field of type oid

Hi ,

I have 2 tables in my postgres DB .
2 tables have a field "my_image" of type "oid" ( Blob) .

I have to
1.get a row from table A
2.insert it in table B
3.delete that from table A .

Can I do like this ?
ResultSet rs ;
PreparedStatement pstmt;
String qry2 = "SELECT * FROM A";
String qry = "INSERT INTO B (my_image) VALUES(?)";

/*This part is doubtful to me */
pstmt.setInt(rs.getInt("my_image"));

I am using rs.getInt() because I need only oid . It is working fine
when I tested this code.
I am able to insert integer in to field of type oid . I can retrieve
image(Blob object) from table B using that inserted integer.

However I don't know how much correct this way is . Please advice me.
Thanks in advance.

Regards,
Ravi