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EclipseLink:以MongoDB作为持久层的继承

persistence.xml eclipselink jersey jpa mongodb

Scyla101 · 技术社区 · 6 年前

实体 @字段(name=“_id”) 实体 @XML根元素公共类扩展类扩展AbstractClass{ 私有字符串名称; } this.name=名称;

以下是我正在使用的文件: persistence.xml


   <persistence version=“2.1”xml ns=“http://xmlns.jcp.org/xml/ns/persistence”xmlns:xsi=“http://www.w3.org/2001/xmlschema-instance”xsi:schemalocation=“http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence\u 2_1.xsd”>
<class>org.example.webapp.resources.test.extendedClass</class>
<property name=“eclipselink.target database”value=“org.eclipse.persistence.nosql.adapters.mongo.mongoplatform”/>gt;
<property name=“eclipselink.nosql.property.mongo.host”value=“IP地址”/>
   
    
@路径(“持久/扩展对象”)
公共字符串addobject(@queryparam(“name”)final string name){


extendedClass theObject=new extendedClass(id,name);





em.close();

}





@生成(mediatype.application)


entityManager em=emf.createntityManager();


list<extendedClass>extendedClassList=em.createQuery(“从extendedClass A中选择a”,extendedClass.class).getResultList();

em.close();

}

这将产生以下异常:



调用:执行mappedinteraction()。
properties=>mongo.operation=find,mongo.collection=abstractClass_
$and=>[数据库记录(
在Org.Eclipse中.持久性.eIS.EISExtExtReaveExtExebug(EISExtExist.java:65)
在Org.Eclipse中.持久性.eIS.EISExtExtReaveExtExebug(EISExtExist.java:78)
在Org.Eclipse中。
在Org.Eclipse中。持久性。查询。ObjutalRealQueQuest.ExcExtDeabaseAdQuy(ObjutalRealQualQuest.java:1155)
在Org.Eclipse中。持久性.Qual.RealAlqQue.Excel(RealAlqQue.java:402)
在Org.Eclipse中.Primult.Neal.Studio.UnWorkFiffiL.IntualExcExtQueQuy(UNITOFWorkIMP.java:2894)
在Org.Eclipse中.Primest.jp.QueIIMP.GETReultList.(QuyIMP.java:468)
在Sun.Real.nTyvEndoDealOrthIMP.LoCKE(NATEVEMEDAccess ORIL .java:62)
在Java方法调用(方法:Java 498)
在Org.gassFiels.Sersi.Melo.My.ActudioJavaRealCysMeDeDeCorter 1美元.运行(抽象JavaRealCyMeDoDebug). Java:144)
在Org.GasasFISH.Serv.Mulk.My.javaRealCyMeDeDebug Services $ Type OutoPo.Ko.DoDebug(JavaRealthMyDoDebug Services提供程序. Java:247)
在Org.GasasFiels.Sersi.Serv.MultReMyDoDeCork.Apple(ReavigyDoDeCork.java:102)
在GrasFISH。泽西。内部。错误1美元。调用(错误。Java:271)
在GrasFISH。泽西。内部。错误。过程(错误。Java:315)
在GrasFISH服务器上,Server RunTime.进程(ServRunTime.java:316)
在Org.GalasFISH.JeSe.servlet .WebCypultEclipse(WebCyp.java:418)
在Org.GalasFiels.Jelsi.servlet .Servlet容器. Service(Servlet容器. Java:389)
在Org.Apache .Tomcat .WebSoC.Server .WS滤镜.DoFulter(WSField.java:52)
在Org.Apache .Calalina .Cype .FieldFieldCork.DoFulter(Apple)FieldStork.java:206)
在Org.Acache .Calalina .Cort.Stand AdExtCort.Cube(Stand AdvutoTork.java:106)
在Org.Acache .Calalina .Corn.StaldHoistPort.CuoKe(StaldHistort.java:142)
在Org.Apache .Calalina .Cudio.Access Access阀门.调用(ActudiAccess LogPort.java:610)
在Org.Apache .Calalina .Cornor.CyoToAddio.Service(CyoToAddio.java:537)
在Org.Apache .Tomcat .UTL.NET.NooEndotSoCoCompultor.Dorun(NooEndoPo.java:1566)
由于:javax.resource.resourceexception:org.bson.codecs.configuration.codecconfigurationexception:找不到类org.eclipse.persistence.internal.helper.databasefield的编解码器。
在COM.MangGDB .DBOBJCTCODEC .RealValueUE(DBOBJCTCODEC . Java:231)
在COM.MangGDB .DBOBJCTCODEC .RealValueUE(DBOBJCTCODEC . Java:219)
在COM.MangGDB .DBOBJCTCODEC .EnCODE(DBOBJCTCODEC,Java:65)
在Org.BSO.CODES. BSONDCONTRON WRAPPARCODEC .EnCODE(BSONCONTRON WRAPPARCODEC . Java:29)
在Org.BSO.CODES. BSONDCONTCONDECODEC .RealValueE(BSONDCONTROCONDECOD.JAVA:136)
在B.SON.BSON.编解码器. BSONDCONTENCODEC .EnCODE(BSONDCONMENTCONDEC . Java:41)
在COM.MangGDB连接.RealStestMulk.AddioDebug(ReavestMeava. Java:188)
在COM.MangGDB .CONTION.CurdPrimuloIMP.Exctudio(CurdPrimuloIMP.java:70)
在COM.MangGDB。
在COM.MangGDB .Client .No.MGOcliclient委托$CuffATEORATION执行器.执行(Mungclient委托. Java:140)
在COM.MangGDB .Client .No.MangoTeAbabl IMPL迭代器(MangoTracabliIMP.java:86)
……71个以上

有人知道为什么会发生这个错误吗?根据EclipseLink的文档,当使用NoSQL数据库时,它应该能够很好地处理继承:https://wiki.eclipse.org/eclipseLink/faq/nosql


我还测试了一个没有继承的版本,在那里提取WebService工作得很好。






一如既往地,我们感谢您的帮助。


实体
@nosql(dataformat=dataformattype.mapped)
@xmlAccessorType(xmlAccessType.Field)

@身份证
受保护的字符串ID;


}



@Entity
@NoSql(dataFormat=DataFormatType.MAPPED)
public abstract class AbstractClass {

    @Id
    @Field(name="_id")
    protected String id;

    public String getId() {

        return this.id;
    }
}




@Entity
@NoSql(dataFormat=DataFormatType.MAPPED)
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class ExtendedClass extends AbstractClass {

    @Basic
    private String name;

    public ExtendedClass() {

    }

    public ExtendedClass(String id, String name) {

        this.id = id;
        this.name = name;
    }

    public String getName() {

        return this.name;
    }
}


persistence.xml我使用的文件:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
    <persistence-unit name="persistence-unit" transaction-type="RESOURCE_LOCAL">
        <class>org.example.webapp.resources.test.AbstractClass</class>
        <class>org.example.webapp.resources.test.ExtendedClass</class>
        <properties>
            <property name="eclipselink.target-database" value="org.eclipse.persistence.nosql.adapters.mongo.MongoPlatform"/>                         
            <property name="eclipselink.nosql.connection-spec" value="org.eclipse.persistence.nosql.adapters.mongo.MongoConnectionSpec"/>
            <property name="eclipselink.nosql.property.mongo.port" value="27017"/>
            <property name="eclipselink.nosql.property.mongo.host" value="ip-address"/>
            <property name="eclipselink.nosql.property.mongo.db" value="database-name"/>
            <property name="eclipselink.logging.level" value="FINEST"/>
        </properties>
    </persistence-unit>
</persistence>


ExtendedClass以下内容:

@PUT
@Path("persist/extended-object")
@Consumes(MediaType.APPLICATION_JSON)
public String addObject(@QueryParam("name") final String name) {

    final String id = UUID.randomUUID().toString();

    ExtendedClass theObject = new ExtendedClass(id, name);

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("persistence-unit");

    EntityManager em = emf.createEntityManager();

    em.getTransaction().begin();

    em.persist(theObject);

    em.getTransaction().commit();
    em.close();

    return "Persisted object with name: " + name;
}




http://localhost:8080/webapp/webapi/test/persist/extended-object?name=test-abstraction



到现在为止,一直都还不错。但是,如果我试图获取包含所有持久化对象的列表,我会遇到一个问题。下面是WebService示例:

@GET
@Path("get/all")
@Produces(MediaType.APPLICATION_JSON)
public List<ExtendedClass> getAllExtendedClasses() {

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("persistence-unit");

    EntityManager em = emf.createEntityManager();

    em.getTransaction().begin();

    List<ExtendedClass> extendedClassList = em.createQuery("SELECT a FROM ExtendedClass a", ExtendedClass.class).getResultList();

    em.getTransaction().commit();
    em.close();

    return extendedClassList;
}   




javax.resource.ResourceException: org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.eclipse.persistence.internal.helper.DatabaseField.

完整堆栈跟踪:

Exception [EclipseLink-90000] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.eis.EISException
Internal Exception: javax.resource.ResourceException: org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.eclipse.persistence.internal.helper.DatabaseField.
Error Code: 000
Call: Executing MappedInteraction()
    spec => null
    properties => {mongo.operation=FIND, mongo.collection=ABSTRACTCLASS}
    input => [DatabaseRecord(
    $and => [DatabaseRecord(
    EXTENDEDCLASS._id => ABSTRACTCLASS._id), DatabaseRecord(
    ABSTRACTCLASS.DTYPE => ExtendedClass)])]
Query: ReadAllQuery(referenceClass=ExtendedClass jpql="SELECT a FROM ExtendedClass a")
    at org.eclipse.persistence.eis.EISException.resourceException(EISException.java:65)
    at org.eclipse.persistence.eis.EISException.resourceException(EISException.java:74)
    at org.eclipse.persistence.eis.EISException.resourceException(EISException.java:78)
    at org.eclipse.persistence.eis.EISAccessor.basicExecuteCall(EISAccessor.java:212)
    at org.eclipse.persistence.eis.EISAccessor.executeCall(EISAccessor.java:112)
    at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1995)
    at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:570)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:299)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:694)
    at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2714)
    at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2667)
    at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:477)
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1155)
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1114)
    at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:402)
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1202)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2894)
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1797)
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1779)
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1744)
    at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:258)
    at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:468)
    at org.example.webapp.resources.test.ObjectWebServices.getAllExtendedClasses(ObjectWebServices.java:54)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:74)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:247)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:388)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:346)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
    at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:337)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:280)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:316)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1084)
    at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:418)
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:372)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
Caused by: javax.resource.ResourceException: org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.eclipse.persistence.internal.helper.DatabaseField.
    at org.eclipse.persistence.internal.nosql.adapters.mongo.MongoDatabaseInteraction.execute(MongoDatabaseInteraction.java:201)
    at org.eclipse.persistence.eis.EISAccessor.basicExecuteCall(EISAccessor.java:163)
    ... 70 more
Caused by: org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.eclipse.persistence.internal.helper.DatabaseField.
    at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46)
    at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63)
    at org.bson.codecs.configuration.ChildCodecRegistry.get(ChildCodecRegistry.java:51)
    at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:231)
    at com.mongodb.DBObjectCodec.encodeMap(DBObjectCodec.java:241)
    at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:217)
    at com.mongodb.DBObjectCodec.encodeIterable(DBObjectCodec.java:292)
    at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:219)
    at com.mongodb.DBObjectCodec.encode(DBObjectCodec.java:149)
    at com.mongodb.DBObjectCodec.encode(DBObjectCodec.java:65)
    at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
    at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
    at org.bson.codecs.EncoderContext.encodeWithChildContext(EncoderContext.java:91)
    at org.bson.codecs.BsonDocumentCodec.writeValue(BsonDocumentCodec.java:136)
    at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:115)
    at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:41)
    at com.mongodb.connection.RequestMessage.addDocument(RequestMessage.java:238)
    at com.mongodb.connection.RequestMessage.addDocument(RequestMessage.java:188)
    at com.mongodb.connection.CommandMessage.encodeMessageBodyWithMetadata(CommandMessage.java:154)
    at com.mongodb.connection.RequestMessage.encode(RequestMessage.java:138)
    at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:236)
    at com.mongodb.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:98)
    at com.mongodb.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:441)
    at com.mongodb.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:70)
    at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:192)
    at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:264)
    at com.mongodb.connection.DefaultServerConnection.command(DefaultServerConnection.java:126)
    at com.mongodb.connection.DefaultServerConnection.command(DefaultServerConnection.java:118)
    at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:226)
    at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:217)
    at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:120)
    at com.mongodb.operation.FindOperation$1.call(FindOperation.java:717)
    at com.mongodb.operation.FindOperation$1.call(FindOperation.java:711)
    at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:471)
    at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:415)
    at com.mongodb.operation.FindOperation.execute(FindOperation.java:711)
    at com.mongodb.operation.FindOperation.execute(FindOperation.java:83)
    at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:140)
    at com.mongodb.client.internal.MongoIterableImpl.execute(MongoIterableImpl.java:132)
    at com.mongodb.client.internal.MongoIterableImpl.iterator(MongoIterableImpl.java:86)
    at org.eclipse.persistence.internal.nosql.adapters.mongo.MongoDatabaseInteraction.execute(MongoDatabaseInteraction.java:173)
    ... 71 more


https://wiki.eclipse.org/EclipseLink/FAQ/NoSQL





此外,我测试了一个实现,其中AbstractClass

ABSTRACTCLASSEXTENDEDCLASS







Frank Caputos@Inheritance属性。这就是我的抽象类目前的情况,它似乎在为我的目的工作:

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@NoSql(dataFormat=DataFormatType.MAPPED)
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public abstract class AbstractClass {

    @Id
    @Field(name="_id")
    protected String id;

    public String getId() {

        return this.id;
    }
}

2 回复 | 直到 6 年前

Frank Caputo 6 年前

@Entity
@NoSql(dataFormat=DataFormatType.MAPPED)
@DiscriminatorColumn(name = "type")
public abstract class AbstractClass {

    @Id
    @Field(name="_id")
    protected String id;

    public String getId() {

        return this.id;
    }
}

@Entity
@NoSql(dataFormat=DataFormatType.MAPPED)
@DiscriminatorValue("extended")
public class ExtendedClass extends AbstractClass {

    @Basic
    private String name;

    public ExtendedClass() {

    }

    public ExtendedClass(String id, String name) {

        this.id = id;
        this.name = name;
    }

    public String getName() {

        return this.name;
    }
}

您可能还需要在@nosql中设置数据类型为的集合名称。

Scyla101 6 年前

@Inheritace 使其工作的属性。这就是抽象类看起来知道哪一个对我来说是可行的解决方案的方式:

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@NoSql(dataFormat=DataFormatType.MAPPED)
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public abstract class AbstractClass {

    @Id
    @Field(name="_id")
    protected String id;

    public String getId() {

        return this.id;
    }
}