我想做什么？ -我想使用 DynamoDBMapper 将一批记录保存到 DynamoDB。

模型类

package model;

import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAttribute;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAutoGeneratedKey;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBDocument;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBHashKey;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBTable;

@DynamoDBTable(tableName = "jobTable")
public final class MapperModel {
    public String jobId;
    public String jobName;
    public Stringparams stringparams[];
    public String url;
    public String source;
    public String[] target;
    public String contentType;
    public String dueDate;
    public Metadata metadata;

    /** getters start here **/
    @DynamoDBHashKey(attributeName = "jobId")
    public String getJobId() {
        return jobId;
    }

    @DynamoDBAttribute(attributeName = "jobName")
    public String getJobName() {
        return jobName;
    }

    @DynamoDBAttribute(attributeName = "url")
    public String getURL() {
        return url;
    }

    @DynamoDBAttribute(attributeName = "strings")
    public Stringparams[] getStrings() {
        return stringparams;
    }


    @DynamoDBAttribute(attributeName = "source")
    public String getSource() {
        return source;
    }

    @DynamoDBAttribute(attributeName = "target")
    public String[] getTarget() {
        return target;
    }

    @DynamoDBAttribute(attributeName = "contentType")
    public String getContentType() {
        return contentType;
    }

    @DynamoDBAttribute(attributeName = "dueDate")
    public String getDueDate() {
        return dueDate;
    }

    @DynamoDBAttribute(attributeName = "metadata")
    public Metadata getMetadata() {
        return metadata;
    }

    /** setters start here **/

    public void setJobId(String string) {
        this.jobId = string;
    }

    public void setJobName(String jobName) {
        this.jobName = jobName;
    }

    public void setStrings(Stringparams[] strings) {
        this.stringparams = strings;
    }

    public void setURL(String url) {
        this.url = url;
    }

    public void setSource(String source) {
        this.source = source;
    }

    public void setTarget(String[] target) {
        this.target = target;
    }

    public void setContentType(String contentType) {
        this.contentType = contentType;
    }

    public void setDueDate(String dueDate) {
        this.dueDate = dueDate;
    }

    public void setMetadata(Metadata metadata) {
        this.metadata = metadata;
    }

    @DynamoDBDocument
    public static final class Stringparams {
        @DynamoDBAutoGeneratedKey
        public String key;
        public String value;
        public String description;

        public String getKey() {
            return key;
        }

        public void setKey(String key) {
            this.key = key;
        }

        @DynamoDBAttribute(attributeName = "value")
        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

        @DynamoDBAttribute(attributeName = "description")
        public String getDescription() {
            return description;
        }

        public void setDescription(String description) {
            this.description = description;
        }

    }

    @DynamoDBDocument
    public static final class Metadata {
        public String invoicingCategory;
        public String invoicingRegion;
        public String referenceURL;

        public void setInvoicingCategory(String invoicingCategory) {
            this.invoicingCategory = invoicingCategory;
        }

        public void setInvoicingRegion(String invoicingRegion) {
            this.invoicingRegion = invoicingRegion;
        }

        public void setReferenceURL(String referenceURL) {
            this.referenceURL = referenceURL;
        }

        @DynamoDBAttribute(attributeName = "invoicingCategory")
        public String getInvoicingCategory() {
            return invoicingCategory;
        }

        @DynamoDBAttribute(attributeName = "invoicingRegion")
        public String getInvoicingRegion() {
            return invoicingRegion;
        }

        @DynamoDBAttribute(attributeName = "referenceURL")
        public String getReferenceURL() {
            return referenceURL;
        }

    }
}

public class Test {

    ......
    .......

    public void persistRecordsToDataStore(List<MapperModel> 
                                          requestModelList) 
    {

                AmazonDynamoDB amazonDynamoDBClient = new 
                                       AmazonDynamoDBClient();
                DynamoDBMapper dynamoDBMapper = new  
                                     DynamoDBMapper(amazonDynamoDBClient);


     amazonDynamoDBClient.setRegion(Region.getRegion(Regions.US_WEST_2));

     boolean insertStatus = insertRecords(dynamoDBMapper, requestModelList)

   }     


   public static boolean insertRecords(DynamoDBMapper dynamoDBMapper,
                    List<MapperModel> requestModelList) 
   {
      for (MapperModel requestModel : requestModelList) 
      {
        dynamoDBMapper.save(requestModel);
      }

       return true;
   }

        ......
        ......
   }

问题:我看到一个错误不受支持；需要@DynamoDBTyped 或@DynamoDBTypeConverted。任何人都可以帮助我理解和分享修复程序吗？

最佳答案

使用注释 @DynamoDBDocument 有更简单的方法>

例如在上面的java类中，

@DynamoDBDocument
public class Metadata {
    private Stirng aa;
    private int bb;
}

那么它应该可以工作了

关于java - DynamoDBMapper 不工作 - 保存批记录抛出@DynamoDBTyped 或@DynamoDBTypeConverted 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41108404/