Question

I want to use Oracle exception to handle errors that might happen in the code below. If a user provides the book ID and/or employee ID that doesn’t exist in the database, NO_DATA_FOUND exception will be raised. Thus, how can I know which statement raises this exception.

CREATE OR REPLACE PROCEDURE TEST_EXCEPTION (     book_id_in IN book.book_id%TYPE,     emp_id_in IN emp.emp_id%TYPE ) IS  v_book_desc book.description%TYPE; v_emp_name emp.emp_name%TYPE;  BEGIN  SELECT description into v_book_desc FROM book WHERE book_id = book_id_in;  ...  SELECT emp_name into v_emp_name FROM emp WHERE emp_id = emp_id_in;  ...  EXCEPTION      WHEN NO_DATA_FOUND THEN          /* Do something */   END TEST_EXCEPTION; 

I appreciate any suggestion or guidance. Thank you.

Answer 1

You can set a variable before the given statements. Like;

CREATE OR REPLACE PROCEDURE TEST_EXCEPTION ( book_id_in IN book.book_id%TYPE, emp_id_in IN emp.emp_id%TYPE ) IS  v_book_desc book.description%TYPE; v_emp_name emp.emp_name%TYPE; statementIndex number(1, 0);  BEGIN  statementIndex := 1; SELECT description into v_book_desc FROM book WHERE book_id = book_id_in;  ...  statementIndex := 2; SELECT emp_name into v_emp_name FROM emp WHERE emp_id = emp_id_in;  ...  EXCEPTION WHEN NO_DATA_FOUND THEN  if statementIndex = 1 then  /* Do something */ else /* Do something */ endif;  END TEST_EXCEPTION;