Styjun

I am trying to update attributes of fields of two different tables in dynamodb via android application. After searching a lot I found this:-

dynamoDBMapper.batchSave(modelObj1, modelObj2);

This function is working correctly but in "UPDATE" configuration i.e. removing all other attributes in the field leaving only updated attributes. But I want it to be in "APPEND_SET" configuration i.e. all attributes which are not supposed to update also stays in the field.

I am successfully updating field with "SET_APPEND"
configuration when dealing with single table update (i.e. not batch) like this:-

DynamoDBMapperConfig dynamoDBMapperConfig = new DynamoDBMapperConfig.Builder()
 .withConsistentReads(DynamoDBMapperConfig.ConsistentReads.CONSISTENT)
 .withSaveBehavior(DynamoDBMapperConfig.SaveBehavior.APPEND_SET)
 .build();
dynamoDBMapper.save(newsItem, dynamoDBMapperConfig);

But this doesn't work in case of batchSave.

Here's my code:-

public class MainActivity extends AppCompatActivity 

static DynamoDBMapper dynamoDBMapper;
String userId;

@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 // AWSMobileClient enables AWS user credentials to access your table
 AWSMobileClient.getInstance().initialize(this).execute();

 AWSCredentialsProvider credentialsProvider = AWSMobileClient.getInstance().getCredentialsProvider();
 AWSConfiguration configuration = AWSMobileClient.getInstance().getConfiguration();

 // Add code to instantiate a AmazonDynamoDBClient
 AmazonDynamoDBClient dynamoDBClient = new AmazonDynamoDBClient(credentialsProvider);

 dynamoDBMapper = DynamoDBMapper.builder()
 .dynamoDBClient(dynamoDBClient)
 .awsConfiguration(configuration)
 .build();

 batchSave();


public void batchSave() 
 final UserInfoDO userInfoDO = new UserInfoDO();

 userInfoDO.setUserId(userId);
 userInfoDO.setRoomNumber(123D);

 final ComplaintTableDO complaintTableDO = new ComplaintTableDO();
 complaintTableDO.setComplaintId("1234567890");
 complaintTableDO.setUserId(userId);

 new Thread(new Runnable() 
 @Override
 public void run() 
 DynamoDBMapperConfig dynamoDBMapperConfig = new DynamoDBMapperConfig.Builder()
 .withConsistentReads(DynamoDBMapperConfig.ConsistentReads.CONSISTENT)
 .withSaveBehavior(DynamoDBMapperConfig.SaveBehavior.APPEND_SET)
 .build();
 dynamoDBMapper.batchSave(userInfoDO,complaintTableDO, dynamoDBMapperConfig);
 
 ).start();
 

This produces error:-

com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMappingException: Class class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapperConfig must be annotated with interface com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBTable
 at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBReflector.getTable(DynamoDBReflector.java:172)
 at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapperConfig$DefaultTableNameResolver.getTableName(DynamoDBMapperConfig.java:508)
 at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.internalGetTableName(DynamoDBMapper.java:809)
 at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.getTableName(DynamoDBMapper.java:790)
 at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.batchWrite(DynamoDBMapper.java:1733)
 at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.batchSave(DynamoDBMapper.java:1664)