package com.hunqing.user.service;
import com.hunqing.user.entity.User;
/**
* 用户操作接口
*
* @author
*
* <p>Modification History:</p>
* <p>Date Author Description</p>
* <p>------------------------------------------------------------------</p>
* <p> </p>
* <p> </p>
*/
public
interface IUserService {
/**
* Save.
*
* @param user the user
*/
public void save(User user);
/**
* Delete.
*
* @param String userName
*/
public void delete(String userName);
/**
* Update.
*
* @param user the user
*/
public void update(User user);
/**
* Find.
*
* @param user the user
*/
public User find(String userName);
}package com.hunqing.user.service;
import
javax.persistence.EntityManager;
import
javax.persistence.PersistenceContext;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.hunqing.user.entity.User;
@Service @Transactional
public class UserService implements IUserService {
@PersistenceContext
EntityManager em;
public void delete(String userName) { //throws XXX //抛出的例外叫用户例外，客户端捕获
//运行期的异常叫运行期例外 spring会捕获运行期例外，自动回滚事物
//客户例外不会回滚事物
em.remove(em.getReference(User.class, userName));
}
public User find(String userName) {
return em.find(User.class,userName);
}
public void save(User user) {
em.persist(user);
}
public void update(User user) {
em.merge(user);
}
}
摘自 xpp02
