# File lib/memcache/pg_server.rb, line 46
    def incr(key, amount = 1)
      transaction do
        value = get(key)
        return unless value
        return unless value =~ /^\d+$/

        value = value.to_i + amount
        value = 0 if value < 0
        db.exec %{
          UPDATE #{table} SET value = #{quote(value)}, updated_at = NOW()
            WHERE key = #{quote(key)} AND #{prefix_clause}
        }
        value
      end
    end