postgresql_version

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 926
        def postgresql_version
          @postgresql_version ||=
            if @connection.respond_to?(:server_version)
              @connection.server_version
            else
              # Mimic PGconn.server_version behavior
              begin
                query('SELECT version()')[0][0] =~ /PostgreSQL (\d+)\.(\d+)\.(\d+)/
                ($1.to_i * 10000) + ($2.to_i * 100) + $3.to_i
              rescue
                0
              end
            end
        end