Problem With Deserialization in Digital persona Finger Print

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deserialization

try {
String a="1000";
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/fpt", "root", "root");
            String select_blob = "select imag_save.img from imag_save inner join registration_stud on registration_stud.fk_f_name=imag_save.f_name where registration_stud.registration_no='" + a + "'";
          
            ResultSet rs = null;
            java.sql.Statement st = conn.createStatement();
            rs = st.executeQuery(select_blob);
            while (rs.next()) {

                byte[] bytes = rs.getBytes("img");
                System.out.println("bytes" + bytes);
                DPFPTemplate t = DPFPGlobal.getTemplateFactory().createTemplate();
                t.deserialize(bytes);
                setTemplate(t);

            }
        } catch (Exception e) {
            System.out.println("exception" + e.getMessage());
        }

Here I Input A register number to select the BLob data From Database.Then It Works Well.But The problem Is how Can i Search The Blob data without Entering Any Inputs(register number).I mean Only fingerprint data is needed to Login No need of register number...