redshift_connector is a Redshift bulk data connector for Rails (ActiveRecord).
This library is formerly called as "redshift-connector", but renamed to "redshift_connector" to follow the gem naming standard.
Add following block to your Gemfile and bundle.
gem 'redshift_connector'
Add config/initializers/redshift_connector.rb like following:
module RedshiftConnector
Exporter.default_data_source = Any_ActiveRecord_Class_Bound_To_Redshift
S3Bucket.add('primary', default: true,
region: 'YOUR_AWS_REGION_NAME',
bucket: 'YOUR_BUCKET_NAME',
prefix: 'YOUR_PREFIX',
iam_role: 'arn:aws:iam::XXXXXXXXXXXX:role/RedshiftReadOnly'
# For explicit S3 access, use following:
# aws_access_key_id: 'XXXXXXXXXXXXX',
# aws_secret_access_key: 'XXXXXXXXXXXXX'
)
end
RedshiftConnector.foreach(schema: 'app_mst', table: 'shops', query: 'select id, name from app_mst.shops') do |id, name|
p [id, name]
end
schema and table is the source table name (written in the query).
This method executes Redshift UNLOAD statement with given query and
unload result to the intermediate S3, then read contents.