johnboyer/aws-dynamodb-demo-java

Creates a sample AWS DynamoDB table, adds sample items it, and queries them.

AWS DynamoDB Demo

Overview

This project creates a sample customer table in AWS DynamoDB, adds sample items to it, and then queries them. This project is companion to my blog post: How to Build a Serverless API With AWS Dynamodb, Lambda, and API Gateway.

Prerequisites

1. An AWS Account and AWS CLI configured. Learn more here.
2. Git is installed and configured, click here for instructions.
3. Maven is installed and configured, click here for instructions.

Create DynamoDB Table and Populate It

1. Ensure that Maven is installed and configured on your computer.

2. Clone the project: $ git clone https://github.com/johnboyer/aws-dynamodb-demo-java.git

3. Review the code that creates the table and populates it with sample data:

    private static void createTable() throws InterruptedException {
        AttributeDefinition[] defs = {
    	                            new AttributeDefinition(EMAIL, S)
    	                            };
    
        ProvisionedThroughput throughput = new ProvisionedThroughput()
    	                                        .withReadCapacityUnits(1L)
    	                                        .withWriteCapacityUnits(1L);
    
        //Email address is the key
        KeySchemaElement emailKey = new KeySchemaElement(EMAIL, KeyType.HASH);
        CreateTableRequest createTableRequest = new CreateTableRequest()
    	                        .withTableName(TABLE)
                                .withKeySchema(emailKey)
                                .withAttributeDefinitions(defs)
                                .withProvisionedThroughput(throughput);
    
        // Create table if it does not exist yet
        TableUtils.createTableIfNotExists(sDynamoDB, createTableRequest);
        // wait for the table to move into ACTIVE state
        TableUtils.waitUntilActive(sDynamoDB, TABLE);
    }
            
    private static void addSampleItems() {
        // Add an item
        Map<String, AttributeValue> item = createItem("john@example.com", "John", "Doe");
        PutItemRequest putItemRequest = new PutItemRequest(TABLE, item);
        PutItemResult putItemResult = sDynamoDB.putItem(putItemRequest);
        //...
    }
   

       

4. From the aws-dynamodb-demo-java/dynamo-db directory, package the project: $ mvn package
5. Then run the app: $ mvn exec:java

For information about programming in DynamoDB click here.