mysql empty set

[cucucur]

hi! I'm driving crazy!!

I have a java code which runs mysql. I have a huge query, that could return "empty set" if some value is not correct, what I want to do is insert in this value "something", maybe "void" or "0":

My database:

mysql> select * from usuarios;
+-----------+--------+
| usuarioID | codigo |
+-----------+--------+
|         1 |    456 |
|         2 |    789 |
|         3 |    123 |
+-----------+--------+
3 rows in set (0.00 sec)

My "empty" consult:

mysql> SELECT usuarioID FROM usuarios WHERE codigo = 45;
Empty set (0.00 sec)

What I want:

+-----------+
| usuarioID |
+-----------+
|      Void |
+-----------+

Is it possible? thank you!!