[web] using current_user [mysql]

create table CATEGORY (
     CATEGORY_ID          tinyint                        not null auto_increment,
     CATEGORY_NAME        char(100)                      null,
     ADDED_ON             timestamp                      null,
     ADDED_BY             char(20)                       null,
     LAST_EDITED_ON       timestamp                      not null default current_timestamp on update current_timestamp,
     LAST_EDITED_BY       char(20)                       not null default current_user,
	 
     constraint PK_CATEGORY primary key (CATEGORY_ID)
);