Hibernate4.3.x Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
阿新 • • 發佈：2019-01-08
如下錯誤
Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set。
今天沒事看看新的hibernate-core-4.3.10.Final 看來官方文件。
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"> <!-- 持久化對映檔案（將java物件對映到資料庫表） --> <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>
官方獲取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> <!-- 資料庫方言 加五提高速度 --> <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <!-- 展現sql --> <property name="show_sql">true</property> <!-- 格式化sql --> <property name="hibernate.format_sql">true</property> <!-- 自動建立sql create 每次執行都都要先刪除表再建立表 update 沒有就建立表 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>
測試類
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();
}
}
如下錯誤
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
修改獲取sessionFactory的公用方法
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// 從 hibernate.cfg.xml 建立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;
}
}
修改完就可以順利插入資料。 有個疑問是官方給錯了？還是我其他地方有問題有問題呢！ 但是我改了sessionfactory獲取方式就好了呀！求大神指點。
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;
}
}