INSERT INTO emp_tb (empno,ename,job,deptno,dname,loc) ('||v_query||')';
dbms_output.put_line(v_query||' inserting others');
EXCEPTION WHEN OTHERS THEN
dbms_output.put_line(' Error while inserting data in emp_tab for other then clerk --> '||SQLCODE||'---'||SQLERRM);
END;
END IF;
END LOOP;
COMMIT;
EXCEPTION
WHEN OTHERS THEN
RAISE_APPLICATION_ERROR(-20001,'Error occurred in the plsql block',TRUE);
END;
/