Adding mysql user to database -

is possible add mysql user database column?

lets have following table:

create table message(    id int auto_increment not null,    title varchar(255),    message text,    last_edited timestamp default current_timestamp on update current_timestamp,    primary key (id) ) engine=innodb; 

and want add 'editor' column current mysql user , insert there , updates automatically similar behaviour of timestamp datatype. can done , if sort of datatype should use (is there such type user or should use simple varchar) , kind of syntax involved?

create table message(    id int auto_increment not null,    title varchar(255),    message text,    last_edited timestamp default current_timestamp on update current_timestamp,    editor varchar(50) not null,    primary key (id),    unique index `editor`(`editor`) ) engine=innodb; 

and while inserting; use

insert `message`(`columns..`, `editor`)     values( <your values>, current_user() ) on duplicate key update     `editor` = current_user();