Oracle/PLSQL: WHEN OTHERS Clause

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What is a WHEN OTHERS clause?

The WHEN OTHERS clause is used to trap all remaining exceptions that have not been handled by your Named System Exceptions and Named Programmer-Defined Exceptions.
The syntax for the WHEN OTHERS clause in a procedure is:

CREATE [OR REPLACE] PROCEDURE procedure_name
    [ (parameter [,parameter]) ]
IS
    [declaration_section]
BEGIN
    executable_section
EXCEPTION
    WHEN exception_name1 THEN
        [statements]
    WHEN exception_name2 THEN
        [statements]
    WHEN exception_name_n THEN
        [statements]
    WHEN OTHERS THEN
        [statements]
END [procedure_name];

The syntax for the WHEN OTHERS clause in a function is:

CREATE [OR REPLACE] FUNCTION function_name
    [ (parameter [,parameter]) ]
    RETURN return_datatype
IS | AS
    [declaration_section]
BEGIN
    executable_section
EXCEPTION
    WHEN exception_name1 THEN
        [statements]
    WHEN exception_name2 THEN
        [statements]
    WHEN exception_name_n THEN
        [statements]
    WHEN OTHERS THEN
        [statements]
END [function_name];

Here is an example of a procedure that uses a WHEN OTHERS clause:

CREATE OR REPLACE PROCEDURE add_new_order
    (order_id_in IN NUMBER, sales_in IN NUMBER)
IS
    no_sales EXCEPTION;
BEGIN
    IF sales_in = 0 THEN
        RAISE no_sales;
ELSE
    INSERT INTO orders (order_id, total_sales )
    VALUES ( order_id_in, sales_in );
END IF;
EXCEPTION
     WHEN DUP_VAL_ON_INDEX THEN
        raise_application_error (-20001,'You have tried to insert a duplicate order_id.');
    WHEN no_sales THEN
        raise_application_error (-20001,'You must have sales in order to submit the order.');
    WHEN OTHERS THEN
        raise_application_error (-20002,'An error has occurred inserting an order.');
END;

In this example, if an exception is encountered that is not a DUP_VAL_ON_INDEX or a no_sales, it will be trapped by the WHEN OTHERS clause.

Frequently Asked Questions

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Question: Is there any way to get the ORA error number (and/or description) for the errors that will fall into OTHERS?
Something like:

WHEN OTHERS THEN
'Error number ' & Err.Number& ' has happen.'

Answer: Yes, you can use SQLCODE function to retrieve the error number and SQLERRM function to retrieve the error message.
For example, you could raise the error as follows:

EXCEPTION
   WHEN OTHERS THEN
      raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM);
END;

Or you could log the error to a table as follows:

EXCEPTION
   WHEN OTHERS THEN
      err_code := SQLCODE;
      err_msg := substr(SQLERRM, 1, 200);
      INSERT INTO audit_table (error_number, error_message)
      VALUES (err_code, err_msg);
END;