java ids的休眠未知整数数据类型
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Hibernate Unknown integral data type for ids
提问by Caronte Hades
I'm starting with Hibernate and I have an error that I just can't figure out.
我从 Hibernate 开始，但有一个我无法弄清楚的错误。
I have the following Classes:
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
}
Then I have
然后我有
@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
}
And finally:
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
}
The error I'm getting is:
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.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)
The only hint that the error throws is that the error is in the main class here:
错误抛出的唯一提示是错误在此处的主类中：
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);
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.
id 是字符串，我将它们注释为@GeneratedValue（我想我不需要自己初始化它们）。关系@OneToMany 具有级联注释，因此应该正确映射。
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.
我已经尝试了没有 session.save 行的代码并且没有抛出错误，所以代码本身不是问题，它必须是 Hibernate 的问题。
My configuration file is:
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>
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.
它创建了数据库文件，我看到了所有生成的 SQL 代码、表格和所有内容。是当它尝试在事情中断时存储信息时。
回答by user2026753
If you want String to be database key you need to use UUID to automatically generate key. Something like this:
如果您希望 String 作为数据库密钥，则需要使用 UUID 自动生成密钥。像这样的东西：
@Id @GeneratedValue(generator="system-uuid")
@GenericGenerator(name="system-uuid", strategy = "uuid")
private String myId;
