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 9

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 7

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 7

def records
  @records
end

Instance Method Details

#call ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/table_saw/create_dump_file.rb', line 15

def call
  write_to_file "    BEGIN;\n\n    SET session_replication_role = replica;\n    SET statement_timeout = 0;\n    SET lock_timeout = 0;\n    SET client_encoding = 'UTF8';\n    SET standard_conforming_strings = on;\n    SET check_function_bodies = false;\n    SET client_min_messages = warning;\n\n    SET search_path = public, pg_catalog;\n  SQL\n\n  records.each do |name, ids|\n    write_to_file <<~COMMENT\n      --\n      -- Data for Name: \#{name}; Type: TABLE DATA\n      --\n\n    COMMENT\n\n    write_to_file <<~SQL\n      COPY \#{name} (\#{quoted_columns(name)}) FROM STDIN;\n    SQL\n\n    TableSaw::Connection.with do |conn|\n      conn.copy_data \"COPY (select * from \#{name} where id in (\#{ids.join(',')})) TO STDOUT\" do\n        while (row = conn.get_copy_data)\n          write_to_file row\n        end\n      end\n    end\n\n    write_to_file '\\.'\n    write_to_file \"\\n\"\n  end\n\n  write_to_file 'COMMIT;'\nend\n"