The voters in every county and city shall elect an attorney for the Commonwealth unless otherwise provided by general law or special act. The attorney for the Commonwealth shall exercise all the powers conferred and perform all the duties imposed upon such officer by general law. He may perform such other duties, not inconsistent with his office, as the governing body may request. He shall be elected as provided by general law for a term of four years. Every county and city may, with the approval of the Compensation Board, provide for employing compensated assistants to the attorney for the Commonwealth as in the opinion of the Compensation Board may be required. Such assistant or assistants shall be appointed by the attorney for the Commonwealth for a term coterminous with his own. The compensation for such assistants to the attorneys for the Commonwealth shall be as provided for assistants to attorneys for the Commonwealth under § 15.2-1627.1.