sunフォーラムでだまされたjavaのdao例
Here's the model object, with Hibernate annotations so you can generate the mappings an schema:
package
model;
import
javax.persistence.*;
import
java.io.Serializable;
import
java.util.Date;
import
java.util.Calendar;
import
java.util.GregorianCalendar;
/** * Created by IntelliJ IDEA. * User: Michael * Date: Sep 13, 2006 * Time: 5:14:17 PM * To change this template use File | Settings | File Templates. */
@SuppressWarnings({
"JavaDoc"
}
)
@Entity
@Table(name = "students"
)
public
class
Student implements
Serializable
{
private
Long id;
private
String name;
private
Date birthday;
private
Student()
{
this
(null, ""
, new
Date());
}
public
Student(String name, Date birthday)
{
this
(null, name, birthday);
}
public
Student(Long id, String name, Date birthday)
{
this.id = id;
this.name = name;
this.birthday = new
Date(birthday.getTime());
}
@Id
@Column(name = "student_id"
)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "students_student_id_seq"
)
@SequenceGenerator(name = "students_student_id_seq"
, sequenceName = "students_student_id_seq"
)
public
Long getId()
{
return
id;
}
private
void
setId(Long id)
{
this.id = id;
}
@Column(name = "full_name"
, unique = false, nullable = false, length = 32)
public
String getName()
{
return
name;
}
private
void
setName(String name)
{
this.name = name;
}
@Column(name = "birthday"
, unique = false, nullable = false
)
public
Date getBirthday()
{
return
birthday;
}
private
void
setBirthday(Date birthday)
{
this.birthday = birthday;
}
public
int
getAge()
{
int
age = 0;
Calendar calendar = GregorianCalendar.getInstance();
Date today = new
Date();
calendar.setTime(today);
int
currentYear = calendar.get(Calendar.YEAR);
calendar.setTime(birthday);
int
birthYear = calendar.get(Calendar.YEAR);
age = currentYear - birthYear;
return
age;
}
public
boolean
equals(Object o)
{
if
(this
== o)
{
return
true
;
}
if
(o == null
|| getClass() != o.getClass())
{
return
false
;
}
Student student = (Student) o;
if
(id != null
? !id.equals(student.id) : student.id != null
)
{
return
false
;
}
return
true
;
}
public
int
hashCode()
{
return
(id != null
? id.hashCode() : 0);
}
public
String toString()
{
return
"Student{"
+
"id="
+ id +
", name='"
+ name + '\''
+
", birthday="
+ birthday +
'}'
;
}
}
Here's the DAO interface: package
persistence;
public
interface
StudentDao
{
public
Student find(Long id);
public
List<Student> findAll();
public
List<Student> find(String name);
public
void
saveOrUpdate(Student s);
public
void
delete(Long id);
public
void
delete(Student s);
}