Question

我正在使用netbeans 6.9和Hibernate而我正在尝试在数据库中插入一些值（postgres）但是我得到以下异常：

INFO: Not binding factory to JNDI, no JNDI name configured
Exception in thread "main" org.hibernate.MappingException: Unknown entity: SELECTPACK.beanClass
        at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
        at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
        at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:98)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
        at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:3

和我的hbm.xml文件在下面给出

<class name="SELECTPACK.beanClass" table="login">
  <id column="id" name="id">
      <generator class="increment"/>
  </id>
  <property name="username" column="username"/>
  <property name="password" column="password"/>
</class>

我的cfg.xml文件在下面给出

<?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>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
        <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
        <property name="hibernate.connection.url">jdbc:postgresql://192.168.1.100:54321/postgres</property>
        <property name="hibernate.connection.username">postgres</property>
        <property name="hibernate.connection.password">dbserver</property>
        <property name="hibernate.show_sql">true</property>
        <mapping resource="SELECTPACK/select.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

我的pojo课程

package SELECTPACK;

public class beanClass {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

听到的是我的主要课程

package SELECTPACK;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class selectMainClass {

    public static void main(String... args) {
        SessionFactory sessionFact = new Configuration().configure().buildSessionFactory();
        Session ses = sessionFact.openSession();
        Transaction tx = ses.beginTransaction();
        beanClass bean = new beanClass();
        bean.setPassword("hi....");
        bean.setUsername("hi....");
        ses.save(bean);
        tx.commit();
        /*String query = "select * from login";
        Query qry = ses.createQuery(query);
        ArrayList list = (ArrayList) qry.list();
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }*/
        ses.close();
    }
}

我不明白问题是什么。

Answer 1

实体SELECTPACK.beanClass未被识别为有效实体，并且日志中应存在先前的堆栈跟踪（创建SessionFactory时），显示实际错误。寻找先前的痕迹。但可能的原因包括：

表格不存在
其中一个映射列不存在

除此之外，我还有一些小的评论（不是问题）：

传统上，包是小写的（即selectpack）;
Java类名称应以大写字母开头（即BeanClass）;
建议在selectpack.BeanClass映射文件中映射类selectpack/BeanClass.hbm.xml（以便于维护）;
我的建议是在映射文件中使用native生成器。

这个类似的东西：

package selectpack;

public class BeanClass {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

对于映射文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="selectpack.BeanClass" table="login">
      <id column="id" name="id">
          <generator class="native"/>
      </id>
      <property name="username" column="username"/>
      <property name="password" column="password"/>
    </class>
</hibernate-mapping>

当然，请相应地更新hibernate.cfg.xml：

   <mapping resource="selectpack/BeanClass.hbm.xml"/>

但正如我所说，这些言论与问题没有直接关系。

insert语句在hibernate中不起作用

1 个答案: