Java GWT中的休眠错误

我遇到了一个休眠错误。我只是在做一个概念验证来测试hibernate中的关联。我几乎可以肯定，我认为错误在于映射文件中，但我无法找到它

我使用的例子是，一个用户可以有多台计算机，但一台计算机只能供一个用户使用

我的ModuleLoad有点类似于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");
            }});

    }

计算机映射文件：

<?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>

<?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>

我得到的错误是：

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

用户映射文件：

<?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>

<?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>

另一个文件肯定很好，因为我在没有hibernate的情况下对它们进行了测试

---

如果有人能提供帮助，那就太好了

确保表中没有任何触发器会干扰插入/更新。有时，触发器会覆盖插入的结果，这会欺骗hibernate，使其认为插入不成功。

在hibernate中指定的生成器处于休眠状态时，您需要选择一个不同的未保存值，以告知hibernate确定是插入还是更新。默认实现查看id列是否为null。由于是手动分配，因此即使未保存的实体也会有id，Hibernate将尝试执行更新而不是插入

---

阅读

的ID部分（特别是5.1.2.2.5）。不，我还没有在数据库上实现任何过程。我不认为这是导致此错误的原因，但您确实需要在实体类中实现

equals（）

和

hashcode（）

，否则您将遇到其他问题。

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

<?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>