Class: DBDataSource

Inherits:
Object
  • Object
show all
Defined in:
lib/source/repositories/data_sources/db_data_source.rb

Overview

Источник данных из БД

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DBDataSource

Returns a new instance of DBDataSource.



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# File 'lib/source/repositories/data_sources/db_data_source.rb', line 12

def initialize
  db_config = YAML.load_file('./LabStudents/db_config/config.example.yaml').transform_keys(&:to_sym)
  @client = Mysql2::Client.new(db_config)
  @client.query_options.merge!(symbolize_keys: true)
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/source/repositories/data_sources/db_data_source.rb', line 18

def self.instance
  return @instance if @instance

  @instance_mutex.synchronize do
    @instance ||= new
  end

  @instance
end

Instance Method Details

#prepare_exec(statement, *params) ⇒ Object 



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# File 'lib/source/repositories/data_sources/db_data_source.rb', line 28

def prepare_exec(statement, *params)
  @client.prepare(statement).execute(*params)
end

#query(statement) ⇒ Object 



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# File 'lib/source/repositories/data_sources/db_data_source.rb', line 32

def query(statement)
  @client.query(statement)
end