Apache spark 编组无法在MarkLogic中使用JAXBHandle
我想将以下对象存储到MarkLogic中Apache spark 编组无法在MarkLogic中使用JAXBHandle,apache-spark,jaxb,marklogic,apache-spark-mllib,Apache Spark,Jaxb,Marklogic,Apache Spark Mllib,我想将以下对象存储到MarkLogic中 @XmlRootElement(name = "trainModel") @XmlAccessorType(XmlAccessType.FIELD) public class TrainedModel implements Serializable { private static final long serialVersionUID = 1L; private String modelName; pri
@XmlRootElement(name = "trainModel")
@XmlAccessorType(XmlAccessType.FIELD)
public class TrainedModel implements Serializable {
private static final long serialVersionUID = 1L;
private String modelName;
private CrossValidatorModel crossValidatorModel;
public String getModelName() {
return modelName;
}
public void setModelName(String modelName) {
this.modelName = modelName;
}
public CrossValidatorModel getCrossValidatorModel() {
return crossValidatorModel;
}
public void setCrossValidatorModel(CrossValidatorModel crossValidatorModel) {
this.crossValidatorModel = crossValidatorModel;
}
@Override
public String toString() {
return "TrainedModel [modelName=" + modelName + ", crossValidatorModel=" + crossValidatorModel + "]";
}
}
我使用JAXBHandle来完成我的需求,但在将TrainedModel对象存储到MarkLogic中时,CrossValidatorModel变为空
CrossValidatorModel是由org.apache.spark.ml.tuning.CrossValidatorModel
提供的外部对象
我试过下面的代码
CrossValidatorModel crossValidatorModel = createDataFrame(null);
TrainedModel trainedModel = new TrainedModel();
trainedModel.setModelName("sample");
trainedModel.setCrossValidatorModel(crossValidatorModel);
JAXBContext context = JAXBContext.newInstance(TrainedModel.class);
JAXBHandle<TrainedModel> jaxbHandle = new JAXBHandle<TrainedModel>(context);
jaxbHandle.set(trainedModel);
GenericDocumentManager docMgr = client.newDocumentManager();
docMgr.writeAs("/shivling.xml", null, jaxbHandle);
CrossValidatorModel CrossValidatorModel=createDataFrame(null);
TrainedModel TrainedModel=新的TrainedModel();
trainedModel.setModelName(“样本”);
trainedModel.SetCrossValidator模型(CrossValidator模型);
JAXBContext context=JAXBContext.newInstance(TrainedModel.class);
JAXBHandle JAXBHandle=新的JAXBHandle(上下文);
jaxbHandle.set(trainedModel);
GenericDocumentManager docMgr=client.newDocumentManager();
docMgr.writeAs(“/shivling.xml”,null,jaxbHandle);
这是我得到的xml结果
<?xml version="1.0" encoding="UTF-8"?>
<trainModel>
<modelName>sample</modelName>
<crossValidatorModel>
</crossValidatorModel>
</trainModel>
样品
crossValidatorModel在此为空,请帮助我解决此问题。NULL(在您的代码中)带有XML格式的反响:您的结果表明代码中存在语义问题
JAXB框架可以通过适当的MarkLogic Document Manager或旧的POJO方式交付:
一个简单的MarkLogic JAXB注释(您可以在批量读写事务中使用DMSDK):
代码段:
结果:
子条IO方法:
TrainedModel TrainedModel=新的TrainedModel();
trainedModel.setModelName(“历史和时事”);
训练模型(心理学);
//初始化JAXB
JAXBContext context=JAXBContext.newInstance(TrainedModel.class);
//波乔手柄
JAXBHandle writeHandle=新的JAXBHandle(上下文);
//编组
Marshaller jaxMar=context.createMarshaller();
字符串docId=“/train model.xml”;
//伊斯玛沙雷
jaxMar.marshall(培训模型,System.out);
//把手
writeHandle.set(trainedModel);
//将POJO写入MarkLogic
docMgr.write(docId,writeHandle);
感谢@Fiona Chen的回答,CrossValidatorModel不是字符串类型,因此我不能使用trainedModel.setCrossValidatorModel(“生物学”),CrossValidatorModel是org.apache.spark.ml.tuning.CrossValidatorModel给出的对象。
XMLDocumentManager docMgr = marklogic.newXMLDocumentManager();
TrainedModel trainedModel = new TrainedModel();
trainedModel.setModelName("History and Psychology");
trainedModel.setCrossValidatorModel("Biology");
String docId = "/train-model.xml";
docMgr.writeAs(docId, trainedModel);
TrainedModel trainedModel = new TrainedModel();
trainedModel.setModelName("History and Current Affairs");
trainedModel.setCrossValidatorModel("Psychology");
// initialize JAXB
JAXBContext context = JAXBContext.newInstance(TrainedModel.class);
// POJO Handle
JAXBHandle<TrainedModel> writeHandle = new JAXBHandle<TrainedModel>(context);
// Marshalling
Marshaller jaxMar = context.createMarshaller();
String docId = "/train-model.xml";
// IsMarshalled
jaxMar.marshal(trainedModel, System.out);
// set Handle
writeHandle.set(trainedModel);
// write POJO to MarkLogic
docMgr.write(docId, writeHandle);