In this blog we will discuss about Amazon DynamoDB and how to use it with Ruby on Rails application.
Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability.
NoSQL databases are designed for scale, but their architectures are sophisticated, and there can be significant operational overhead in running a large NoSQL cluster.
With DynamoDB, you can create database tables that can store and retrieve any amount of data, and serve any level of request traffic.
DynamoDB allows you to delete expired items from tables automatically to help you reduce storage usage and the cost of storing data that is no longer relevant.
Now, we will integrate it with Rails application. For this we can use aws-sdk gem.
So, in Gemfile
Run $ bundle
Now, we will configure Aws access. for this create config/initializers/aws.rb
In aws.rb
We can started by initializing a client object of DynamoDB by
Now, we can create a table
Above code will create a table in DynamoDB.
Now we have a table so, we can add items by
Update an item
Fetching the items from table
We can scan full table. scan method can be used to perform a full table scan, which by default will return every item in a table
There are many api's for querying to meet your requirement. You can get this from here.
Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability.
NoSQL databases are designed for scale, but their architectures are sophisticated, and there can be significant operational overhead in running a large NoSQL cluster.
With DynamoDB, you can create database tables that can store and retrieve any amount of data, and serve any level of request traffic.
DynamoDB allows you to delete expired items from tables automatically to help you reduce storage usage and the cost of storing data that is no longer relevant.
Now, we will integrate it with Rails application. For this we can use aws-sdk gem.
So, in Gemfile
gem 'aws-sdk', '~>2'
Run $ bundle
Now, we will configure Aws access. for this create config/initializers/aws.rb
In aws.rb
Aws.config.update({
region: 'us-west-2',
credentials: Aws::Credentials.new(
'REPLACE_WITH_ACCESS_KEY_ID',
'REPLACE_WITH_SECRET_ACCESS_KEY'),
})
We can started by initializing a client object of DynamoDB by
dynamodb = Aws::DynamoDB::Client.new
Now, we can create a table
dynamodb.create_table({
table_name: 'VenueOfferTable',
attribute_definitions: [
{attribute_name: 'Title',attribute_type:'S'},
{attribute_name: 'LongDescription', attribute_type: 'S'}
],
key_schema: [
{attribute_name: 'Title', key_type: 'HASH'},
],
provisioned_throughput: {
read_capacity_units: 1,
write_capacity_units: 1
}
})
Above code will create a table in DynamoDB.
Now we have a table so, we can add items by
dynamodb.put_item({
table_name: 'VenueOfferTable',
item: {
'Title' => 'Mill Valley Kitchen',
'LongDescription' => 'Restaurant and Bar '
}
})
Update an item
dynamodb.update_item({
table_name: 'VenueOfferTable',
key: {
'Title' => 'Mill Valley Kitchen'
},
update_expression: 'SET LongDescription = :LongDescription',
expression_attribute_values: {
':LongDescription' => 'Premium Restaurant and Bar'
}
})
Fetching the items from table
response = dynamodb.get_item({
table_name: 'VenueOfferTable',
key: {
'Title' => 'Mill Valley Kitchen'
}
})
We can scan full table. scan method can be used to perform a full table scan, which by default will return every item in a table
response = dynamodb.scan(table_name: 'VenueOfferTable') items = response.items
There are many api's for querying to meet your requirement. You can get this from here.
