Logging Table in Oracle

In Oracle 12c  you create table:

CREATE TABLE msg_log (
    id            NUMBER
        GENERATED BY DEFAULT ON NULL AS IDENTITY,
    ts            TIMESTAMP WITH LOCAL TIME ZONE,
    schema_name   VARCHAR2(15),
    message       VARCHAR2(250)
);

 Create procedure:

CREATE OR REPLACE PROCEDURE log_message (
    message IN VARCHAR2
) AS
    PRAGMA autonomous_transaction;
    schema_name VARCHAR2(15);
BEGIN
    SELECT
        sys_context('userenv', 'current_schema')
    INTO schema_name
    FROM
        dual;

    INSERT /*+ APPEND */ INTO msg_log (
        ts,
        schema_name,
        message
    ) VALUES (
        SYSDATE,
        schema_name,
        message
    );

    COMMIT;
END log_message;

Test

EXEC log_message('foo');

SELECT
    id,
    TO_CHAR(ts, 'YYYY-MM-DD HH24:MM:SS') AS log_date,
    message
FROM
    msg_log; -- where ts > '17-DEC-20 05.05.52.000000000 PM';

Oracle Stored Procedure

Sample of Oracle stored procedure with in & out params & exceptions.

CREATE OR REPLACE PROCEDURE proc_name (
  p1 IN VARCHAR2, 

  p2 OUT VARCHAR2
) 
AS 
  msg VARCHAR2(30) := 'hello ';
  ex_some_exception EXCEPTION;

BEGIN 

  IF length(p1) < 2 THEN RAISE ex_some_exception;
  END IF;
  p2 := msg || p1;
EXCEPTION 
  WHEN ex_some_exception THEN raise_application_error(-20001, 'name to short');
  WHEN OTHERS THEN raise_application_error(-20002, 'An error was encountered');
END proc_name;
/

Testing in & out params.

SET SERVEROUTPUT ON
 
DECLARE 
  full_hello VARCHAR(50);
BEGIN 
  proc_name('Mike', full_hello);
  DBMS_OUTPUT.put_line(full_hello);
END;
/