export default class QueryBuilder {
  constructor(){ this.query={}; }
  fromJSON(q){ this.query=q; return this; }
  select(cfg){ this.query={ op:'SELECT', ...cfg }; return this; }
  insert(cfg){ this.query={ op:'INSERT', ...cfg }; return this; }
  update(cfg){ this.query={ op:'UPDATE', ...cfg }; return this; }
  delete(cfg){ this.query={ op:'DELETE', ...cfg }; return this; }
  async execute(dbClient){ return dbClient.execute(this.query); }
}