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# frozen_string_literal: true
module ClickHouse
module MigrationSupport
class SchemaMigration
class_attribute :table_name_prefix, instance_writer: false, default: ''
class_attribute :table_name_suffix, instance_writer: false, default: ''
class_attribute :schema_migrations_table_name, instance_accessor: false, default: 'schema_migrations'
class << self
TABLE_EXISTS_QUERY = <<~SQL.squish
SELECT 1 FROM system.tables
WHERE name = {table_name: String} AND database = {database_name: String}
SQL
def primary_key
'version'
end
def table_name
"#{table_name_prefix}#{schema_migrations_table_name}#{table_name_suffix}"
end
def table_exists?(database, configuration = ClickHouse::Migration.client_configuration)
database_name = configuration.databases[database]&.database
return false unless database_name
placeholders = { table_name: table_name, database_name: database_name }
query = ClickHouse::Client::Query.new(raw_query: TABLE_EXISTS_QUERY, placeholders: placeholders)
ClickHouse::Client.select(query, database, configuration).any?
end
def create_table(database, configuration = ClickHouse::Migration.client_configuration)
return if table_exists?(database, configuration)
query = <<~SQL
CREATE TABLE #{table_name} (
version LowCardinality(String),
active UInt8 NOT NULL DEFAULT 1,
applied_at DateTime64(6, 'UTC') NOT NULL DEFAULT now64()
)
ENGINE = ReplacingMergeTree(applied_at)
PRIMARY KEY(version)
ORDER BY (version)
SQL
ClickHouse::Client.execute(query, database, configuration)
end
def all_versions(database)
query = <<~SQL
SELECT version FROM #{table_name} FINAL
WHERE active = 1
ORDER BY (version)
SQL
ClickHouse::Client.select(query, database, ClickHouse::Migration.client_configuration).pluck('version')
end
def create!(database, **args)
insert_sql = <<~SQL
INSERT INTO #{table_name} (#{args.keys.join(',')}) VALUES (#{args.values.join(',')})
SQL
ClickHouse::Client.execute(insert_sql, database, ClickHouse::Migration.client_configuration)
end
end
end
end
end
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