DynamoDB

Amazon DynamoDB is a fully managed NoSQL database service

provides fast and predictable performance with seamless scalability.

 DynamoDB offers encryption at rest, which eliminates the operational burden and complexity involved in protecting sensitive data.

Create database tables that can store and retrieve any amount of data, and serve any level of request traffic.

 AWS Management Console to monitor resource utilization and performance metrics.

Select DynamoDB from the services menu

Create a simple table to store data

Create a simple Guestbook table

Once you create table it will be available via ARN (Amazon Resource Number)

Need to add permissions to role to access DynamoDB

Use IAM (Identity Access Management) to add policies to existing role

IAM functionality limited but you can add policies to existing roles

Select Lambda_basic_execution 

Add inline policy

Search for Dynamo and select full access 

Select DynamoDB as a service

Configure policy for full access

Click on Review Policy

Enter a policy name and create policy

Your role now has permissions to access your DynamoDB tables

Now we can create the dynamoWrite function to put data into our table

dynamo Write

console.log('Starting Function');

const  AWS = require('aws-sdk');
const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-east-1'});

exports.handler = function(event, context, callback) {
    var params = {
        Item: {
            date: Date.now(),
            message: "I love your website!"
        },
        TableName: 'guestbook'
        };
        docClient.put(params, function(err, data){
        if (err){
            callback(err, null);
        }else{
            callback(null, data);
        }
        });
        }

Now check your dynamoDB table for the record you just created

click on the table name

Click on the record just created

Use the Date key for your Query String lookup

Create a new Lambda function Called DynamoQuery

DynamoQuery

console.log('Starting Function');

const  AWS = require('aws-sdk');

const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-east-1'});

exports.handler = function(event, context, callback) {

   

        var params = {

        TableName: 'guestbook',

        Key: {

            "date": 1550953270989

        }

        };

        docClient.get(params, function(err, data){

        if (err){

            callback(err, null);

        }else{

            callback(null, data);

        }

        });

        }