[英]Field 'Id_employeer' doesn't have a default value
我不明白為什么我的應用程序丟棄異常“字段'Id_employeer'沒有默認值”。
Id_employeer
是我的主鍵,當我嘗試將任何信息保存到數據庫時,出現了該異常,但是,當我嘗試僅從DB中讀取信息時,它就起作用了。
我閱讀了關於StackOverflow的主題,但是我仍然不理解我的應用程序中的答案。 我正在使用Hibernate 5.2.11。
我的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>
我的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);
}
}
}
下一個CharacterInfo類
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;
}
}
主班
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);
}
}
最后異常
錯誤:字段“ Id_employeer”沒有默認值線程“主”中的異常org.hibernate.exception.GenericJDBCException:無法在org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47)上執行語句在org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)在org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)在org.hibernate.engine.jdbc org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:57)上的.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178)在org.hibernate.id.insert.AbstractReturningDelegate.performInsert(Abstract。 )org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2919)於org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3490)於org.hibernate.action.internal.Enti org的tyIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:626)org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:280)org .hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:261)在org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:306)在org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener .java:318),位於org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:275),位於org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:182),位於org.hibernate.event。在org.hibernate.event.internal.Def處的internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:113)在org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)在org.hibernate.event.internal.Def org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)上的aultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)在org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventorg.java:32) .hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)在org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:691)在org.hibernate.internal.SessionImpl.save(SessionImpl.java:683) )出現在org.hibernate.internal.SessionImpl.save(SessionImpl.java:678)出現在HibernateUtility.saving(HibernateUtility.java:17)出現在main.main(main.java:10)造成原因:java.sql.SQLException:Field 'Id_employeer'在com.mysql.jdbc.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)的com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)處沒有默認值.MysqlIO.checkErrorPacket(MysqlIO.java:3909)在 com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)上的com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2487) com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079)com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013) )com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104)com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998)org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate( ResultSetReturnImpl.java:175)...還有23
首先,如果您使用的是Hibernate批注,則無需使用Hibernate XML映射文件。
您的錯誤可能是由於您的數據庫架構。 Id_employeer列不是自動遞增的。
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