Hibernate工具类，实现CURD操作

刚刚学习hibernate，对编写工具类做了一个初步的练习，简化对数据的操作

import java.lang.reflect.Field;import java.util.List;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;/** * hibernate工具类 实现CRUD操作 *  * @author Johnson * @version 1.0 */public class HibernateUtil {private static Configuration configuration;private static SessionFactory sessionFactory;static {configuration = new Configuration();configuration.configure();sessionFactory = configuration.buildSessionFactory();}/** *  * @return SessionFactory */public static SessionFactory getSessionFactory() {return sessionFactory;}/** * 获取线程绑定的Session *  * @return Session */public static Session getSession() {return sessionFactory.getCurrentSession();}/** * 关闭sessionFactory */public static void closeSessionFactory() {sessionFactory.close();}/** * 向数据库添加对象 *  * @param <T> * @param obj *            添加数据库的实体类对象 * @return boolean */public static <T> boolean add(T obj) {Transaction tx = null;Session session = null;boolean flag = false;try {session = getSession();tx = session.beginTransaction();session.save(obj);tx.commit();flag = true;} catch (Exception e) {tx.rollback();flag = false;e.printStackTrace();} finally {// session.close();}return flag;}/** * 根据uid获取数据库中数据 *  * @param <T> * @param uid *            对象uid * @return User */public static <T> T get(int uid, Class<T> cls) {Transaction tx = null;Session session = null;T obj = null;try {session = sessionFactory.openSession();tx = session.beginTransaction();obj = session.get(cls, uid);tx.commit();} catch (Exception e) {tx.rollback();e.printStackTrace();} finally {session.close();}return obj;}/** * 根据uid更新数据库数据 * @param uid  对象uid * @param newObj 新对象 * @param cls 对象class属性 * @return boolean */public static <T> boolean update(int uid, T newObj, Class<T> cls) {Transaction tx = null;Session session = null;boolean flag = false;try {session = getSession();tx = session.beginTransaction();T obj = session.get(cls, uid);// 查询不到的情况if (obj == null) {return flag;}// 返回值的类型与注入类型不一样的情况if (!obj.getClass().equals(newObj.getClass())) {return flag;}HibernateUtil.mergeObject(newObj, obj);session.update(obj);tx.commit();flag = true;} catch (Exception e) {tx.rollback();flag = false;e.printStackTrace();} finally {// session.close();}return flag;}/** * 根据uid删除数据库中对象 *  * @param <T> * @param uid *            删除的对象uid * @return boolean */public static <T> boolean delete(int uid, Class<T> cls) {Transaction tx = null;Session session = null;boolean flag = false;try {session = getSession();tx = session.beginTransaction();T obj = session.get(cls, uid);if (obj == null) {return flag;}session.delete(obj);tx.commit();flag = true;} catch (Exception e) {tx.rollback();flag = false;e.printStackTrace();} finally {// session.close();}return flag;}/** * 得到数据库中所有的T类型的数据 * @param cls T类型的class * @return List<T> */@SuppressWarnings({ "unchecked", "rawtypes" })public static <T> List getAll(Class<T> cls) {Transaction tx = null;Session session = null;List<T> list = null;try {session = sessionFactory.openSession();tx = session.beginTransaction();list = session.createQuery("from " + cls.getName()).list();tx.commit();} catch (Exception e) {tx.rollback();e.printStackTrace();} finally {session.close();}return list;}}


/** * 将origin的所有属性注入destination * @param origin 源对象 * @param destination 目标对象 * @return void */public static <T> void mergeObject(T origin, T destination) {if (origin == null || destination == null)return;if (!origin.getClass().equals(destination.getClass()))return;Field[] fields = origin.getClass().getDeclaredFields();for (int i = 0; i < fields.length; i++) {try {fields[i].setAccessible(true);Object value = fields[i].get(origin);if (null != value) {fields[i].set(destination, value);}fields[i].setAccessible(false);} catch (Exception e) {}}}


不足之处，多多指教