Hibernate 项目查询数据报 UnknownEntityTypeException

朴灿烈づ我的快乐病毒、 2023-06-01 12:55 1阅读 0赞

![1179853-20190806173453389-537182337.png][]

原因分析：

1. hibernate.cfg.xml配置文件有没有映射实体类

2、hibernate 5 创建 Session时，需加上cfg.addClass(\*\*.class);

package com.example;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
    import org.hibernate.cfg.Configuration;
    import org.hibernate.service.ServiceRegistry;
    
    /**
     * @Classname HibernateTest
     * @Description TODO
     * @Date 2019-8-6 15:57
     * @Created by Administrator
     */
    public class HibernateTest {
        public static void main(String[] args) {
            // 1、读取hibernate。cfg.xml配置文件
            Configuration cfg = new Configuration().configure();
            cfg.addClass(Books.class);
            // 2、创建服务注册
            ServiceRegistry registry = new StandardServiceRegistryBuilder()
                    .applySettings(cfg.getProperties())
                    .build();
            // 3、新建SessionFactory对象
            SessionFactory factory = cfg.buildSessionFactory(registry);
            // 4、创建session对象
            Session session = factory.openSession();
            // 5、获取数据
            Books books = (Books) session.get(Books.class,"8");
            System.out.println(books);
            // 6、释放资源
            session.close();
            factory.close();
    
        }
    }

修改完成后可正常运行：

![1179853-20190806174210506-1123767653.png][]

转载于:https://www.cnblogs.com/Anemia-BOY/p/11310621.html

[1179853-20190806173453389-537182337.png]: /images/20230601/0e98eb89b7114a2a9259881233065a09.png
[1179853-20190806174210506-1123767653.png]: /images/20230601/9301e85e664047e39a857400a6a9fac3.png