Module: DataDumper

Defined in:
lib/data_dumper.rb,
lib/data_dumper/version.rb

Constant Summary collapse

VERSION = 
"1.0.0"

Class Method Summary collapse

Class Method Details

.dump(path) ⇒ Object 



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# File 'lib/data_dumper.rb', line 2

def self.dump(path)
  ActiveRecord::Base.connection.tables.each do |table_name|
    quoted_output_filename = ActiveRecord::Base.connection.quote(File.expand_path(File.join(path, table_name + ".sql")))
    ActiveRecord::Base.connection.execute(<<-EOSQL)
      COPY #{table_name} TO #{quoted_output_filename} WITH CSV
    EOSQL
  end
end

.load(path) ⇒ Object 



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# File 'lib/data_dumper.rb', line 11

def self.load(path)
  conn = ActiveRecord::Base.connection
  ActiveRecord::Base.transaction do
    files = Dir[File.join(path, "*.sql")]

    puts "Disabling triggers in all tables to be loaded"
    files.each do |filename|
      table_name = File.basename(filename, ".sql")
      conn.execute "ALTER TABLE #{table_name} DISABLE TRIGGER ALL"
    end

    puts "Truncating existing data"
    table_names = files.map do |filename|
      File.basename(filename, ".sql")
    end
    conn.execute "TRUNCATE #{table_names.join(", ")} CASCADE"

    puts "Loading new data from #{path.inspect}..."
    files.each do |filename|
      # Has to be absolute, since it's the server process itself which will load the data
      quoted_filename = conn.quote(File.expand_path(filename))
      table_name      = File.basename(filename, ".sql")

      puts table_name
      conn.execute "COPY #{table_name} FROM #{quoted_filename} CSV"
    end

    puts "Enabling triggers in all tables"
    files.each do |filename|
      table_name = File.basename(filename, ".sql")
      conn.execute "ALTER TABLE #{table_name} ENABLE TRIGGER ALL"
    end

  end

  puts "Analyzing the data, for best performance"
  conn.execute "ANALYZE"
end