java - hibernate :未设置方言。设置属性 hibernate.dialect

Question

我有以下 hibernate.cfg.xml:

<hibernate-configuration>
   <session-factory>
      <property name="hibernate.format_sql">true</property>
      <property name="hibernate.show_sql">true</property>
      <property name="hibernate.connection.url">jdbc:mysql://localhost/EJB</property>
      <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="hibernate.connection.username">root</property>
      <property name="hibernate.connection.password">password</property>
      <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
      <property name="hibernate.hbm2ddl.auto">update</property>
      <property name="hibernate.current_session_context_class">org.hibernate.context.ThreadLocalSessionContext</property>
 <!-- Snip -->

我使用这条线消费:

sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();

然后，我在其他地方尝试这样做:

SimpleSelect pkSelect = new SimpleSelect(Dialect.getDialect());

这会导致以下异常:

org.hibernate.HibernateException: The dialect was not set. Set the property hibernate.dialect.

注意，日志中的以下摘录:

02:26:48,714  INFO Configuration:1426 - configuring from resource: /hibernate.cfg.xml
02:26:48,717  INFO Configuration:1403 - Configuration resource: /hibernate.cfg.xml
02:26:48,909 DEBUG Configuration:1387 - hibernate.dialect=org.hibernate.dialect.MySQLDialect

知道我做错了什么吗？

Answer 1

getDialect() 的 javadoc 说:

Get an instance of the dialect specified by the current System properties.

因此，您必须在 hibernate.properties 中配置 hibernate.dialect 才能使用此方法。

使用 SessionFactoryImplementor#getDialect()。