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# frozen_string_literal: true
RSpec.describe ClickHouse::Client do
describe '#select' do
# Assuming we have a DB table with the following schema
#
# CREATE TABLE issues (
# `id` UInt64,
# `title` String DEFAULT '',
# `description` Nullable(String),
# `created_at` DateTime64(6, 'UTC') DEFAULT now(),
# `updated_at` DateTime64(6, 'UTC') DEFAULT now()
# )
# ENGINE = ReplacingMergeTree(updated_at)
# ORDER BY (id)
let(:query_result_fixture) { File.expand_path('../fixtures/query_result.json', __dir__) }
let(:database_config) do
{
database: 'test_db',
url: 'http://localhost:3333',
username: 'user',
password: 'pass',
variables: {
join_use_nulls: 1
}
}
end
let(:configuration) do
ClickHouse::Client::Configuration.new.tap do |config|
config.register_database(:test_db, **database_config)
config.http_post_proc = ->(_url, _headers, _query) {
body = File.read(query_result_fixture)
ClickHouse::Client::Response.new(body, 200)
}
end
end
it 'parses the results and returns the data as array of hashes' do
result = described_class.select('SELECT * FROM issues', :test_db, configuration)
timestamp1 = ActiveSupport::TimeZone["UTC"].parse('2023-06-21 13:33:44')
timestamp2 = ActiveSupport::TimeZone["UTC"].parse('2023-06-21 13:33:50')
timestamp3 = ActiveSupport::TimeZone["UTC"].parse('2023-06-21 13:33:40')
expect(result).to eq([
{
'id' => 2,
'title' => 'Title 2',
'description' => 'description',
'created_at' => timestamp1,
'updated_at' => timestamp1
},
{
'id' => 3,
'title' => 'Title 3',
'description' => nil,
'created_at' => timestamp2,
'updated_at' => timestamp2
},
{
'id' => 1,
'title' => 'Title 1',
'description' => 'description',
'created_at' => timestamp3,
'updated_at' => timestamp3
}
])
end
context 'when the DB is not configured' do
it 'raises erro' do
expect do
described_class.select('SELECT * FROM issues', :different_db, configuration)
end.to raise_error(ClickHouse::Client::ConfigurationError, /not configured/)
end
end
context 'when error response is returned' do
let(:configuration) do
ClickHouse::Client::Configuration.new.tap do |config|
config.register_database(:test_db, **database_config)
config.http_post_proc = ->(_url, _headers, _query) {
ClickHouse::Client::Response.new('some error', 404)
}
end
end
it 'raises error' do
expect do
described_class.select('SELECT * FROM issues', :test_db, configuration)
end.to raise_error(ClickHouse::Client::DatabaseError, 'some error')
end
end
end
end
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