框架来说主要是需要写大量的配置文件，hibernate相比mybatis来说更强大，移植性更好；
1.类和数据库的映射配置：配置文件命名一般——类名.hbm.xml （user.hbm.xml），与实体类放在同一目录下，配置成员变量和数据库字段的映射：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="ni.jun.yang.bean.User" table="t_user">
<id name="userId" column="userId">
<!-- 主键自动增长 -->
<generator class="native"></generator>
</id>
<property name="userName" column="userName"></property>
<property name="userPsw" column="userPsw"></property>
</class>
</hibernate-mapping>
2.主配置文件，放在src目录下，命名一般用hibernate.cfg.xml：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate1</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">123</property>
<!-- 设置数据库方言 -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 显示sql语句 -->
<property name="hibernate.show_sql">true</property>
<!-- 事务隔离级别：
1.读未提交 1
2.读已提交 2
3.可重复读 4
4.串行化（不可以并发）8
-->
<property name="connection.isolation">2</property>
<property name="hibernate.format_sql">true</property>
<!-- 表自动生成 ：
update没有就建表，有表没影响保留原来的数据，
create每次都会建表，会删除以前的数据，
create-drop，服务器关闭删除表-->
<property name="hibernate.hbm2ddl.auto">update</property> <!-- 二级缓存配置 -->
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property> <!-- 连接池 C3P0配置 -->
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.timeout">120</property>
<property name="automaticTestTable">Test</property>
<property name="hibernate.c3p0.max_statements">100</property>
<property name="hibernate.c3p0.idle_test_period">120</property>
<property name="hibernate.c3p0.acquire_increment">1</property>
<property name="c3p0.testConnectionOnCheckout">true</property>
<property name="c3p0.idleConnectionTestPeriod">18000</property>
<property name="c3p0.maxIdleTime">25000</property>
<property name="c3p0.idle_test_period">120</property> <!-- 映射类配置文件 -->
<mapping resource="ni/jun/yang/bean/user.hbm.xml"></mapping>
<mapping resource="ni/jun/yang/bean/Orders.hbm.xml"></mapping>
<mapping resource="ni/jun/yang/bean/Address.hbm.xml"></mapping>
<mapping resource="ni/jun/yang/bean/Customer.hbm.xml"></mapping>
<class-cache usage="read-write" class="ni.jun.yang.bean.User"/>
</session-factory>
</hibernate-configuration>
3.工具类读取配置文件，获取SessionFactory对象：
package ni.jun.yang.util; import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration; public class HibernateUtil {
private static SessionFactory sessionFactory; public HibernateUtil() { }
public static SessionFactory getSessionFactory(){
if(sessionFactory == null){
Configuration cfg =new Configuration();
cfg.configure();//读取配置文件
sessionFactory = cfg.buildSessionFactory();
}
return sessionFactory;
} }
4.session类中提供了一系列的crud操作：
4.1 添加：
public void Add(User user) {
Session session = sessionFactory.openSession();
Transaction ts = session.beginTransaction(); //开启事务
session.save(user);
ts.commit(); //提交事务
session.close();
}
4.2 删除：
public void delete(User user) {
Session session = sessionFactory.openSession();
Transaction ts = session.beginTransaction(); //开启事务
session.delete(user);
ts.commit(); //提交事务
session.close();
}
4.3 修改：
public void update(User user) {
Session session = sessionFactory.openSession();
Transaction ts = session.beginTransaction();//开启事务
session.update(user);
ts.commit(); //提交事务
session.close();
}
4.4 查询：
public User select(int id) {
Session session = sessionFactory.openSession();
Transaction ts = session.beginTransaction();
User user = session.get(User.class, id);
user.setUserPsw("321");
ts.commit();
session.close();
return user;
}
4.5 查询所有，结合hql语句
public List<User> selectAll() {
Session session = sessionFactory.openSession();
Transaction ts = session.beginTransaction();
Query<User> q=session.createQuery("from User");
// Query<User> q=session.createQuery("from User where userName =:userName");//占位符
// q.setString("userName", "zhangsan"); //占位符赋值
List<User> lists = q.list();
return lists;
}