SAM Workshop > Make changes > Add a datastore

Add a datastore

Now that we have made changes to the Lambda function, let’s try to add a table to this application.

In the Cloud9 file navigation pane on the left hand side, open the api/template.yaml file.
Add the following section in the Resources section. Note: please adhere to proper identation. YAML, by design works based on indentation.
```
  ServerlessTable:
    Type: AWS::Serverless::SimpleTable
    Properties:
      Tags:
        Name: api
```
Now add the DynamoDB CRUD policy to the Lambda function. Please add the following underneath the HelloWorldFunction resource, indented to Properties.
```
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref ServerlessTable
```

Now add the table name as the environment variable

      Environment:
        Variables:
          TABLE_NAME: !Ref ServerlessTable

When you are done, your template will look like this:

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  api

  Sample SAM Template for api
     
# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 3

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs14.x
      Events:
        HelloWorld:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /hello
            Method: get
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref ServerlessTable
      Environment:
        Variables:
          TABLE_NAME: !Ref ServerlessTable

  ServerlessTable:
    Type: AWS::Serverless::SimpleTable
    Properties:
      Tags:
        Name: api


Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  HelloWorldApi:
    Description: "API Gateway endpoint URL for Prod stage for Hello World function"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"
  HelloWorldFunction:
    Description: "Hello World Lambda Function ARN"
    Value: !GetAtt HelloWorldFunction.Arn
  HelloWorldFunctionIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt HelloWorldFunctionRole.Arn

Let’s build and deploy this by running the following commands:
```
sam build
sam deploy
```
If you look at the console output, you will see the changeset having a new DynamoDB table.

Next, let’s add a row each time we hit this endpoint.