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Questions tagged [dynamodb-mapper]

42 questions
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1 answer

What is the difference between DynamoDBMapper and Table for DynamoDB Tables

In AWS DynamoDB, There are two options available to do the CRUD operations on the Table. DynamoDBMapper : com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;. AmazonDynamoDB dbClient =…
Lenzman
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i was getting this error "not supported; requires @DynamoDBTyped or @DynamoDBTypeConverted" when i tried to run the below code

when i tried to run the code using put on this entity. i was getting the error as @DynamoDBTyped or @DynamoDBTypeConverted but i can retrieve the data from the databse using get and delete without any issue, i think the issue is something with the…
sai chand
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How to create a size condition useing AWS dynamodb-mapper-js

I am trying to use the AWS Dynamodb Mapper library with Typescript to update an item in a table depending on the size of an array element (lets call it IDs) of the table. An issue in the Github repo has been raised for this: According to the…
Shafique Jamal
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DynamoDBMapper on a table containing multiple Java types

I have a single DynamoDB table which contains more than one type of Logical Entity. My table stores "Employees" and "Organizations" and creates a many-to-many relationship between the two of them. I am struggling with how to use DynamoDBMapper to…
Duke Silver
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Does dynamodb supports atomic counter on SET operation if value is not exists?

I have a use case where I need to store how many people view the blog post in DynamoDB. Lets' say I have a table like below blogId Total Views. 1 100 Now when a user views a new blog with ID 2 I have to store that in the table. I can do…
Hari
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What does the UPDATE config for the DynamoDBMapper imply?

According to the DynamoDBMapper documentation in the AWS Java SDK, the save method of the DynamoDBMapper class, takes a config (of DynamoDBMapperConfig type) as one of the inputs. In the documentation (link) the following has been provided as the…
Aditya
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Is there a way to update a nested attribute in DynamoDB using DynamoDB Mapper

I have a DynamoDB Schema with nested attributes. Hence lets say below is my mapper structure. public class Test { @DynamoDBHashKey private String testPk; @DynamoDBRangeKey private String testSk; @DynamoDBAttribute private String…
Radioactive
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How to get one Item by searching from non-key attribute in DynamoDB?

I have a table in DynamoDB and have partition key and a sort key. For example, the table structure is as follows. // Primary Keys id -> PK name -> SK Info -> json Formatted Attributes So let's say there are two items in the table, // Item 1 { …
Abraham Arnold
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DynamoDBTypeConverter not working as expected

First, the code that runs correctly: The content in DynamoDB table is : "test_field" : "x:x:x" Entity POJO has: @DynamoDBTypeConverted(converter = SingleFieldConverter.class) @DynamoDBAttribute(attributeName = "test_field") private SingleField…
bobjan
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Apply different AttributeTransformers for tables involved in DynamoDB transaction

Is there any way to use different AttributeTransformers for various tables involved in a ddb transaction. I looked at DynamoDBMapper code, it looks like the same transformers are applied to all the operations. Is there any ready-made solution to use…
Rohit Lakhotia
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DynamoDBMapper updateItem expression

I'm using DynamoDBMapper as an abstraction over dynamodb operations in java. I need to perform an update item within a transaction that depends on the current value (i.e. I need to decrement an account balance). While I know how to do this with the…
Connor Butch
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Polling items from DynamoDB

AWS newbie here. I have a DynamoDB table and 2+ nodes of Java apps reading/writing from/to it. My use case is as follow: the app should fetch N numbers of items every X seconds based on a timestamp, process them, then remove them from the DB.…
Kamil Kozlowski
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DynamoDBTypeConvertedJson for an abstract class

Say my classes are structured as follows: abstract class A { } class B extends A { String attOfB; } class C extends A { String attOfC; } Then, can my DynamoDB mapper class use A with…
Vegan Vegeta
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Quarkus and DynamoDBMapper - Failing to build a native executable - Error Random/SplittableRandom

I've got a Quarkus project where DynamoDBMapper is also being used. Everything runs perfectly in dev mode. But when running this command mvn package -Pnative -pl my-module -DskipTests it gives me this error [my-module-1.0-SNAPSHOT-runner:61] …
bob
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Best method to Batch Update existing DynamoDb items using DynamoDb mapper

I am trying to find the best way to batch update items in a DynamoDb table using Java’s Dynamo db mapper. Is DynamoDBSaveExpression the right way to do it? Can I use DynamoDBSaveExpression to batch update (batchSave()) items based on a condition or…
Samarth
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