在Spring框架中集成JPA实例

   package org.shirdrn.entity;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Transient;

@Entity
public class MyUser {

private Long id;
private String userName;
private String password;
private String gender;
private Integer age;
private Integer birthYear;
private String addr;
private String email;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

@Column(name="userName")
public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName;
}

@Column(name="password")
public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

@Column(name="gender")
public String getGender() {
return gender;
}

public void setGender(String gender) {
this.gender = gender;
}

@Column(name="age")
public Integer getAge() {
return age;
}

public void setAge(Integer age) {
this.age = age;
}

@Column(name="addr")
public String getAddr() {
return addr;
}

public void setAddr(String addr) {
this.addr = addr;
}

@Column(name="email")
public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

@Transient
public Integer getBirthYear() {
return new Integer(2008-age);
}

public void setBirthYear(Integer age) {
this.birthYear = new Integer(2008-age);
}
}

   package org.shirdrn.dao;

import java.util.List;

import org.shirdrn.entity.MyUser;
import org.springframework.transaction.annotation.Transactional;

@Transactional
public interface MyUserDAO {
public void createMyUser(MyUser myUser);
public void deleteMyUser(MyUser myUser);
public void updateMyUser(MyUser myUser);
public List queryMyUser(String queryString);
public List queryAll();
}

    package org.shirdrn.dao.impl;

import java.util.List;

import org.shirdrn.dao.MyUserDAO;
import org.shirdrn.entity.MyUser;
import org.springframework.orm.jpa.support.JpaDaoSupport;

public class MyUserDAOImpl extends JpaDaoSupport implements MyUserDAO {

public void createMyUser(MyUser myUser) {
getJpaTemplate().persist(myUser);
}

public void deleteMyUser(MyUser myUser) {
MyUser dbMyUser = getJpaTemplate().find(MyUser.class, myUser.getId());
getJpaTemplate().remove(dbMyUser);
}

public void updateMyUser(MyUser myUser) {
MyUser dbMyUser = getJpaTemplate().find(MyUser.class, myUser.getId());
if(myUser.getUserName() != null){
dbMyUser.setUserName(myUser.getUserName());
}
if(myUser.getAddr() != null){
dbMyUser.setAddr(myUser.getAddr());
}
getJpaTemplate().merge(dbMyUser);
}

@SuppressWarnings("unchecked")
public List queryMyUser(String queryString) {
return (List)getJpaTemplate().find(queryString);
}

@SuppressWarnings("unchecked")
public List queryAll() {
return (List)getJpaTemplate().find("from MyUser");
}
}