Write data by Lambda function

Creating the Lambda Function

  1. Navigate to the AWS Lambda Console

    • Select Functions from the left navigation
    • Click Create function Lambda Console Navigation

  2. Configure the Function Settings:

    • Select Author from scratch
    • Function name: book_create
    • Runtime: Python 3.11
    • Click Create function Lambda Function Creation

  3. Implement the Function Code:

    • In the Code tab, replace the contents with:
    import boto3
import json

client = boto3.resource('dynamodb')

def lambda_handler(event, context):
    book_item = event["body"]
    error = None

    try:
        table = client.Table('Books')
        table.put_item(Item = book_item)
    except Exception as e:
        error = e

    if error is None:
        response = {
            'statusCode': 200,
            'body': 'writing to dynamoDB successfully!',
            'headers': {
                'Content-Type': 'application/json'
            },
        }
    else:
        response = {
            'statusCode': 400,
            'body': 'writing to dynamoDB fail!',
            'headers': {
                'Content-Type': 'application/json'
            },
        }

    return response
    • Click Deploy to save your changes Lambda Function Code

Configuring Permissions

  1. Set up DynamoDB Access:

    • Navigate to the Configuration tab
    • Select Permissions from the left sidebar
    • Click the execution role link Lambda Permissions

  2. Add DynamoDB Policy:

    • Click Attach permissions
    • Select Attach policies Add Policy
    • Search for and select AmazonDynamoDBFullAccess
    • Click Add permission DynamoDB Policy

Testing the Function

  1. Create a Test Event:

    • Go to the Test tab
    • Create a new test event named test_1
    • Use this sample JSON:
    {
  "body": {
      "id": "1",
      "name": "Java",
      "author": "Alex",
      "category": "IT",
      "price": "10.89",
      "description": "This book guide to create Java web basic",
      "image": "https://book-image-resize-store.s3.us-east-1.amazonaws.com/Java.jpg"
  }
}
    • Click Save, then Test Test Configuration

Verifying Data in DynamoDB

  1. Access Your DynamoDB Table:

    • Open the DynamoDB console
    • Select the Books table
    • Click Actions > Update settings DynamoDB Table Access

  2. View Table Items:

    • Select Explore table items Explore Items

  3. Review the Data:

    • Verify your test data appears in the table Table Data