Class: TableSaw::CreateDumpFile

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(records, file = 'psql.dump') ⇒ CreateDumpFile

Returns a new instance of CreateDumpFile.



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

def initialize(records, file = 'psql.dump')
  @records = records
  @file = file
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 5

def file
  @file
end

#records ⇒ Object (readonly)

Returns the value of attribute records.



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# File 'lib/table_saw/create_dump_file.rb', line 5

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 13

def call
  File.delete(file) if File.exist?(file)

  alter_constraints_to_deferrable

  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

    write_to_file <<~SQL
      COPY #{name} (#{quoted_columns(name)}) FROM STDIN;
    SQL

    TableSaw::Connection.with do |conn|
      conn.copy_data "COPY (#{table.copy_statement}) TO STDOUT" do
        while (row = conn.get_copy_data)
          write_to_file row
        end
      end
    end

    write_to_file '\.'
    write_to_file "\n"
  end

  refresh_materialized_views
  restart_sequences

  write_to_file 'COMMIT;'
end