Clickhouse::Activerecord
A Ruby database ActiveRecord driver for ClickHouse. Support Rails >= 7.1. Support ClickHouse version from 22.0 LTS.
Installation
Add this line to your application’s Gemfile:
ruby
gem 'clickhouse-activerecord'
And then execute:
$ bundle
Or install it yourself as:
$ gem install clickhouse-activerecord
Available database connection parameters
yml
default: &default
adapter: clickhouse
database: database
host: localhost
port: 8123
username: username
password: password
ssl: true # optional for using ssl connection
debug: true # use for showing in to log technical information
migrations_paths: db/clickhouse # optional, default: db/migrate_clickhouse
cluster_name: 'cluster_name' # optional for creating tables in cluster
replica_name: '{replica}' # replica macros name, optional for creating replicated tables
Alternatively if you wish to pass a custom Net::HTTP transport (or any other
object which supports a .post() function with the same parameters as
Net::HTTP’s), you can do this directly instead of specifying
host/port/ssl:
ruby
class ActionView < ActiveRecord::Base
establish_connection(
adapter: 'clickhouse',
database: 'database',
connection: Net::HTTP.start('http://example.org', 8123)
)
end
Usage in Rails
Add your database.yml connection information with postfix _clickhouse for you environment:
yml
development:
adapter: clickhouse
database: database
Your model example:
ruby
class Action < ActiveRecord::Base
end
For materialized view model add:
ruby
class ActionView < ActiveRecord::Base
self.is_view = true
end
Usage in Rails with second database
Add your database.yml connection information for you environment:
```yml development: primary: …
clickhouse: adapter: clickhouse database: database ```
Connection Multiple Databases with Active Record or short example:
ruby
class Action < ActiveRecord::Base
establish_connection :clickhouse
end
Rake tasks
Create / drop / purge / reset database:
$ rake db:create
$ rake db:drop
$ rake db:purge
$ rake db:reset
Or with multiple databases:
$ rake db:create:clickhouse
$ rake db:drop:clickhouse
$ rake db:purge:clickhouse
$ rake db:reset:clickhouse
Migration:
$ rails g clickhouse_migration MIGRATION_NAME COLUMNS
$ rake db:migrate
$ rake db:rollback
Dump / Load for multiple using databases
If you using multiple databases, for example: PostgreSQL, Clickhouse.
Schema dump to db/clickhouse_schema.rb file:
$ rake db:schema:dump:clickhouse
Schema load from db/clickhouse_schema.rb file:
$ rake db:schema:load:clickhouse
For export schema to PostgreSQL, you need use:
$ rake clickhouse:schema:dump -- --simple
Schema will be dump to db/clickhouse_schema_simple.rb. If default file exists, it will be auto update after migration.
Structure dump to db/clickhouse_structure.sql file:
$ rake clickhouse:structure:dump
Structure load from db/clickhouse_structure.sql file:
$ rake clickhouse:structure:load
Dump / Load for only Clickhouse database using
$ rake db:schema:dump
$ rake db:schema:load
$ rake db:structure:dump
$ rake db:structure:load
Insert and select data
```ruby Action.where(url: ‘http://example.com’, date: Date.current).where.not(name: nil).order(created_at: :desc).limit(10) # Clickhouse Action Load (10.3ms) SELECT actions.* FROM actions WHERE actions.date = ‘2017-11-29’ AND actions.url = ‘http://example.com’ AND (actions.name IS NOT NULL) ORDER BY actions.created_at DESC LIMIT 10 #=> #<ActiveRecord::Relation [#<Action *** >]>
Action.create(url: ‘http://example.com’, date: Date.yesterday) # Clickhouse Action Load (10.8ms) INSERT INTO actions (url, date) VALUES (‘http://example.com’, ‘2017-11-28’) #=> true
ActionView.maximum(:date) # Clickhouse (10.3ms) SELECT maxMerge(actions.date) FROM actions #=> ‘Wed, 29 Nov 2017’
Action.where(date: Date.current).final.limit(10) # Clickhouse Action Load (10.3ms) SELECT actions.* FROM actions FINAL WHERE actions.date = ‘2017-11-29’ LIMIT 10 #=> #<ActiveRecord::Relation [#<Action *** >]>
Action.settings(optimize_read_in_order: 1).where(date: Date.current).limit(10) # Clickhouse Action Load (10.3ms) SELECT actions.* FROM actions FINAL WHERE actions.date = ‘2017-11-29’ LIMIT 10 SETTINGS optimize_read_in_order = 1 #=> #<ActiveRecord::Relation [#<Action *** >]>
User.joins(:actions).using(:group_id) # Clickhouse User Load (10.3ms) SELECT users.* FROM users INNER JOIN actions USING group_id #=> #<ActiveRecord::Relation [#<Action *** >]> ```
Migration Data Types
Integer types are unsigned by default. Specify signed values with :unsigned =>
false. The default integer is UInt32
| Type (bit size) | Range | :limit (byte size) |
|---|---|---|
| Int8 | -128 to 127 | 1 |
| Int16 | -32768 to 32767 | 2 |
| Int32 | -2147483648 to 2,147,483,647 | 3,4 |
| Int64 | -9223372036854775808 to 9223372036854775807] | 5,6,7,8 |
| Int128 | … | 9 - 15 |
| Int256 | … | 16+ |
| UInt8 | 0 to 255 | 1 |
| UInt16 | 0 to 65,535 | 2 |
| UInt32 | 0 to 4,294,967,295 | 3,4 |
| UInt64 | 0 to 18446744073709551615 | 5,6,7,8 |
| UInt256 | 0 to … | 8+ |
| Array | … | … |
Example:
``` ruby class CreateDataItems < ActiveRecord::Migration def change create_table “data_items”, id: false, options: “VersionedCollapsingMergeTree(sign, version) PARTITION BY toYYYYMM(day) ORDER BY category”, force: :cascade do |t| t.date “day”, null: false t.string “category”, null: false t.integer “value_in”, null: false t.integer “sign”, limit: 1, unsigned: false, default: -> { “CAST(1, ‘Int8’)” }, null: false t.integer “version”, limit: 8, default: -> { “CAST(toUnixTimestamp(now()), ‘UInt64’)” }, null: false end end end
```
Using replica and cluster params in connection parameters
yml
default: &default
***
cluster_name: 'cluster_name'
replica_name: '{replica}'
ON CLUSTER cluster_name will be attach to all queries create / drop.
Engines MergeTree and all support replication engines will be replaced to Replicated***('/clickhouse/tables/cluster_name/database.table', '{replica}')
Donations
Donations to this project are going directly to PNixx, the original author of this project:
- BTC address:
1H3rhpf7WEF5JmMZ3PVFMQc7Hm29THgUfN - ETH address:
0x6F094365A70fe7836A633d2eE80A1FA9758234d5 - XMR address:
42gP71qLB5M43RuDnrQ3vSJFFxis9Kw9VMURhpx9NLQRRwNvaZRjm2TFojAMC8Fk1BQhZNKyWhoyJSn5Ak9kppgZPjE17Zh - TON address:
UQBt0-s1igIpJoEup0B1yAUkZ56rzbpruuAjNhQ26MVCaNlC
Development
After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/pnixx/clickhouse-activerecord. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
License
The gem is available as open source under the terms of the MIT License.