Le champ 'Id_employeer' n'a pas de valeur par défaut

Question

Je ne comprends pas pourquoi mon application supprime Exception "Field 'Id_employeer' n'a pas de valeur par défaut".

Id_employeer est ma clé primaire, quand j'essaye d'enregistrer n'importe quelle information dans ma base de données j'ai obtenu cette exception, mais, quand j'essaye juste de lire l'information de DB cela fonctionne. Je lis le sujet sur StackOverflow, mais je ne comprends toujours pas les réponses dans mon application. Je travaille avec Hibernate 5.2.11.

Mon CharacterInfo.hbm.xml:

<?xml version="1.0"?> 

<!-- 
    ~ Hibernate, Relational Persistence for Idiomatic Java 
    ~ 
    ~ License: GNU Lesser General Public License (LGPL), version 2.1 or later. 
    ~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>. 
    --> 
<!DOCTYPE hibernate-mapping PUBLIC 
     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 

    <class name="CharacterInfo" table="employees"> 
     <id name="Id" column="id_employeer"> 
      <generator class="native"/> 
     </id> 
     <property name="Login" column="employeer_login"/> 



    </class> 

</hibernate-mapping> 

Mon HibernateUtility:

import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.boot.MetadataSources; 
import org.hibernate.boot.registry.StandardServiceRegistry; 
import org.hibernate.boot.registry.StandardServiceRegistryBuilder; 
import java.util.List; 


public class HibernateUtility { 


    SessionFactory sessionFactory; 

    public void saving(Object object){ 
     Session session = sessionFactory.openSession(); 
     session.beginTransaction(); 
     session.save(object); 
     //session.save(new CharacterInfo().getLogin()); 
     session.getTransaction().commit(); 
     session.close(); 
    } 

    public void reading(){ 
     Session session = sessionFactory.openSession(); 
     session.beginTransaction(); 
     List result = session.createQuery("from CharacterInfo").list(); 
     for (CharacterInfo characterInfo : (List<CharacterInfo>) result) { 
      System.out.println("CharacterInfo (" + characterInfo.getLogin() + ") : " + characterInfo.getLogin()); 
     } 
     session.getTransaction().commit(); 
     session.close(); 
    } 


    protected void setUp() throws Exception { 

     final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure() 
       .build(); 

     try { 
      sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory(); 


     } catch (Exception e) { 
      StandardServiceRegistryBuilder.destroy(registry); 
     } 
    } 




} 

Suivant CharacterInfo classe

import org.hibernate.annotations.GenericGenerator; 

import javax.persistence.*; 


@Entity 
@Table(name = "employees") 
public class CharacterInfo { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "Id_employeer") 
    private int id ; 

    @Column(name = "employeer_Login") 
    private String login; 


    public CharacterInfo() {} 

    public int getId() { 
     return id; 

    } 

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


    public String getLogin() { 
     return login; 
    } 

    public void setLogin(String login) { 
     this.login = login; 
    } 



} 

classe principale

public class main { 


    public static void main(String args[]) throws Exception { 
     HibernateUtility hibernateUtility = new HibernateUtility(); 
     CharacterInfo characterInfo = new CharacterInfo(); 
     characterInfo.setId(1); 
     characterInfo.setLogin("PawJaw"); 
     hibernateUtility.setUp(); 
     hibernateUtility.saving(characterInfo); 


    } 
} 

et à la fin Exception

ERROR: Field 'Id_employeer' doesn't have a default value Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not execute statement at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47) at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111) at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97) at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178) at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:57) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:42) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2919) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3490) at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81) at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:626) at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:280) at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:261) at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:306) at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:318) at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:275) at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:182) at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:113) 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:691) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:683) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:678) at HibernateUtility.saving(HibernateUtility.java:17) at main.main(main.java:10) Caused by: java.sql.SQLException: Field 'Id_employeer' doesn't have a default value at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2487) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079) at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013) at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998) at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175) ... 23 more

Answer 1

Tout d'abord, si vous utilisez des annotations Hibernate, vous n'avez pas besoin d'utiliser des fichiers de mapping XML Hibernate.

Votre erreur est probablement due au schéma de votre base de données. La colonne Id_employeer n'est pas auto-incrémentée.