java - 线程 "main"中的异常 org.hibernate.MappingException : Unknown entity: from Destination

Question

我正在学习 hibernate ，我不明白为什么会弹出这个错误。我尝试搜索，但找不到对我有帮助的解决方案。我想了解为什么会出现此错误。

线程“main”中的异常 org.hibernate.MappingException:未知实体:来自目标

这里有一些细节:

main():

    public static void main(String[] args) {
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();

//      Destination destination = new Destination();
//      destination.setName("IDelhi");
//      destination.setLatitude(1.0f);
//      destination.setLongitude(123.0f);
//      session.save(destination);

        List result = session.createCriteria("from Destination").list();

        session.getTransaction().commit();

        session.close();

//      for (Object dest : result) {
//          Destination d = (Destination)dest;
//          System.out.println(d.getId() + ": "+ d.getName());
//      }
    }
}

当我尝试插入目标(注释代码)时，值被插入到数据库中。

配置:

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 name="">
  <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
  <property name="hibernate.connection.password">*****</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/</property>
  <property name="hibernate.connection.username">*****</property>
  <property name="hibernate.default_schema">wah_schema</property>
  <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
  <!-- Echo all executed SQL to stdout -->
  <property name="show_sql">true</property>
  <!-- Enable Hibernate's automatic session context management -->
  <property name="current_session_context_class">thread</property>
  <mapping class="org.wah.dao.Destination" resource="org/wah/dao/Destination.hbm.xml"/>
 </session-factory>
</hibernate-configuration>

目的地.hbm.xml:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Jan 25, 2012 3:31:00 PM by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
 <class name="org.wah.dao.Destination" table="DESTINATION">
  <id name="id" type="int">
   <column name="ID"/>
   <generator class="identity"/>
  </id>
  <property generated="never" lazy="false" name="name" type="java.lang.String">
   <column name="NAME"/>
  </property>
  <property generated="never" lazy="false" name="latitude" type="float">
   <column name="LATITUDE"/>
  </property>
  <property generated="never" lazy="false" name="longitude" type="float">
   <column name="LONGITUDE"/>
  </property>
 </class>
</hibernate-mapping>

谁能帮我解决这个问题？

Answer 1

使用 session.createCriteria(Destination.class); 您正在尝试使用 HQL - Hibernate Query Language 您需要使用其他 api，例如

Query query = session.createQuery("from Destination");
List list = query.list();