exp cjtxx/123456@192.168.80.231/orcl file=d:\cjtxx.dmp owner=cjtxx [tables=tablename]

imp cjttest/123456@192.168.80.231/orcl file=d:\cjtxx.dmp full=y 

insert into bdf2_user_position(id_,position_id_,username_) values(:new.username_,'ptjs',:new.username_);

create or replace trigger test

  after insert on bdf2_user

  for each row

declare

  -- local variables here

begin

  insert into bdf2_user_position(id_,position_id_,username_) values(:new.username_,'ptjs',:new.username_);

end test;