How to send arbitrary parameters to Oracle trigger?

Question

The purpose is to send extra information to triggers like current user id from a web application. Since a connection pool is used, and same user id is used for all connectio

Answer 1

you could use Oracle Contexts:

SQL> CREATE OR REPLACE PACKAGE test_pkg AS
  2     PROCEDURE set_context(p_attribute VARCHAR2, p_value VARCHAR2);
  3  END test_pkg;
  4  /

Package created
SQL> CREATE OR REPLACE PACKAGE BODY test_pkg AS
  2     PROCEDURE set_context(p_attribute VARCHAR2, p_value VARCHAR2) IS
  3     BEGIN
  4        dbms_session.set_context('test_ctx', p_attribute, p_value);
  5     END;
  6  END test_pkg;
  7  /

Package body created

SQL> create context test_ctx using test_pkg;

Context created

SQL> exec test_pkg.set_context ('user_id', 'Vincent');

PL/SQL procedure successfully completed

SQL> select sys_context('test_ctx', 'user_id') from dual;

SYS_CONTEXT('TEST_CTX','USER_I
--------------------------------------------------------------------------------
Vincent