关于使用Hibernate注解的时候遇到的问题

最新推荐文章于 2025-07-28 22:47:47 发布

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本文介绍了一个Hibernate连接异常的问题，配置文件中已正确设置了数据库连接参数和方言等信息，通过更新SessionFactory创建方式解决了“Connection cannot be null when 'hibernate.dialect' not set”的异常。

运行测试代码报错：

Caused by: org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set

我的配置信息

<?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">

<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>

	<session-factory>
		<property name="hbm2ddl.auto">create</property><!--不写的话不会自动生成表 -->
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="connection.url">jdbc:mysql://localhost:3306/Hibernate_Annotation</property>
		<property name="connection.username">root</property>
		<property name="connection.password">root</property>
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="myeclipse.connection.profile">MySqlDriver</property>
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		<property name="hibernate.current_session_context_class">thread</property>
		
		<mapping class="ray.one2one.Woman" />
		<mapping class="ray.one2one.Man" />
	</session-factory>

</hibernate-configuration>

发现配置没有问题，查看帮助文档，发现以前获取sessonFactory的方法已经过时了，推荐了另外一种方法，修改后成功

public class SessionUtil {
	public static Session getSession() {
		Configuration config = new Configuration().configure();
		ServiceRegistry serviceRegistry= new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();  

		SessionFactory sessionFactory = config.buildSessionFactory(serviceRegistry);
		return sessionFactory.openSession();
	}