IMPACT OF CHANGING REFERENCED OBJECT ON PROCEDURE
If we add any column to the table which is used in a stored procedure then the procedure gets invalidated. But Oracle automatically compiled the invalid object when it is called for execution.
CREATE OR REPLACE PROCEDURE GET_EMP_DATA_PROC(P_EMPLOYEE_ID NUMBER,
P_EMP_DETAILS OUT VARCHAR2)
IS
V_EMP_NAME VARCHAR2(100);
BEGIN
SELECT FIRST_NAME||' '||LAST_NAME
INTO V_EMP_NAME
FROM EMPLOYEES_COPY
WHERE EMPLOYEE_ID = P_EMPLOYEE_ID;
--
P_EMP_DETAILS := V_EMP_NAME;
EXCEPTION
WHEN OTHERS THEN
V_EMP_NAME := 'EMPLOYEE DOES NOT EXISTS';
P_EMP_DETAILS := V_EMP_NAME;
END;
/
SELECT *
FROM USER_OBJECTS
WHERE OBJECT_NAME IN ('EMPLOYEES_COPY', 'GET_EMP_DATA_PROC'); ALTER TABLE EMPLOYEES_COPY ADD (FULL_NAME VARCHAR2(100));
SELECT *
FROM USER_OBJECTS
WHERE OBJECT_NAME IN ('EMPLOYEES_COPY', 'GET_EMP_DATA_PROC'); Calling the procedure GET_EMP_DATA_PROC.
SET SERVEROUTPUT ON;
DECLARE
V_EMP_DETAILS VARCHAR2(100);
BEGIN
GET_EMP_DATA_PROC(100, V_EMP_DETAILS);
DBMS_OUTPUT.PUT_LINE('EMPLOYEE NAME -> '||V_EMP_DETAILS);
END;
/ Now if we check the status of the procedure then it will show VALID.
SELECT *
FROM USER_OBJECTS
WHERE OBJECT_NAME IN ('EMPLOYEES_COPY', 'GET_EMP_DATA_PROC'); ALTER TABLE EMPLOYEES_COPY MODIFY (LAST_NAME VARCHAR2(130));
SELECT *
FROM USER_OBJECTS
WHERE OBJECT_NAME IN ('EMPLOYEES_COPY', 'GET_EMP_DATA_PROC'); SET SERVEROUTPUT ON;
DECLARE
V_EMP_DETAILS VARCHAR2(100);
BEGIN
GET_EMP_DATA_PROC(100, V_EMP_DETAILS);
DBMS_OUTPUT.PUT_LINE('EMPLOYEE NAME -> '||V_EMP_DETAILS);
END;
/ SELECT *
FROM USER_OBJECTS
WHERE OBJECT_NAME IN ('EMPLOYEES_COPY', 'GET_EMP_DATA_PROC'); So we can conclude that any change in referenced table will make the stored procedure as invalid. But once try to we execute the procedure it will automatically be compiled by Oracle.
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