Hibernate_二级缓存1_初步使用

悠悠 2022-06-16 10:22 107阅读 0赞

<property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>
    		
    		<class-cache usage="read-write" class="cn.itcast.l_second_cache.Employee"/>

<!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 name="foo">
    		
    		
    		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    		
    		<property name="connection.url">jdbc:mysql://localhost:3306/hibernate_20170423</property>
    		
    		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    		
    		<property name="connection.username">root</property>
    		
    		<property name="hibernate.connection.password">root</property>
    
    		
    		
    		<property name="hibernate.show_sql">true</property>
    		
    		<property name="hibernate.format_sql">false</property>
    
    		
    		<property name="hbm2ddl.auto">update</property>
    
    		
    		<property name="connection.isolation">2</property>
    		
    		
    		
    		<property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
    		
    		<property name="c3p0.min_size">5</property>
    		
    		<property name="c3p0.max_size">20</property>
    		
    		<property name="c3p0.timeout">120</property>
    		
    		<property name="c3p0.idle_test_period">3000</property>
    		
    		
    		
    		<property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>
    		
    		<class-cache usage="read-write" class="cn.itcast.l_second_cache.Employee"/>
    		
    		
    		
    
    	</session-factory>
    </hibernate-configuration>

package cn.itcast.l_second_cache;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.Transaction;
    import org.hibernate.cfg.Configuration;
    import org.junit.Test;
    
    /**
     * 应用程序操作类
     * 
     * @author 风清杨
     * @version V3.0
     * 
     */
    public class App {
    	private static SessionFactory sessionFactory = new Configuration()//
    			.configure()//
    			.addClass(Department.class)//
    			.addClass(Employee.class)//
    			.buildSessionFactory();
    
    	// 测试一级缓存(一级缓存[在控制台显示2条查询语句])
    	@Test
    	public void testSessionCache() throws Exception {
    		// ====================================第1个Session
    		Session session = sessionFactory.openSession();
    		Transaction tx = null;
    		try {
    			tx = session.beginTransaction();
    			// ------------------------------------
    
    			// 获取一方数据,并显示另一方信息
    			Employee employee = (Employee) session.get(Employee.class, 1);
    			// System.out.println(employee);
    
    			// ------------------------------------
    			tx.commit();
    		} catch (RuntimeException e) {
    			tx.rollback();
    			throw e;
    		} finally {
    			session.close();
    		}
    		// ====================================第二2个Session
    		Session session2 = sessionFactory.openSession();
    		Transaction tx2 = null;
    		try {
    			tx2 = session2.beginTransaction();
    			// ------------------------------------
    
    			// 获取一方数据,并显示另一方信息
    			Employee employee2 = (Employee) session2.get(Employee.class, 1);
    			// System.out.println(employee2);
    
    			// ------------------------------------
    			tx2.commit();
    		} catch (RuntimeException e) {
    			tx2.rollback();
    			throw e;
    		} finally {
    			session2.close();
    		}
    	}
    }