ProvisionedThroughput is used to set the read and write capacity mode. This means that in case of add, update or delete, the DynamoDBEvent, which is later used in a lambda, holds both the new values and the old values of the item. A stream is defined with StreamSpecification element in the CreateTableRequest, its StreamViewType is NEW_AND_OLD_IMAGES. They can be defined with GlobalSecondaryIndexes and LocalSecondaryIndexes elements of the CreateTableRequest. I have not used secondary indexes in the current example, but DynamoDB provides this functionality. In the case of the Actors table, along with the partition key, there is also a sort key with KeyType of RANGE which is complimentary to the HASH. In the case of the Movies table, there is only a HASH key, which is always mandatory and unique, this means no two items can have the same partition key value, the second insert overwrites the first one. KeyType has two possible values – HASH and RANGE. The attributes must also be defined in the AttributeDefinitions list. KeySchema specifies the attributes that build the primary key for a table or an index. Movies and Actors tables creation is done in separate classes with CreateTableRequest, which needs the table name. Afterward, it waits for the table to become in status ACTIVE. It checks if the table is created and if it is not, then it creates the table. AwsCredentials class extends the AWS’ abstract AWSCredentials and is used in order to manage the credentials.ĭatabaseClient class that uses and exposes just a few methods of IAmazonDynamoDB is custom created. RegionEndpoint is used to instantiate AmazonDynamoDBConfig. The concrete AWS client implementation is AmazonDynamoDBClient and an object is instantiated in DynamoDbClientFactory class and used as a singleton. The NuGet package is called AWSSDK.DynamoDBv2. The DynamoDB client interface is called IAmazonDynamoDB and comes from AWS C# SDK. In order to work with DynamoDB, a client is needed. Its values are injected from the environment variables by. In the current examples, in SqsReader project, a configuration class called AppConfig is used. In the current post, I give practical code examples of how to work with DynamoDB. The code used for this series of blog posts is located in GitHub repository. This post is part of AWS examples in C# – working with SQS, DynamoDB, Lambda, ECS series. In this section we will discuss how to get started using PocoDynamo in a real-world application using some of the best practices we learned.Post summary: Code examples with DynamoDB write and read operations. Thus improving the overall developer experience and productivity and makes working with DynamoDB, a joy! It enhances and improves AWSSDK's low-level client, with rich, native support for intuitively mapping your re-usable code-first POCO Data models into DynamoDB Data Types. NET client which extends ServiceStack's Simple POCO life by enabling re-use of your code-first data models with Amazon's industrial strength and highly-scalable NoSQL DynamoDB. We quickly found ourselves creating extensions and wrappers around the SDK to remove the low level duplicated code, mainly aimed to be more productive, until we stumbled upon a new tool, which was exactly what we have been looking for. NET DynamoDB SDK and it worked well for us. NET full-fledged and micro ORMs such as Entity Framework and Dapper with relational databases and expected the same experience with DynamoDB, our key-value and document database of choice. One of the challenges that we faced when we started building our platform a few years ago was the.
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