GWT中的休眠錯誤

Question

我收到一個休眠錯誤。 我只是在做一個概念驗證來測試休眠狀態下的關聯。 我幾乎可以肯定，我認為錯誤在於映射文件中，但我無法弄清楚

我使用的示例是，一個用戶可以有許多計算機，但是一個計算機僅適用於一個用戶

我的ModuleLoad有點類似於Java中的main

public void onModuleLoad() 
    {
        GreetingServiceAsync S = GWT.create(GreetingService.class);
        ((ServiceDefTarget) S).setServiceEntryPoint( GWT.getModuleBaseURL() +"greet");

        Computer C1= new Computer(1,"ad");
        Computer C2= new Computer(2,"ad");
        Computer C3= new Computer(3,"ad");
        Set <Computer> S1= new HashSet();
        S1.add(C2);S1.add(C3);S1.add(C1);

        Users U1= new Users(1,S1);
        S.greetServer(U1, new AsyncCallback <Users>(){

            @Override
            public void onFailure(Throwable caught) {
                // TODO Auto-generated method stub
                Window.alert("Failure");

            }

            @Override
            public void onSuccess(Users result) {
                // TODO Auto-generated method stub
                Window.alert("Success");
            }});

    }

Users類：

    import java.util.HashSet;
    import java.util.List;
    import java.util.Set;

    import net.sf.gilead.pojo.gwt.LightEntity;

    import com.google.gwt.user.client.rpc.IsSerializable;

    public class Users extends LightEntity implements IsSerializable
    {
        private long UserId;
        private Set <Computer> Computers=new HashSet <Computer> ();

        public Users(){}
        public Users(long userId, Set <Computer> computers) 
        {
            UserId = userId;
            Computers = computers;
        }
        public long getUserId() {
            return UserId;
        }
        public void setUserId(long userId) {
            UserId = userId;
        }
        public Set <Computer> getComputers() {
            return Computers;
        }
        public void setComputers(Set<Computer> computers) {
            Computers = computers;
        }
    }

Computer Class:

    import net.sf.gilead.pojo.gwt.LightEntity;

    import com.google.gwt.user.client.rpc.IsSerializable;

    public class Computer extends LightEntity implements IsSerializable
    {
        private long ComputerId;
        private String Description;

        public Computer(){}
        public Computer(long ComputerId,String Description)
        {
            this.ComputerId=ComputerId;
            this.Description=Description;
        }

        public long getComputerId() {
            return ComputerId;
        }
        public void setComputerId(long computerId) {
            ComputerId = computerId;
        }
        public String getDescription() {
            return Description;
        }
        public void setDescription(String description) {
            Description = description;
        }
    }

Users Mapping File:
  <?xml version="1.0"?>
        <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
        <!-- Generated Dec 3, 2010 5:21:42 AM by Hibernate Tools 3.4.0.Beta1 -->
        <hibernate-mapping>
            <class name="com.BiddingSystem.domain.Users" table="USERS">
                <id name="UserId" type="long">
                    <column name="USERID" />
                    <generator class="assigned" />
                </id>
                <set name="Computers" table="COMPUTER" inverse="false" lazy="true">
                    <key>
                        <column name="USERID" />
                    </key>
                    <one-to-many class="com.BiddingSystem.domain.Computer" />
                </set>
            </class>
        </hibernate-mapping>

電腦課：

import net.sf.gilead.pojo.gwt.LightEntity;

import com.google.gwt.user.client.rpc.IsSerializable;

public class Computer extends LightEntity implements IsSerializable
{
    private long ComputerId;
    private String Description;

    public Computer(){}
    public Computer(long ComputerId,String Description)
    {
        this.ComputerId=ComputerId;
        this.Description=Description;
    }

    public long getComputerId() {
        return ComputerId;
    }
    public void setComputerId(long computerId) {
        ComputerId = computerId;
    }
    public String getDescription() {
        return Description;
    }
    public void setDescription(String description) {
        Description = description;
    }
}

計算機映射文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 3, 2010 5:21:42 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
    <class name="com.BiddingSystem.domain.Computer" table="COMPUTER">
        <id name="ComputerId" type="long">
            <column name="COMPUTERID" />
            <generator class="assigned" />
        </id>
        <property name="Description" type="java.lang.String">
            <column name="DESCRIPTION" />
        </property>
    </class>
</hibernate-mapping>

休眠配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
        <property name="hibernate.connection.url">jdbc:postgresql://localhost/postgres</property>
        <property name="hibernate.connection.username">postgres</property>
        <property name="hibernate.connection.password">noor</property>
        <property name="hibernate.connection.pool_size">10</property>
        <property name="show_sql">true</property>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <property name="current_session_context_class">thread</property> 
        <mapping resource="com/BiddingSystem/domain/Users.hbm.xml"/>
        <mapping resource="com/BiddingSystem/domain/Computer.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

服務器實現將保存到數據庫：

import java.util.ArrayList;
import java.util.List;

import net.sf.gilead.core.PersistentBeanManager;
import net.sf.gilead.core.hibernate.HibernateUtil;
import net.sf.gilead.core.store.stateless.StatelessProxyStore;
import net.sf.gilead.gwt.PersistentRemoteService;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.BiddingSystem.client.GreetingService;

import com.BiddingSystem.domain.Users;


import com.google.gwt.user.server.rpc.RemoteServiceServlet;
public class GreetingServiceImpl extends PersistentRemoteService implements GreetingService 
{

    private static final long serialVersionUID = 1L;
    private HibernateUtil gileadHibernateUtil = new HibernateUtil();
    public GreetingServiceImpl ()
    {
         gileadHibernateUtil.setSessionFactory(com.BiddingSystem.server.HibernateUtil.getSessionFactory());

                PersistentBeanManager persistentBeanManager = new PersistentBeanManager();
                persistentBeanManager.setPersistenceUtil(gileadHibernateUtil);
                persistentBeanManager.setProxyStore(new StatelessProxyStore());

                setBeanManager(persistentBeanManager);
    }

    public Users greetServer(Users S) 
    {
        Session session = gileadHibernateUtil.getSessionFactory().openSession();
        Transaction tr= session.beginTransaction();
        session.save(S);
        tr.commit();
        session.close();
         return S;
      }


}

我得到的錯誤：

Caused by: org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:85)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:70)
    at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:90)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:183)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
    at com.BiddingSystem.server.GreetingServiceImpl.greetServer(GreetingServiceImpl.java:44)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:174)
    ... 21 more

用戶映射文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 3, 2010 5:21:42 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
    <class name="com.BiddingSystem.domain.Users" table="USERS">
        <id name="UserId" type="long">
            <column name="USERID" />
            <generator class="assigned" />
        </id>
        <set name="Computers" table="COMPUTER" inverse="false" lazy="true">
            <key>
                <column name="USERID" />
            </key>
            <one-to-many class="com.BiddingSystem.domain.Computer" />
        </set>
    </class>
</hibernate-mapping>

另一個文件肯定很好，因為我沒有休眠就對其進行了測試

如果有人可以幫助，那就太好了

Answer 1

將分配的生成器置於休眠狀態時，您需要選擇其他未保存的值來告訴休眠狀態以確定是否要插入或更新。 默認實現看起來是看id列是否為空。 由於您是手動分配的，因此即使未保存的實體也將具有ID，並且Hibernate將嘗試執行UPDATE而不是INSERT。

閱讀Hibernate文檔的ID部分（特別是5.1.2.2.5）

Answer 2

確保您沒有該表的任何與插入/更新混淆的觸發器。 有時，觸發器會覆蓋插入的結果，這會導致休眠狀態以為插入未成功。