Hibernate4.3.x Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

          如下错误

                Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set。


                        今天没事看看新的hibernate-core-4.3.10.Final   看来官方文档。

                      

public class Person {

   public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getPassword() { return password; } public void setPassword(int password) { this.password = password; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; }    private Integer id;    private String name;    private int password;    private Date birthday; }



<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- 持久化映射文件(将java对象映射到数据库表) -->
<hibernate-mapping>
   <class name="com.it.hibernate.pojo.Person" table="t_person">
     <id name="id">
        <generator class="native"></generator>
     </id>
     <property name="name" column="t_name" length="12"/>
     <property name="password" length="6"/>
     <property name="birthday" />
   </class> 
</hibernate-mapping>
官方获取sessionfactory
public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            return new Configuration().configure().buildSessionFactory(
			    new StandardServiceRegistryBuilder().build() );
        }
        catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}
hibernate.cfg.xml 如下

<?xml version='1.0' encoding='utf-8'?>
<!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>
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql:///hibernate_db</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">123456</property>
		<!-- 数据库方言 加五提高速度 -->
		<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
		<!-- 展现sql -->
		<property name="show_sql">true</property>
		<!-- 格式化sql -->
		<property name="hibernate.format_sql">true</property>
		<!-- 自动创建sql create 每次执行都都要先删除表再创建表 update 没有就创建表 有就直接插入 -->
		<property name="hibernate.hbm2ddl.auto">update</property>
		<mapping resource="com/it/hibernate/pojo/Person.hbm.xml" />
	</session-factory>

</hibernate-configuration>


测试类

public class PersonTest {
	public static void main(String[] args) {
		  SessionFactory factory =HibernateUtil.getSessionFactory();
		  Session session = factory.openSession();
		  Transaction tx =   session.beginTransaction();
		  Person p = new Person();
		  p.setName("MOMO");
		  p.setPassword(123456);
		  p.setBirthday(new Date());
		  session.save(p);
		  tx.commit();
		  session.close();
	}
 
}
如下错误
Initial SessionFactory creation failed.org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.it.hibernate.utils.HibernateUtil2.buildSessionFactory(HibernateUtil2.java:21)
at com.it.hibernate.utils.HibernateUtil2.<clinit>(HibernateUtil2.java:9)
at com.it.hibernate.pojo.test.PersonTest.main(PersonTest.java:14)
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:104)
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:71)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:209)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
at com.it.hibernate.utils.HibernateUtil2.buildSessionFactory(HibernateUtil2.java:16)
... 2 more
修改获取sessionFactory的公用方法
public class HibernateUtil {


    private static final SessionFactory sessionFactory = buildSessionFactory();


    private static SessionFactory buildSessionFactory() {
        try {
            // 从 hibernate.cfg.xml 创建SessionFactory
        	
        	Configuration cfg = new Configuration().configure();
        	StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
            .applySettings(cfg.getProperties()).build();
            return cfg.buildSessionFactory(
            		serviceRegistry);
        }
        catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }


    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }


}
修改完就可以顺利插入数据。 有个疑问是官方给错了?还是我其他地方有问题有问题呢! 但是我改了sessionfactory获取方式就好了呀!求大神指点。

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            return new Configuration().configure().buildSessionFactory(
			    new StandardServiceRegistryBuilder().build() );
        }
        catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}
posted on 2015-06-24 21:54  未亦末  阅读(260)  评论(0编辑  收藏  举报