Question

我试图实现一个基本的Hibernate示例，但我无法让它工作。

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");

    }
}

每当我尝试运行它时，我得到：

线程中的异常＆＃34; main＆＃34; org.hibernate.HibernateException：无法 make JDBC Connection [jdbc：mysql // 127.0.0.1：3306 / sampledb] at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.createConnection（BasicConnectionCreator.java:77）在 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure（DriverManagerConnectionProviderImpl.java:106）在 org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:89）在 org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:206）在 org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178）在 org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess（JdbcServicesImpl.java:260）在 org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure（JdbcServicesImpl.java:94）在 org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:89）在 org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:206）在 org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178）在 org.hibernate.cfg.Configuration.buildTypeRegistrations（Configuration.java:1885）在 org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1843）在 org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1928）在SimpleTest.main（SimpleTest.java:11）at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:483）at com.intellij.rt.execution.application.AppMain.main（AppMain.java:134）

我今天刚开始使用Hibernate，但经过一整天的尝试后，我无法获得一个基本的例子（我尝试了其他例子）。我忘记了什么？

编辑：我的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>

在你的hibernate.cfg.xml中添加它，然后再试一次

Hibernate Basic示例不起作用

1 个答案: