An example is given below to instruct the control in PL/SQL program to go to specific line number on some condition.
Suppose you want to by pass the control to any particular line on exception when no_data_found occurs, to achieve this you have to give a label using <<anylabel>> to that particular line to point it at the time of requirement.
The following is an anonymous PL/SQL block demonstrating this scenario using <<Labels>> with GoTo Label statement:
SET SERVEROUTPUT ON;
DECLARE
v NUMBER;
BEGIN
BEGIN
SELECT 1
INTO v
FROM DUAL
WHERE dummy = 'V';
-- change dummy = 'X' to skip exception section
EXCEPTION
WHEN NO_DATA_FOUND
THEN
DBMS_OUTPUT.put_line ('NO_Data_Found occured.');
GOTO mylabel;
END;
-- below code before <<mylabel>> would not be executed if an error occured above
-- because in exception section above, it is sending control directly to label <<mylabel>>
-- but if no error occurred above then the whole program would be executed
v := v + 1;
DBMS_OUTPUT.put_line ('The value of variable v is '||v);
<<mylabel>>
DBMS_OUTPUT.put_line ('After label processing starts.');
-- do some task here
END;
/
