Step 1: Create a Table - Amazon DynamoDB

Step 1: Create a Table

In this step, you create a table named Movies in Amazon DynamoDB. The primary key for the table is composed of the following two attributes:

  • year – The partition key. The attribute_type is N for number. 

  • title – The sort key. The attribute_type is S for string.

  1. Copy the following program and paste it into a file named MoviesCreateTable.rb.

    require 'aws-sdk-dynamodb' def create_table(dynamodb_client, table_definition) response = dynamodb_client.create_table(table_definition) response.table_description.table_status rescue StandardError => e puts "Error creating table: #{e.message}" 'Error' end def run_me region = 'us-west-2' # To use the downloadable version of Amazon DynamoDB, # uncomment the endpoint statement. Aws.config.update( # endpoint: 'http://localhost:8000', region: region ) dynamodb_client = table_definition = { table_name: 'Movies', key_schema: [ { attribute_name: 'year', key_type: 'HASH' # Partition key. }, { attribute_name: 'title', key_type: 'RANGE' # Sort key. } ], attribute_definitions: [ { attribute_name: 'year', attribute_type: 'N' }, { attribute_name: 'title', attribute_type: 'S' } ], provisioned_throughput: { read_capacity_units: 10, write_capacity_units: 10 } } puts "Creating the table named 'Movies'..." create_table_result = create_table(dynamodb_client, table_definition) if create_table_result == 'Error' puts 'Table not created.' else puts "Table created with status '#{create_table_result}'." end end run_me if $PROGRAM_NAME == __FILE__
    • You set the endpoint to indicate that you are creating the table in the downloadable version of Amazon DynamoDB on your computer.

    • In the create_table call, you specify table name, primary key attributes, and its data types.

    • The provisioned_throughput parameter is required. However, the downloadable version of DynamoDB ignores it. (Provisioned throughput is beyond the scope of this exercise.)

  2. To run the program, enter the following command.

    ruby MoviesCreateTable.rb

To learn more about managing tables, see Working with Tables and Data in DynamoDB.