async runQuery(queryString = "") {
    const result = { rows: [], count: 0, error: null };
    try {
      if (!this.#connected) await this.connect();

      const query = await this._client.query(queryString);
      result.rows = query.recordset;
      result.count = query.rowsAffected.reduce((sum, a) => sum + a, 0);
    } catch (err) {
      console.log(this.constructor.name, err);
      result.error = err.message;
    } finally {
      await this._client.close();
      this.#connected = false;
    }
    return result;
  }
@param {string} queryString the SQL query to be run
@returns {import(".").QueryResult}