Class: Jetel::Loaders::Pg

Inherits:
Loader
  • Object
show all
Defined in:
lib/jetel/loaders/pg/pg.rb

Instance Attribute Summary

Attributes inherited from Loader

#uri

Instance Method Summary collapse

Constructor Details

#initialize(uri) ⇒ Pg

Returns a new instance of Pg.



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# File 'lib/jetel/loaders/pg/pg.rb', line 12

def initialize(uri)
  super

  tmp = uri.split('://')
  tmp = tmp[1].split('@')

  parts = tmp[0].split(':')
  user = parts[0]
  password = parts[1]

  parts = tmp[1].split('/')
  host, port = parts[0].split(':')
  dbname = parts[1]

  opts = {
    :host => host,
    :port => port.to_i,
    # :options => '',
    # :tty => '',
    :dbname => dbname,
    :user => user,
    :password => password
  }

  @client = PG.connect(opts)
end

Instance Method Details

#load(modul, source, file, opts) ⇒ Object 



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# File 'lib/jetel/loaders/pg/pg.rb', line 39

def load(modul, source, file, opts)
  super

  convert_opts = {
    :l => opts['analyze_num_rows'] && opts['analyze_num_rows'].to_i,
    :skip => 0,
    :header => true,
    :delimiter => opts[:delimiter]
  }

  schema_list = Csv2Psql::Convert.generate_schema([file], convert_opts)
  _file_name, schema = schema_list.first

  return nil if schema.nil?

  analyzer = Csv2Psql::Analyzer.new
  column_types = (opts['column_type'] && opts['column_type'].split(/[;,]/)) || []
  column_types.each do |ct|
    name, type = ct.split('=')

    columns = schema[:columns] || []
    column = columns.find do |k, v|
      k.downcase == name
    end

    analyzer_type = analyzer.analyzers.find do |spec|
      spec[:class].name.split('::').last.downcase == type.downcase
    end

    type_val = analyzer_type ? analyzer_type[:class].const_get(:TYPE) : type

    if column
      columns[column[0]] = {
        type: type_val.to_sym,
        null: true
      }
    end
  end

  ctx = {
    :ctx => {
      :table => Helper.sanitize(source[:name]).downcase,
      :columns => schema[:columns],
      :source => source,
      :module => modul,
      :file => File.absolute_path(modul.transformed_file(source, opts)),
      :delimiter => opts[:delimiter]
    }
  }

  sql = Helper.erb_template(File.expand_path('../sql/schema.sql.erb', __FILE__), ctx)
  sql.gsub!("\n\n", "\n")
  puts sql
  @client.exec(sql)

  sql = Helper.erb_template(File.expand_path('../sql/copy.sql.erb', __FILE__), ctx)
  sql.gsub!("\n\n", "\n")
  puts sql
  @client.exec(sql)

  file = File.open(ctx[:ctx][:file], 'r')
  while !file.eof?
    # Add row to copy data
    @client.put_copy_data(file.readline)
  end

  # We are done adding copy data
  @client.put_copy_end

  # Display any error messages
  while res = @client.get_result
    e_message = res.error_message
    if e_message && !e_message.empty?
      puts e_message
    end
    puts "#{res.cmdtuples} row(s) affected"
  end

  sql
end