Class: TableSaw::CreateDumpFile

Inherits:
Object
  • Object
show all
Defined in:
lib/table_saw/create_dump_file.rb

Constant Summary collapse

FORMATS = 
{
  'copy' => TableSaw::Formats::Copy,
  'insert' => TableSaw::Formats::Insert
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(records, output:, format:) ⇒ CreateDumpFile

Returns a new instance of CreateDumpFile.



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# File 'lib/table_saw/create_dump_file.rb', line 14

def initialize(records, output:, format:)
  @records = records
  @file = output
  @format = format
end

Instance Attribute Details

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/table_saw/create_dump_file.rb', line 7

def file
  @file
end

#format ⇒ Object (readonly)

Returns the value of attribute format.



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# File 'lib/table_saw/create_dump_file.rb', line 7

def format
  @format
end

#records ⇒ Object (readonly)

Returns the value of attribute records.



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# File 'lib/table_saw/create_dump_file.rb', line 7

def records
  @records
end

Instance Method Details

#call ⇒ Object

rubocop:disable Metrics/MethodLength,Metrics/AbcSize



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# File 'lib/table_saw/create_dump_file.rb', line 21

def call
  FileUtils.rm_f(file)
  FileUtils.mkdir_p(File.dirname(file))

  alter_constraints_deferrability

  write_to_file <<~SQL
    BEGIN;

    SET statement_timeout = 0;
    SET lock_timeout = 0;
    SET client_encoding = 'UTF8';
    SET standard_conforming_strings = on;
    SET check_function_bodies = false;
    SET client_min_messages = warning;

    SET search_path = public, pg_catalog;
  SQL

  records.each do |name, table|
    defer_constraints(name)

    write_to_file <<~COMMENT
      --
      -- Data for Name: #{name}; Type: TABLE DATA
      --

    COMMENT

    formatter = FORMATS.fetch(format.fetch('type', 'copy'), TableSaw::Formats::Copy).new(name, options: format)

    Array(formatter.header).each { |line| write_to_file(line) }

    TableSaw.connection_pool.with_connection do |conn|
      conn.raw_connection.copy_data "COPY (#{table.copy_statement}) TO STDOUT", formatter.coder do
        while (row = conn.raw_connection.get_copy_data)
          write_to_file formatter.dump_row(row)
        end
      end
    end

    Array(formatter.footer).each { |line| write_to_file(line) }
  end

  write_to_file 'COMMIT;'
  write_to_file "\n"

  refresh_materialized_views
  restart_sequences

  alter_constraints_deferrability keyword: 'NOT DEFERRABLE'
end