密钥“UK_tbce3olw19taxx6srova86xok”的重复条目“1”答案

【问题标题】：Duplicate entry '1' for key 'UK_tbce3olw19taxx6srova86xok'密钥“UK_tbce3olw19taxx6srova86xok”的重复条目“1”
【发布时间】：2013-10-07 11:16:37
【问题描述】：

大家好。

我正在尝试弄清楚如何处理 Hibernate。在我的测试中，我使用 Hibernate 继承，这是我遇到的异常：

Hibernate: select theuser0_.ID as ID1_2_0_, theuser0_.FIRST_NAME as FIRST_NA3_2_0_, theuser0_.LAST_NAME as LAST_NAM4_2_0_, theuser0_.PASSWORD as PASSWORD5_2_0_, theuser0_.EMALE as EMALE6_2_0_, theuser0_.GENDER as GENDER7_2_0_, theuser0_.UCI_PERSON_ADDRESS as UCI_PERS8_2_0_, theuser0_.UCI_PERSON_PHONE as UCI_PERS9_2_0_, theuser0_.USER_INFO_TYPE as USER_INF2_2_0_ from USER theuser0_ where theuser0_.ID=?
Hibernate: insert into USER_EVENTS (EVENT_DATE, USER_ID, EVENT_INDEX) values (?, ?, ?)
Oct 07, 2013 2:51:53 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1062, SQLState: 23000
Oct 07, 2013 2:51:53 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Duplicate entry '1' for key 'UK_tbce3olw19taxx6srova86xok'
Exception in thread "main" org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.springframework.orm.hibernate4.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:138)
    at org.springframework.orm.hibernate4.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:680)
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:562)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:755)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:724)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:475)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:270)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy7.saveUser(Unknown Source)
    at demidov.pkg.persistence.AppOut.main(AppOut.java:36)
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:74)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2975)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3487)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:377)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:214)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:194)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:178)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:321)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:206)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:191)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:735)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:727)
    at org.hibernate.engine.spi.CascadingAction$5.cascade(CascadingAction.java:258)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:388)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:331)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:209)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:418)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:358)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:334)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:209)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:166)
    at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:162)
    at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:153)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:89)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1234)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:404)
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:554)
    ... 9 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for key 'UK_tbce3olw19taxx6srova86xok'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4190)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4122)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2818)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2157)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2460)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2377)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2361)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133)
    ... 46 more

我确实有两个父实体：第一个是带有子类 UserInfo 的 TheUser：

public class TheUser {


    private int userId;

        public int getUserId() {
            return userId;
        }

        public void setUserId(int userId) {
            this.userId = userId;
        }



    private String userFirstName;

        public String getUserFirstName() {
            return userFirstName;
        }

        public void setUserFirstName(String userFirstName) {
            this.userFirstName = userFirstName;
        }



    private String userLastName;

        public String getUserLastName() {
            return userLastName;
        }

        public void setUserLastName(String userLastName) {
            this.userLastName = userLastName;
        }



    private String userPassword;

        public String getUserPassword() {
            return userPassword;
        }

        public void setUserPassword(String userPassword) {
            this.userPassword = userPassword;
        }



    private String userEmale;

        public String getUserEmale() {
            return userEmale;
        }

        public void setUserEmale(String userEmale) {
            this.userEmale = userEmale;
        }



    private String userGender;

        public String getUserGender() {
            return userGender;
        }

        public void setUserGender(String userGender) {
            this.userGender = userGender;
        }



    private List<UserEvents> userEventsList = new ArrayList<UserEvents>();

        public List<UserEvents> getUserEventsList() {
            return userEventsList;
        }

        public void setUserEventsList(List<UserEvents> userEventsList) {
            this.userEventsList = userEventsList;
        }

这是 TheUser 的 xml 映射：

<class name="demidov.pkg.domain.TheUser" table="USER">

    <id name="userId" column="ID">
        <generator class="native"/>
    </id>


    <discriminator  column="USER_INFO_TYPE" type="string"/>


    <property name="userFirstName" column="FIRST_NAME" type="string"/>
    <property name="userLastName" column="LAST_NAME" type="string"/>
    <property name="userPassword" column="PASSWORD" type="string"/>
    <property name="userEmale" column="EMALE" type="string"/>
    <property name="userGender" column="GENDER" type="string"/>


    <list name="userEventsList" inverse="false" lazy="true" fetch="select" cascade="all" >

        <key column="USER_ID" not-null="true" />

        <index column="EVENT_INDEX" />          

        <one-to-many class="demidov.pkg.domain.UserEvents"/>        

    </list>


    <subclass name="demidov.pkg.domain.UserContactInfo" discriminator-value="UCI" >

        <property name="personAddress" column="UCI_PERSON_ADDRESS" />
        <property name="personPhoneNumber" column="UCI_PERSON_PHONE" />

    </subclass>


</class>

以及带有子类的 UserEvents：ComputerMaintenanceEvent 和 SoftwareDevelopmentEvent 实体：

public class UserEvents {



    private int userEventId;

        public int getUserEventId() {
            return userEventId;
        }

        public void setUserEventId(int userEventId) {
            this.userEventId = userEventId;
        }



    private Date userEventDate;     

        public Date getUserEventDate() {
            return userEventDate;
        }

        public void setUserEventDate(Date userEventDate) {
            this.userEventDate = userEventDate;
        }



    protected TheUser theUser;

        public TheUser getTheUser() {
            return theUser;
        }

        public void setTheUser(TheUser theUser) {
            this.theUser = theUser;
        }

}

用xml映射userevent：

<hibernate-mapping>


            <class name="demidov.pkg.domain.UserEvents" table="USER_EVENTS">


                <id name="userEventId" column="ID" type="integer">
                    <generator class="native"/>
                </id>


                <property name="userEventDate" column="EVENT_DATE" type="date"/>


                <many-to-one name="theUser" class="demidov.pkg.domain.TheUser" insert="false" update="false" lazy="false" fetch="select" cascade="save-update">
                    <column name="USER_ID" not-null="true" unique="true" />
                </many-to-one>


                <joined-subclass name="demidov.pkg.domain.ComputerMaintenanceEvent" table="MAINTENANCE_EVENT">

                    <key column="MAINTENANCE_ID" not-null="true"/>

                    <property name="descriptionMaintenance" column="DESCRIPTION_MAINTENANCE" type="string"/>
                    <property name="additionalInfoMaintenance" column="ADDITIONAL_INFO_MAINTENANCE" type="string"/>

                </joined-subclass>              


                <joined-subclass name="demidov.pkg.domain.SoftwareDevelopmentEvent" table="DEVELOPMENT_EVENT">

                    <key column="DEVELOPMENT_ID" not-null="true"/>

                    <property name="descriptionDevelopment" column="DESCRIPTION_DEVELOPMENT" type="string"/>
                    <property name="additionalInfoDevelopment" column="ADDITIONAL_INFO_DEVELOPMENT" type="string"/>

                </joined-subclass>


            </class>


        </hibernate-mapping>

在数据库中我已经插入了一次数据：

TheUser 实体 + subclass= 每个层次结构的继承表：

+----+----------------------------+------------+-----------+----------+-----------------+--------+--------------------+------------------+
| ID | USER_INFO_TYPE             | FIRST_NAME | LAST_NAME | PASSWORD | EMALE           | GENDER | UCI_PERSON_ADDRESS | UCI_PERSON_PHONE |
+----+----------------------------+------------+-----------+----------+-----------------+--------+--------------------+------------------+
|  1 | demidov.pkg.domain.TheUser | Vadim      | Demidov   | 123123   | vadim@google.ru | Male   | NULL               | NULL             |
+----+----------------------------+------------+-----------+----------+-----------------+--------+--------------------+------------------+

在 UserEvent 和子类之间：SoftwareDevelopmentEvent 和 ComputerMaitnanceEvent 是每个子类继承的表。

数据库中的 UserEvents 表：

+----+------------+---------+-------------+
| ID | EVENT_DATE | USER_ID | EVENT_INDEX |
+----+------------+---------+-------------+
|  1 | 2013-10-07 |       1 |           0 |
+----+------------+---------+-------------+

UserEvents 的子类 - SoftwareDevelopmentEvent：

+----------------+-------------------------+-----------------------------+
| DEVELOPMENT_ID | DESCRIPTION_DEVELOPMENT | ADDITIONAL_INFO_DEVELOPMENT |
+----------------+-------------------------+-----------------------------+
|              1 | Create website          | Create news portal          |
+----------------+-------------------------+-----------------------------+

我正在尝试向现有用户添加新事件：

public void saveUser(Integer id, List<UserEvents> listEvents) {

        Session session = sessionFactory.getCurrentSession();

        TheUser theuser = (TheUser)session.get(TheUser.class, id);

        theuser.setUserEventsList(listEvents);

        session.saveOrUpdate(theuser);

    }

主要方法：

List<UserEvents> eventsList = new ArrayList<UserEvents>();


        ComputerMaintenanceEvent sde = new ComputerMaintenanceEvent();
        sde.setDescriptionMaintenance("Fix PC");
        sde.setAdditionalInfoMaintenance("Fix my PC please");
        sde.setUserEventDate(new Date());
        eventsList.add(sde);


        dao.saveUser(1, eventsList);

请帮忙。向您致以最诚挚的谢意。

^已解决的问题：问题出在我的 userevent.hbm.xml 中，我无意中将 unique="true" 设置为关系。

谢谢大家。

【问题讨论】：

标签： mysql hibernate persistence hibernate-mapping

【解决方案1】：

您正在使用本机生成器类。

<generator class="native"/>

当您使用原生生成器时，您需要在数据库中创建一个序列。创建名为 HIBERNATE_SEQUENCE 的任何序列，然后尝试运行代码。

也是因为下面的代码

dao.saveUser(1, eventsList);

每次执行程序时，程序都会尝试保存 id 为 1 的用户，但 id 为 1 的用户已经存在并且约束失败并且您得到异常。如果您希望自己处理，则需要保持 id 的唯一性。否则不要提供 id 并让 hibernate 使用底层序列为您生成它

【讨论】：

是的。我从这本书中得到它本地身份生成器根据底层数据库的功能选择其他本地 AUTO 身份生成器，例如身份、序列或 hilo。使用此生成器可将您的映射元数据移植到不同的数据库管理系统。
HIBERNATE_SEQUENCE 存在吗？因为如果我添加它，我得到：在类路径资源 [spring-context.xml] 中定义名称为“sessionFactory”的 bean 创建错误：init 方法的调用失败；嵌套异常是 org.hibernate.MappingException：无法实例化 id 生成器 [entity-name=demidov.pkg.domain.TheUser]
您可以在映射中提供序列名称，也可以在 mysql DB 中创建名称为“HIBERNATE_SEQUENCE”的序列。 Hibernate 会选择这个默认序列并生成 id

【解决方案2】：

我也有同样的例外。

当为类属性设置正确的关系时，我已经修复了它。我无意中设置了@OneToOne 关系，并试图将其用作@ManyToOne。当我设置正确的关系时，问题就消失了。

【讨论】：