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 can use a package to keep track of the web user:

create package web_user_pkg is

    procedure set_username (p_username varchar2);

    function username return varchar2;

end;

create package body web_user_pkg is

    g_username varchar2(30);

    procedure set_username (p_username varchar2)
    is
    begin
        g_username := p_username;
    end;

    function username return varchar2 is
    begin
        return g_username;
    end;

end;

In the web page call web_user_pkg.set_username with the current user's ID before performing any DML or other package calls.

In the trigger use web_user_pkg.username to get the web user name.