Hibernate基本示例不工作

Question

我试图实现一个基本的Hibernate示例，但我无法使其工作。

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class SimpleTest {

    public static void main(String[] args) {

        SessionFactory sessionFactory = new Configuration().
                configure().buildSessionFactory();
        Session session = sessionFactory.getCurrentSession();
        Transaction tx = session.beginTransaction();

        Lecturer lecturer1 = new Lecturer();
        lecturer1.setFirstName("Fatma");
        lecturer1.setLastName("Meawad");

        session.save(lecturer1);
        tx.commit();

        System.out.println
                ("The lecturer " + lecturer1.getFirstName()+ " "
                        + lecturer1.getLastName()+" is successfully added to your database");

    }
}

每次我试着运行它，我都会得到：

html" target="_blank">线程“main”org.hibernate.hibernate.hibernateException：无法在org.hibernate.engine.JDBC.connections.internal.BasicConnectionCreator.createConnection(BasicConnectionCreator.java:77)在org.hibernate.engine.JDBC.connections.internal.driverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:106)在internal.AbstractServiceRegistryImpl.InitializeService（AbstractServiceRegistryImpl.java:206)在org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178)在org.hibernate.engine.JDBC.internal.JDBC.Internal.jdbcServicesImpl.buildJdbcConnectionAccess（在org.hibernate.service.internal.abstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:206)在org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178)在org.hibernate.cfg.comfiguration.buildTypeReStrations(configuration.java:1885)在OnFactory(configuration.java:1928)在simpleTest.main(SimpleTest.java:11)在sun.reflect.nativeMethodAccessorImpl.invoke0（原生方法）在sun.reflect.nativeMethodAccessorImpl.invoke(nativeMethodAccessorImpl.invoke(nativeMethodAccessorImpl.java:62)在

我今天刚开始使用Hibernate，但经过一整天的尝试，我无法获得一个基本的示例（我尝试了其他示例）。我忘了什么？

编辑：My hibernate.cfg.xml

    <?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- ________________ To be Edited _________________ -->

        <property name="connection.url">jdbc:mysql//127.0.0.1:3306/sampledb</property>
        <property name="connection.username">root</property>
        <property name="connection.password">password</property>

        <!-- _____________ End of To be Edited ______________ -->


        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="current_session_context_class">thread</property>


        <!-- _________ Defining the Mapping Files ___________ -->

        <mapping resource="Lecturer.hbm.xml" />

    </session-factory>
</hibernate-configuration>

Answer 1

    <property name="hibernate.hbm2ddl.auto">update</property>

将其添加到hibernate.cfg.xml中，然后再试一次