docs: function(sql, val, callback) {
    let qry = (typeof sql === 'object') ? sql : mysql.format(sql, val);
    if (!callback && typeof val === 'function') callback = val; // Handle 2 parm scenario
  
    _pool.getConnection((err, conn) => {
      _pool.query(qry, (err, items, fields) => {
        if (err) return callback(err);
  
        conn.release();
  
        callback(err, items);
      });
    });
  }