Creating classes and coding style

Question

Friends I am little confused in how to go about creating classes.I have ideas but not sure which will be better.
I have say 3 oracle tables and I am developing three classes for each table.All the classes will be doing is do the SELECT,DELETE,INSERT,UPDATE operation with the oracle tables.Say for example I have two tables.
DEPT_TABLE
dept_key
dept_desc
tot_emp
EMPLOYEE_TABLE
emp_key
emp_name
dept_key
emp_sal
So I will be developing 2 classes for the 2 table
public class Dept {
private int deptKey = -1;
private int totEmp = -1;
private String deptDesc = "";
public void select(){
//select dept records
public void insert(){
//insert dept records
public void update(){
//update records
public void delete(){
//delete records
similarly a Employee class will be developed.
Now my confusion is does it make sense.
Also is it a nice idea to have dept object as one of field in the employee class instead of the depKey ,because dept key is one of the field in employee table.I mean
public class Employee {
private int empKey = -1;
private int empSal = -1;
private String empName = "";
private Dept dept = null;
public void select(){
//select emp records
public void insert(){
//insert emp records
public void update(){
//update emp records
public void delete(){
//delete records

Answer 1

well, I wouldn't bother if you're on a small project, but, if you find yourself needing to do some thing like this a lot, there are programs that can generate a java class where each property corresponds to a column on some DB table, e.g.:
public class Employee {
  Integer id;
  String name;
}corresponds to table 'Employee' with int column 'id' and varchar column 'name'. They can be handy because you don't have to do pure SQL any more and nearly all of the JDBC logic is handled by the framework (e.g. I would find an employee with a given ID by creating an instance of the Employee class and invoking setId(4)). But, I wouldn't bother with the over-head involved with setting it up for a small project. However, if you find yourself doing this often, it might be some thing worth considering... take care.