import  java.sql.Connection;
 import  java.sql.DriverManager;
 import  java.sql.ResultSet;
 import  java.sql.Statement;
//import java.util.Properties;

 public   class  JayBirdTest {
     public   static   void  main(String[] args) {
         try  {
               Class .forName("org.firebirdsql.jdbc.FBDriver");
              System.out.println("OK");
// Параметры соединения с базой
            //Properties connInfo = new Properties();
// Кодировка Cp866
            //connInfo.put("charSet", "Cp1251");
            //connInfo.put("CODEPAGEID", "C9");
// Устанавливаем соединение
           Connection con = DriverManager.getConnection("jdbc:firebirdsql:имя_сервера/3050:x:/путь_к_базе/имя_базы.gdb",
                    "sysdba", "masterkey");
            Statement st = con.createStatement();
            ResultSet rs = st.executeQuery("select * from имя_таблицы");
               while  (rs.next()) {
                  try  {
                    System.out.println(rs.getString("ИМЯ_СТОЛБЦА_1"));
                    System.out.println(rs.getString("ИМЯ_СТОЛБЦА_2"));
                }  catch  (Exception ex) {
                    System.out.println("Ошибки: " + ex);
                }
            }
            rs.close();
            st.close();
            con.close();
        }  catch  (ClassNotFoundException e) {
            System.out.println("problem with loading JayBird Driver\n" + e.getMessage());
            System.out.println(e, "load");
        }  catch  (Exception e) {
            System.out.println("problem with connecting to db\n" + e.getMessage());
            System.out.println(e, "connect");
        }
    }
}