Question

预期结果：如何从大学角色打印数据，就像我分享了一个屏幕截图链接

截屏：http://imgur.com/H3wolaB 项目结构：http://imgur.com/IRxGJeq

处理简单登录并显示用户类型数据我在eclipse juno中创建了一个hibernate项目我正在使用2个班级 1）College_UserLogin 2）College_Role

我正在尝试从第二课获取usertype（比如学生）使用共同密钥＆＃39; RoleID＆＃39;在两个班级中提到。但我得到了这个例外，我被困住了，

堆栈跟踪

创建初始SessionFactory failed.org.hibernate.HibernateException：缺少列： college_UserLogin in CERPDevNew.dbo.College_Role

注意： College_UserLogin不是列，而是编译器将其理解为列，这是我的问题

    @Entity

    @Table(name = "College_Role")

    //@Inheritance(strategy = javax.persistence.InheritanceType.TABLE_PER_CLASS)

    //@DiscriminatorValue("College_Role")

    //@PrimaryKeyJoinColumn(name="RoleID")

    public class College_Role implements Serializable {

        private static final long serialVersionUID = 9182318500460817975L;

        @Id

        //@GeneratedValue(strategy=GenerationType.AUTO)

        //@OneToOne(mappedBy="collegeRole")

        //@PrimaryKeyJoinColumn(name="roleID")

        //@JoinColumn(name="roleID",referencedColumnName="roleID", unique= true, nullable=true, updatable = false, insertable = false)

        @JoinColumn(name="roleID",unique= true, nullable=false, insertable=false, updatable=false)

        public College_UserLogin college_UserLogin;

         public College_UserLogin getCollege_UserLogin() {

              return college_UserLogin;

            }

            public void setCollege_UserLogin(College_UserLogin college_UserLogin) {

              this.college_UserLogin = college_UserLogin;

            }



        @Column(name="RoleID")
        private int roleID;

    ://body

    **College_UserLogin.java**


    @Entity

    @Table(name = "College_UserLogin")

    //@Inheritance(strategy = InheritanceType.SINGLE_TABLE)

    //@DiscriminatorColumn(name = "College_UserLogin", discriminatorType = DiscriminatorType.STRING)

    public class College_UserLogin implements Serializable {


        private static final long serialVersionUID = 6304741905092879739L;

        @Id

        //@GeneratedValue(strategy=GenerationType.IDENTITY)

        //@AttributeOverride(name="roleID", column=@Column(name="roleID"))

        // @OneToOne(cascade=CascadeType.ALL, mappedBy="College_UserLogin")

    //  @PrimaryKeyJoinColumn

        //@JoinColumn(name="roleID",referencedColumnName="role_ID", unique= true, nullable=true, updatable = false, insertable = false)


        private College_Role college_Role;

        public College_Role getCollege_Role() {

            return college_Role;

          }


        public void setCollege_Role(College_Role college_Role) {

            this.college_Role = college_Role;

          }


        public College_UserLogin(){

        }
    //body

更新 HibernateUtil类

public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static ServiceRegistry serviceRegistry;
private static Configuration configuration;

**added entity manager factory and entity manager**

static EntityManagerFactory emf = Persistence.createEntityManagerFactory("Rest-WS");
static EntityManager em = emf.createEntityManager();


/* All  SQL, DML entities must be registered */
public static void registerBeans() {
    configuration.addAnnotatedClass(College_UserLogin.class);
    configuration.addAnnotatedClass(College_Role.class);
}

    private static final SessionFactory buildSessionFactory() {
        try {
            configuration = new Configuration();
            configuration.configure();
            registerBeans();

        serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();

        return configuration.buildSessionFactory(serviceRegistry);
    }
    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 void main(String args[]) throws Exception {
    //these line i have added//     em.getTransaction().begin();


      College_UserLogin college_UserLogin = new College_UserLogin();
              em.persist(college_UserLogin);


      College_Role college_Role = new College_Role();
    //  college_Role.setName("dept name");
      college_UserLogin.setCollege_Role(college_Role);


      em.flush();
            //up to here these lines i have added// 

    HibernateUtil.getSessionFactory();

    //Changes i made 
    Configuration cfg=new Configuration();  
        cfg.configure("hibernate.cfg.xml");  

        Session session=sessionFactory.openSession();  

    //   Query query=session.createQuery("select * from College_UserLogin where UserID='ATME.admin'");  
        @SuppressWarnings("unchecked")
        List<College_UserLogin> list= (List<College_UserLogin> )session.createQuery("from College_UserLogin where userid='atme.admin' ").list();


        Iterator<College_UserLogin> itr=list.iterator();  
       // while(itr.hasNext()){  
            //College_UserLogin clg_login = null;
        College_UserLogin clg_login=itr.next();  
         System.out.println(clg_login.getUserID() + itr.next() +" "+ clg_login.getEmailID() + itr.next());  
         College_Role clg_role =clg_login.getCollege_Role();  ;
         System.out.println(" "+  
                 clg_role.getRoleDescription() + itr.next() +" "+clg_role.getSuperiorHeirarchy() + itr.next());   

//these lines i have added//
      System.out.println("success");

    em.getTransaction().commit();
    em.close();
    emf.close();

}

    }

完成堆栈跟踪

Sep 30, 2015 12:28:03 PM org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}

Sep 30, 2015 12:28:03 PM org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core {4.0.0.Final}

Sep 30, 2015 12:28:03 PM org.hibernate.cfg.Environment <clinit>

INFO: HHH000206: hibernate.properties not found

Sep 30, 2015 12:28:03 PM org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist

Sep 30, 2015 12:28:03 PM org.hibernate.cfg.Configuration configure

INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml

Sep 30, 2015 12:28:03 PM org.hibernate.cfg.Configuration 
getConfigurationInputStream

INFO: HHH000040: Configuration resource: /hibernate.cfg.xml

Sep 30, 2015 12:28:04 PM org.hibernate.cfg.Configuration doConfigure

INFO: HHH000041: Configured SessionFactory: null

Sep 30, 2015 12:28:04 PM 

org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderI
mpl configure

INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)

Sep 30, 2015 12:28:04 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000115: Hibernate connection pool size: 100

Sep 30, 2015 12:28:04 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000006: Autocommit mode: true

Sep 30, 2015 12:28:04 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000401: using driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] at 

URL [jdbc:sqlserver://172.18.1.30;Database=CERPDevNew;]
Sep 30, 2015 12:28:04 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000046: Connection properties: {user=Sa, password=****, autocommit=true}

Sep 30, 2015 12:28:04 PM org.hibernate.dialect.Dialect <init>

INFO: HHH000400: Using dialect: org.hibernate.dialect.SQLServer2008Dialect
Sep 30, 2015 12:28:04 PM 
org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService

INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory

Sep 30, 2015 12:28:04 PM 

org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>

INFO: HHH000397: Using ASTQueryTranslatorFactory

Sep 30, 2015 12:28:04 PM org.hibernate.validator.internal.util.Version <clinit>

INFO: HV000001: Hibernate Validator 5.1.2.Final

Sep 30, 2015 12:28:04 PM org.hibernate.tool.hbm2ddl.SchemaValidator validate

INFO: HHH000229: Running schema validator

Sep 30, 2015 12:28:04 PM org.hibernate.tool.hbm2ddl.SchemaValidator validate

INFO: HHH000102: Fetching database metadata

Sep 30, 2015 12:28:04 PM org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000261: Table found: CERPDevNew.dbo.College_Role

Sep 30, 2015 12:28:04 PM org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000037: Columns: [stafftype, isactive, superiorheirarchy, roleid, roledescription]

Initial SessionFactory creation failed.org.hibernate.HibernateException: Missing column: college_UserLogin in CERPDevNew.dbo.College_Role

Exception in thread "main" java.lang.ExceptionInInitializerError

    at com.orcta.dao.HibernateUtil.buildSessionFactory(HibernateUtil.java:40)

    at com.orcta.dao.HibernateUtil.<clinit>(HibernateUtil.java:17)

Caused by: org.hibernate.HibernateException: Missing column: college_UserLogin in CERPDevNew.dbo.College_Role

    at org.hibernate.mapping.Table.validateColumns(Table.java:275)

    at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1268)

    at 

org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:155)

    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:453)

    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737)

    at com.orcta.dao.HibernateUtil.buildSessionFactory(HibernateUtil.java:35)

    ... 1 more

提前致谢。对高级java初学者来说，这将是一个很好的帮助

Answer 1

@PiyushSoni你不能评论@OneToOne和@JoinColumn注释！ Hibernate的原因认为它只是一个列（必须由外键关联）。您必须在College_UserLogin类中添加@OneToOne和@JoinColumn注释，并在College_Role类中添加带有“mappedBy”的@OneToOne。使用此注释，您将在College_UserLogin中将一个外键字段链接到College_Role。

如果您想在College_UserLogin和College_Role中使用外键，您必须在College_UserLogin类中添加@OneToOne和@JoinColumn注释，并在College_Role类中添加@OneToOne和@JoinColumn注释。

我为你准备了一个例子。它使用User class（类似于College_UserLogin）和UserAddress class（类似于College_Role calss）。请参阅有关方法User.getAddress（）和UserAddress.getUser（）的注释。

Answer 2

你不应该使用@JoinColumn注释 @OneToMany（或@OneToOne）。

P.S。您的会话工厂初始化将无法正常用于Hibernate 5.尝试使用fluent-hibernate进行工厂初始化并执行简单请求。一个使用Hibernate和MySQL的简单示例，您可以找到here。随便在GitHub上向我询问有关此库的任何信息。

初始SessionFactory创建failed.org.hibernate.HibernateException：缺少列

2 个答案: