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DynamoDB Cookbook

DynamoDB Cookbook

By : Deshpande
3.9 (8)
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DynamoDB Cookbook

DynamoDB Cookbook

3.9 (8)
By: Deshpande

Overview of this book

AWS DynamoDB is an excellent example of a production-ready NoSQL database. In recent years, DynamoDB has been able to attract many customers because of its features like high-availability, reliability and infinite scalability. DynamoDB can be easily integrated with massive data crunching tools like Hadoop /EMR, which is an essential part of this data-driven world and hence it is widely accepted. The cost and time-efficient design makes DynamoDB stand out amongst its peers. The design of DynamoDB is so neat and clean that it has inspired many NoSQL databases to simply follow it. This book will get your hands on some engineering best practices DynamoDB engineers use, which can be used in your day-to-day life to build robust and scalable applications. You will start by operating with DynamoDB tables and learn to manipulate items and manage indexes. You will also discover how to easily integrate applications with other AWS services like EMR, S3, CloudSearch, RedShift etc. A couple of chapters talk in detail about how to use DynamoDB as a backend database and hosting it on AWS ElasticBean. This book will also focus on security measures of DynamoDB as well by providing techniques on data encryption, masking etc. By the end of the book you’ll be adroit in designing web and mobile applications using DynamoDB and host it on cloud.
Table of Contents (12 chapters)
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11
Index

Setting up AWS Command Line Interface for DynamoDB

The AWS Command Line Interface allows us to operate various AWS resources from the command line itself. In this recipe, we are going to see how to use these and perform operations.

Getting ready

You can download the installer for Windows, Mac, or Linux from http://aws.amazon.com/cli/.

How to do it…

The AWS CLI for DynamoDB supports various commands, such as batch-get-item, batch-write-item, create-table, delete-item, delete-table, describe-table, get-item, list-tables, put-item, query, scan, update-item, update-table, wait, and so on.

To get started, we need to first configure the AWS CLI:

  1. Start Command Prompt, and type the following command:
    aws configure
    
  2. This will ask you for the Access Key, Secret Key, and Region details. If you have not downloaded the AWS keys yet, you can download them from https://console.aws.amazon.com/iam/home?#security_credential.
  3. Here, you can download the Access Keys and save it in a secure place. Once the keys are submitted, you can start accessing DynamoDB from the command line.
  4. We need to list the tables that we have already created, and then we can execute this command:
    aws dynamodb list-tables
    

    The output of the following command is shown below:

    How to do it…
  5. We can also run the Query operations from the command line as well. Suppose that we want to Query a product table for id =5, then we have to write this condition in the JSON document and save it on our machine. The JSON file would like this:
    {"id": {"AttributeValueList": [{"S":"5"}],"ComparisonOperator": "EQ" }}

    Assume that we saved it in a file named conditions.json; then, to execute the query, we have to run the following command:

    aws dynamodb query --table-name product --key-conditions file://conditions.json
    

    The output would be something like this:

    How to do it…

    We can also specify conditions for the Range Key in order to narrow down our results, which is similar to what we did for the Hash Key.

How it works…

The AWS CLI, which is internally called DynamoDB APIs, is used to retrieve results. For authentication, it uses the Access Key and Secret Key that you provide at the time of configuration.

There's more…

You can also try out various other options from the AWS CLI for DynamoDB, which are available at http://docs.aws.amazon.com/cli/latest/reference/dynamodb/index.html#cli-aws-dynamodb.

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