Class: Dbtools::Import

Inherits:
Thor
  • Object
show all
Defined in:
lib/tasks/import.rb

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Import

Returns a new instance of Import.



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# File 'lib/tasks/import.rb', line 17

def initialize(*args)
  super
  load_config
end

Instance Method Details

#convert_to_utf8(filename) ⇒ Object 



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# File 'lib/tasks/import.rb', line 38

def convert_to_utf8(filename)
  puts "Converting #{filename} to utf8"

  #filename_utf8_encoded = "#{filename}_utf8"
  #system "iconv -f utf-8 -t utf-8 -c < #{filename} > #{filename_utf8_encoded}"

  filename_tmp = filename + '.tmp'
  filename_old = filename + '.old'

  begin
    File.open(filename_tmp, 'w') do |file_out|
      File.foreach(filename) do |line_input|
        file_out.puts(line_input.encode!('UTF-8', 'UTF-8', :invalid => :replace))
      end
    end
    # Swap filenames
    File.rename(filename, filename_old)
    File.rename(filename_tmp, filename)
    File.rename(filename_old, filename_tmp)
  rescue Exception => e
    raise "Failed to convert encoding of file #{filename} to UTF-8 because #{e.message}. "
  ensure 
    File.delete(filename_tmp)
  end
end

#create_schema(csv_file, table_name) ⇒ Object 



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# File 'lib/tasks/import.rb', line 65

def create_schema(csv_file, table_name)
  csv = Dbtools::Converter::Csv_importer.new(csv_file, tablename: table_name)
  puts csv.to_sql_schema_script
end

#csv_in_postgres(csv_file, database_name, table_name) ⇒ Object 



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# File 'lib/tasks/import.rb', line 71

def csv_in_postgres(csv_file, database_name, table_name)
  # Converts file to utf8
  convert_to_utf8(csv_file)
  # Sanitize table name
  table_name = table_name.downcase.gsub(/[^0-9a-zA-Z_]/,'_')

  # Creates a table schema based on the csv.
  csv = Dbtools::Converter::Csv_importer.new(csv_file, tablename: table_name)
  csv_schema_command = csv.to_sql_schema_script
  #copy_csv_command = "\\COPY \"#{table_name}\" FROM '#{csv_file}' DELIMITER '#{csv.delimiter}' CSV HEADER;"

  #system "createdb #{@postgres_connection_options} #{database_name}"

  puts "Importing #{csv_file} into #{database_name}.#{table_name}"
  # Create the table and copy the csv contents into the table. 
  begin
    psql = Dbtools::Database::PostgresqlConnection.new("#{@postgres_connection_url}")
    psql.create_database(database_name)
    psql.close 
  # Create the database

    psql = Dbtools::Database::PostgresqlConnection.new("#{@postgres_connection_url}#{database_name}")
    psql.execute_query(csv_schema_command)
    psql.copy_from_file(csv_file, table_name, csv.delimiter)
    psql.execute_files(Dbtools::Constants::PLSQL_FUNCTIONS_DIR)
  ensure
    psql.close
  end
  return "#{@postgres_connection_url}#{database_name}"
end

#excel(database_name, file) ⇒ Object 



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# File 'lib/tasks/import.rb', line 103

def excel(database_name, file)
  folder = File.join("/tmp", database_name)
  # Convert spreadsheets to Excel. 
  files = excel2csv(file, folder)
  result = ''
  files.each do |sheet_name, csv_file|
    begin
      # Load every file in Postgres
      table_name = "#{File.basename(csv_file, File.extname(csv_file))}_#{sheet_name}"
      result = csv_in_postgres(csv_file, database_name, table_name)
    rescue Exception => e
      puts "Could not load #{csv_file} into #{database_name} because #{e.message}. "
    end
  end
  FileUtils.remove_entry_secure(folder)
  return result
end

#excel2csv(file, target_dir) ⇒ Object 



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# File 'lib/tasks/import.rb', line 122

def excel2csv(file, target_dir)
  converter = Dbtools::Converter::Excel2csv_converter.new(file)
  files = converter.output(target_dir)
  return files
end

#mysql_dump(database_name, file) ⇒ Object 



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# File 'lib/tasks/import.rb', line 31

def mysql_dump(database_name, file)
  system "#{@mysql_connection_command} -e 'CREATE DATABASE #{database_name}'"
  system "#{@mysql_connection_command} < #{file}"
  return "#{@mysql_connection_url}#{database_name}"
end

#postgres_dump(database_name, file) ⇒ Object 



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# File 'lib/tasks/import.rb', line 24

def postgres_dump(database_name, file)
  system "createdb #{@postgres_connection_options} #{database_name}"
  system "#{@postgres_connection_command} --dbname=#{database_name} --file=#{file}"
  return "#{@postgres_connection_url}#{database_name}"
end