ID的Hibernate未知整数数据类型 [英] Hibernate Unknown integral data type for ids

问题描述

我从Hibernate开始，但遇到一个我无法弄清的错误.

I'm starting with Hibernate and I have an error that I just can't figure out.

我有以下课程:

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class AbstractColumn {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private String id;
    private String name;

//Other stuff
}

那我有

@Entity
public class DoubleColumn extends AbstractColumn  implements Column {

    @ElementCollection
    private Map<Double,String> isNA;
    private double min=0;
    private double max=0;
    @ElementCollection
    private List<Double> data;
    // a lot of stuff
}

最后:

@Entity
public class DataFrame {
    @OneToMany(cascade = CascadeType.ALL)
    @PrimaryKeyJoinColumn
    private List<AbstractColumn> data;
    private String name;
    @Id
    @GeneratedValue
    private String id;
    @ElementCollection
    private Map<String,Integer> colIndex;
//more stuff
}

我得到的错误是:

Exception in thread "main" org.hibernate.id.IdentifierGenerationException: Unknown integral data type for ids : java.lang.String
    at org.hibernate.id.IdentifierGeneratorHelper.getIntegralDataTypeHolder(IdentifierGeneratorHelper.java:224)
    at org.hibernate.id.enhanced.SequenceStructure$1.getNextValue(SequenceStructure.java:98)
    at org.hibernate.id.enhanced.NoopOptimizer.generate(NoopOptimizer.java:40)
    at org.hibernate.id.enhanced.SequenceStyleGenerator.generate(SequenceStyleGenerator.java:432)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:105)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:675)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:667)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:662)
    at Main.main(Main.java:285)

该错误引发的唯一提示是该错误在此处的主类中:

The only hint that the error throws is that the error is in the main class here:

DoubleColumn c1 = new DoubleColumn("Datos varios");
        c1.addData(12);
        c1.addData(11);
        c1.addData(131);
        c1.addData(121);
        c1.addData(151);
        c1.addData(116);


        DataFrame datosHibernate = new DataFrame("Dataframe Hibernate");
        datosHibernate.addColumn(c1);


        Configuration hibernateConfig = new Configuration();
        SessionFactory sessionFactory = hibernateConfig.configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(datosHibernate);
        session.getTransaction().commit();
        session.disconnect();
        session.close();
        System.exit(0);

这些id是字符串，我将它们标注为@GeneratedValue(我认为我不需要自己对其进行初始化).关系@OneToMany具有级联注释，因此应正确映射.

The ids are Strings, and I have them annotated as @GeneratedValue (I think I do not need to initialize them myself). The relation @OneToMany have the cascade annotation so it should be mapped correctly.

我尝试了没有session.save行的代码，并且不会抛出错误，因此代码本身并不是问题，它必须与Hibernate有关.

I've tried the code WITHOUT the session.save line and doesn't throw errors, so is not a problem in the code per se, it has to be something with Hibernate.

我的配置文件是:

<hibernate-configuration>
    <session-factory>
        <property name="connection.url">jdbc:h2:E:/bd;DB_CLOSE_DELAY=-1;MVCC=TRUE</property>
        <property name="connection.driver_class">org.h2.Driver</property>
        <property name="connection.username">user</property>
        <property name="connection.password"></property>
        <property name="dialect">org.hibernate.dialect.H2Dialect</property>
        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">create</property>

        <mapping class="com.dataframe.estructuras.DataFrame"></mapping>
        <mapping class="com.dataframe.estructuras.column.AbstractColumn"/>
        <mapping class="com.dataframe.estructuras.column.types.DoubleColumn"/>
    </session-factory>
</hibernate-configuration>

它创建数据库文件，我看到生成的所有SQL代码，表和全部.发生故障时尝试存储信息的时间.

It creates the database file and I see all the SQL code generated, tables and all. Is when it tries to store the info when the thing breaks.

推荐答案

如果要将String用作数据库密钥，则需要使用UUID自动生成密钥.像这样:

If you want String to be database key you need to use UUID to automatically generate key. Something like this:

@Id @GeneratedValue(generator="system-uuid")
@GenericGenerator(name="system-uuid", strategy = "uuid")
private String myId;

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