Class: GoodData::Datawarehouse

Inherits:
Object
  • Object
show all
Defined in:
lib/gooddata_datawarehouse/version.rb,
lib/gooddata_datawarehouse/datawarehouse.rb

Constant Summary collapse

VERSION = 
"0.0.7"
PARALEL_COPY_THREAD_COUNT = 
10

Instance Method Summary collapse

Constructor Details

#initialize(username, password, instance_id, opts = {}) ⇒ Datawarehouse

Returns a new instance of Datawarehouse.



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 13

def initialize(username, password, instance_id, opts={})
  @logger = Logger.new(STDOUT)
  @username = username
  @password = password
  @jdbc_url = "jdbc:dss://secure.gooddata.com/gdc/dss/instances/#{instance_id}"
  if @username.nil? || @password.nil? || instance_id.nil?
    fail ArgumentError, "username, password and/or instance_id are nil. All of them are mandatory."
  end

  Jdbc::DSS.load_driver
  Java.com.gooddata.dss.jdbc.driver.DssDriver
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 188

def connect
  Sequel.connect @jdbc_url,
    :username => @username,
    :password => @password do |connection|
      yield(connection)
  end
end

#create_table(name, columns, opts = {}) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 126

def create_table(name, columns, opts={})
  execute(GoodData::SQLGenerator.create_table(name, columns, opts))
end

#create_table_from_csv_header(table_name, csv_path, opts = {}) ⇒ Object

returns a list of columns created does nothing if file empty, returns []



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 119

def create_table_from_csv_header(table_name, csv_path, opts={})
  # take the header as a list of columns
  columns = get_csv_headers(csv_path)
  create_table(table_name, columns, opts) unless columns.empty?
  columns
end

#csv_to_new_table(table_name, csvs, opts = {}) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 57

def csv_to_new_table(table_name, csvs, opts={})
  csv_list = list_files(csvs)
  cols = create_table_from_csv_header(table_name, csv_list[0], opts)
  load_data_from_csv(table_name, csv_list, opts.merge(columns: cols, append: true))
end

#drop_table(table_name, opts = {}) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 53

def drop_table(table_name, opts={})
  execute(GoodData::SQLGenerator.drop_table(table_name,opts))
end

#execute(sql_strings) ⇒ Object

execute sql, return nothing



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 144

def execute(sql_strings)
  if ! sql_strings.kind_of?(Array)
    sql_strings = [sql_strings]
  end
  connect do |connection|
    sql_strings.each do |sql|
      @logger.info("Executing sql: #{sql}") if @logger
      connection.run(sql)
    end
  end
end

#execute_select(sql, opts = {}) ⇒ Object

executes sql (select), for each row, passes execution to block



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 157

def execute_select(sql, opts={})
  fetch_handler = opts[:fetch_handler]
  count = opts[:count]

  connect do |connection|
    # do the query
    f = connection.fetch(sql)

    @logger.info("Executing sql: #{sql}") if @logger
    # if handler was passed call it
    if fetch_handler
      fetch_handler.call(f)
    end

    if count
      return f.first[:count]
    end

    # if block given yield to process line by line
    if block_given?
      # go through the rows returned and call the block
      return f.each do |row|
        yield(row)
      end
    end

    # return it all at once
    f.map{|h| h}
  end
end

#export_table(table_name, csv_path) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 26

def export_table(table_name, csv_path)
  CSV.open(csv_path, 'wb', :force_quotes => true) do |csv|
    # get the names of cols
    cols = get_columns(table_name).map {|c| c[:column_name]}

    # write header
    csv << cols

    # get the keys for columns, stupid sequel
    col_keys = nil
    rows = execute_select(GoodData::SQLGenerator.select_all(table_name, limit: 1))

    col_keys = rows[0].keys

    execute_select(GoodData::SQLGenerator.select_all(table_name)) do |row|
      # go through the table write to csv
      csv << row.values_at(*col_keys)
    end
  end
  @logger.info "Table #{table_name} exported to #{csv_path.respond_to?(:path)? csv_path.path : csv_path}"
  csv_path
end

#get_columns(table_name) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 139

def get_columns(table_name)
  res = execute_select(GoodData::SQLGenerator.get_columns(table_name))
end

#init_file(given_filename, key, csv_path, single_file) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 106

def init_file(given_filename, key, csv_path, single_file)
  # only use file postfix if there are multiple files
  postfix = single_file ? '' : "-#{File.basename(csv_path)}"

  # take what we have and put the source csv name at the end
  given_filename = given_filename.path if given_filename.is_a?(File)
  f = "#{given_filename || Tempfile.new(key).path}#{postfix}"
  f = File.new(f, 'w') unless f.is_a?(File)
  f
end

#load_data_from_csv(table_name, csvs, opts = {}) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 67

def load_data_from_csv(table_name, csvs, opts={})
  thread_count = opts[:paralel_copy_thread_count] || PARALEL_COPY_THREAD_COUNT
  # get the list of files to load and columns in the csv
  csv_list = list_files(csvs)
  columns = opts[:columns] || get_csv_headers(csv_list[0])

  # truncate_table unless data should be appended
  unless opts[:append]
    truncate_table(table_name)
  end

  # load each csv from the list
  single_file = (csv_list.size == 1)
  csv_list.peach(thread_count) do |csv_path|
    if opts[:ignore_parse_errors] && opts[:exceptions_file].nil? && opts[:rejections_file].nil?
      exc = nil
      rej = nil
      opts_file = opts
    else
      opts_file = opts.clone
      # priradit do opts i do exc -
      # temporary files to get the excepted records (if not given)
      exc = opts_file[:exceptions_file] = init_file(opts_file[:exceptions_file], 'exceptions', csv_path, single_file)
      rej = opts_file[:rejections_file] = init_file(opts_file[:rejections_file], 'rejections', csv_path, single_file)
    end

    # execute the load
    execute(GoodData::SQLGenerator.load_data(table_name, csv_path, columns, opts_file))

    exc.close if exc
    rej.close if rej

    # if there was something rejected and it shouldn't be ignored, raise an error
    if ((exc && File.size?(exc)) || (rej && File.size?(rej))) && (! opts[:ignore_parse_errors])
      fail ArgumentError, "Some lines in the CSV didn't go through. Exceptions: #{IO.read(exc)}\nRejected records: #{IO.read(rej)}"
    end
  end
end

#rename_table(old_name, new_name) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 49

def rename_table(old_name, new_name)
  execute(GoodData::SQLGenerator.rename_table(old_name, new_name))
end

#table_exists?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 130

def table_exists?(name)
  count = execute_select(GoodData::SQLGenerator.get_table_count(name), :count => true)
  count > 0
end

#table_row_count(table_name) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 135

def table_row_count(table_name)
  execute_select(GoodData::SQLGenerator.get_row_count(table_name), :count => true)
end

#truncate_table(table_name) ⇒ Object 



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# File 'lib/gooddata_datawarehouse/datawarehouse.rb', line 63

def truncate_table(table_name)
  execute(GoodData::SQLGenerator.truncate_table(table_name))
end