Module: TemporalTables::ConnectionAdapters::PostgreSQLAdapter

Defined in:
lib/temporal_tables/connection_adapters/postgresql_adapter.rb

Instance Method Summary collapse

Instance Method Details

#column_list(column_names) ⇒ Object 



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# File 'lib/temporal_tables/connection_adapters/postgresql_adapter.rb', line 78

def column_list(column_names)
  column_names.map { |c| "\"#{c}\"" }.join(', ')
end

#create_temporal_triggers(table_name, primary_key) ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/temporal_tables/connection_adapters/postgresql_adapter.rb', line 12

def create_temporal_triggers(table_name, primary_key) # rubocop:disable Metrics/MethodLength
  column_names = columns(table_name).map(&:name)

  execute %{
    create or replace function #{table_name}_ai() returns trigger as $#{table_name}_ai$
      declare
        cur_time timestamp without time zone;
      begin
        cur_time := localtimestamp;

        insert into #{temporal_name(table_name)} (#{column_list(column_names)}, eff_from)
        values (#{column_names.collect { |c| "new.#{c}" }.join(', ')}, cur_time);

        return null;
      end
    $#{table_name}_ai$ language plpgsql;

    drop trigger if exists #{table_name}_ai on #{table_name};
    create trigger #{table_name}_ai after insert on #{table_name}
    for each row execute procedure #{table_name}_ai();
  }

  execute %{
    create or replace function #{table_name}_au() returns trigger as $#{table_name}_au$
      declare
        cur_time timestamp without time zone;
      begin
        cur_time := localtimestamp;

        update #{temporal_name(table_name)} set eff_to = cur_time
        where #{primary_key} = new.#{primary_key}
          and eff_to = '#{TemporalTables::END_OF_TIME}';

        insert into #{temporal_name(table_name)} (#{column_list(column_names)}, eff_from)
        values (#{column_names.collect { |c| "new.#{c}" }.join(', ')}, cur_time);

        return null;
      end
    $#{table_name}_au$ language plpgsql;

    drop trigger if exists #{table_name}_au on #{table_name};
    create trigger #{table_name}_au after update on #{table_name}
    for each row execute procedure #{table_name}_au();
  }

  execute %{
    create or replace function #{table_name}_ad() returns trigger as $#{table_name}_ad$
      declare
        cur_time timestamp without time zone;
      begin
        cur_time := localtimestamp;

        update #{temporal_name(table_name)} set eff_to = cur_time
        where #{primary_key} = old.#{primary_key}
          and eff_to = '#{TemporalTables::END_OF_TIME}';

        return null;
      end
    $#{table_name}_ad$ language plpgsql;

    drop trigger if exists #{table_name}_ad on #{table_name};
    create trigger #{table_name}_ad after delete on #{table_name}
    for each row execute procedure #{table_name}_ad();
  }
end

#drop_temporal_triggers(table_name) ⇒ Object 



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# File 'lib/temporal_tables/connection_adapters/postgresql_adapter.rb', line 6

def drop_temporal_triggers(table_name)
  execute "drop trigger #{table_name}_ai on #{table_name}"
  execute "drop trigger #{table_name}_au on #{table_name}"
  execute "drop trigger #{table_name}_ad on #{table_name}"
end