session.save不保存到數據庫中

Question

下面是JUnit的代碼：

package com.learn.hibernate.entities; 

import java.util.Date; 

import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.Configuration; 
import org.hibernate.service.ServiceRegistry; 
import org.hibernate.service.ServiceRegistryBuilder; 
import org.junit.After; 
import org.junit.Before; 
import org.junit.Test; 

public class HibernateTest { 

    private SessionFactory sessionFactory; 
    private Session session; 
    private Transaction transaction; 

    @Before 
    public void init() { 
     System.out.println("before"); 
     Configuration configuration = new Configuration().configure(); 
     ServiceRegistry serviceRegistry = 
       new ServiceRegistryBuilder().applySettings(configuration.getProperties()) 
              .buildServiceRegistry(); 
     sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
     session = sessionFactory.openSession(); 
     transaction = session.beginTransaction(); 
    } 

    @After 
    public void destory() { 
     System.out.println("after"); 
     transaction.commit(); 
     session.close(); 
     sessionFactory.close(); 
    } 

    @Test 
    public void testSessionFlush() { 
     News news = new News("Java2", "Sun2", new Date()); 
     session.save(news); 
     System.out.println("end"); 
    } 
} 

下面是結果：

Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar 
before 
September 26, 2015 8:10:08 Afternoon org.hibernate.annotations.common.Version <clinit> 
INFO: HCANN000001: Hibernate Commons Annotations {4.0.2.Final} 
September 26, 2015 8:10:08 Afternoon org.hibernate.Version logVersion 
INFO: HHH000412: Hibernate Core {4.2.4.Final} 
September 26, 2015 8:10:08 Afternoon org.hibernate.cfg.Environment <clinit> 
INFO: HHH000206: hibernate.properties not found 
September 26, 2015 8:10:08 Afternoon org.hibernate.cfg.Environment buildBytecodeProvider 
INFO: HHH000021: Bytecode provider name : javassist 
September 26, 2015 8:10:08 Afternoon org.hibernate.cfg.Configuration configure 
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml 
September 26, 2015 8:10:08 Afternoon org.hibernate.cfg.Configuration getConfigurationInputStream 
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml 
September 26, 2015 8:10:08 Afternoon org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity 
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide! 
September 26, 2015 8:10:08 Afternoon org.hibernate.cfg.Configuration addResource 
INFO: HHH000221: Reading mappings from resource: com/learn/hibernate/entities/News.hbm.xml 
September 26, 2015 8:10:08 Afternoon org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity 
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide! 
September 26, 2015 8:10:08 Afternoon org.hibernate.cfg.Configuration doConfigure 
INFO: HHH000041: Configured SessionFactory: null 
September 26, 2015 8:10:08 Afternoon org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!) 
September 26, 2015 8:10:08 Afternoon org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
INFO: HHH000115: Hibernate connection pool size: 20 
September 26, 2015 8:10:08 Afternoon org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
INFO: HHH000006: Autocommit mode: false 
September 26, 2015 8:10:08 Afternoon org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql:///hibernate5] 
September 26, 2015 8:10:08 Afternoon org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
INFO: HHH000046: Connection properties: {user=root, password=****} 
September 26, 2015 8:10:09 Afternoon org.hibernate.dialect.Dialect <init> 
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect 
September 26, 2015 8:10:09 Afternoon org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation 
INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4 
September 26, 2015 8:10:09 Afternoon org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService 
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions) 
September 26, 2015 8:10:09 Afternoon org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init> 
INFO: HHH000397: Using ASTQueryTranslatorFactory 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.SchemaUpdate execute 
INFO: HHH000228: Running hbm2ddl schema update 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.SchemaUpdate execute 
INFO: HHH000102: Fetching database metadata 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.SchemaUpdate execute 
INFO: HHH000396: Updating schema 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.TableMetadata <init> 
INFO: HHH000261: Table found: hibernate5.NEWS 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.TableMetadata <init> 
INFO: HHH000037: Columns: [date, author, id, title] 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.TableMetadata <init> 
INFO: HHH000108: Foreign keys: [] 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.TableMetadata <init> 
INFO: HHH000126: Indexes: [primary] 
September 26, 2015 8:10:09 Afternoon org.hibernate.tool.hbm2ddl.SchemaUpdate execute 
INFO: HHH000232: Schema update complete 
after 

正如你可以看到，儘管我要求輸出end後save()，結果沒有包含它。數據庫沒有改變，爲什麼？

Answer 1

請嘗試以下操作：

@Test 
public void test() { 
    Configuration configuration = new Configuration().configure(); 
    ServiceRegistry serviceRegistry = 
      new ServiceRegistryBuilder().applySettings(configuration.getProperties()) 
             .buildServiceRegistry(); 
    SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
    Session session = sessionFactory.openSession(); 
    Transaction transaction = session.beginTransaction(); 
    try { 
     System.out.println("before"); 
     News news = new News("Java2", "Sun2", new Date()); 
     session.save(news); 
     System.out.println("after"); 
    } catch (HibernateException e) { 
     transaction.rollback(); 
     e.printStackTrace(); 
    } finally { 
     System.out.println("end"); 
     transaction.commit(); 
     session.close(); 
     sessionFactory.close(); 
    } 
}