Module: TemporalTables::ConnectionAdapters::AbstractMysqlAdapter

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

Instance Method Summary collapse

Instance Method Details

#create_temporal_triggers(table_name, primary_key) ⇒ Object

rubocop:disable Metrics/MethodLength, Metrics/AbcSize



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

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

  execute "drop trigger if exists #{table_name}_ai"
  execute %{
    create trigger #{table_name}_ai after insert on #{table_name}
    for each row
    begin
      set @current_time = utc_timestamp(6);

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

    end
  }

  execute "drop trigger if exists #{table_name}_au"
  execute %{
    create trigger #{table_name}_au after update on #{table_name}
    for each row
    begin
      set @current_time = utc_timestamp(6);

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

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

    end
  }

  execute "drop trigger if exists #{table_name}_ad"
  execute %{
    create trigger #{table_name}_ad after delete on #{table_name}
    for each row
    begin
      set @current_time = utc_timestamp(6);

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

    end
  }
end

#drop_temporal_triggers(table_name) ⇒ Object 



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

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