Question

我正在运行ruby 2.3（出于sqlite3兼容性的原因）。下面的代码是产生连贯问题的最小代码段。

我在方法中有以下一行：

def pull_value(id_item_hash)
     ...
            ...
            pull = db.execute2 "Select Level from sometable where Id = :id OR Item = :item" ,id_item_hash[:id], id_item_hash[:item]
            @pull=Integer(pull) #@pull=Integer(pull[1]) DOESN'T solve the problem
            ...
     ...
end

但是，@pull返回一个Array，该TypeError会在下面的行中导致一个#here pulled = x.pull_value(id_item_hash) #so these lines never run print "subtract how much?: "; subtracting = Integer(gets.chomp) new_value = pulled - subtracting：

Label

我的问题：我如何挑出列pull中的第一个发现值，以便我的变量@IBOutlet weak var tableView: UITableView! var articles: [Article]? = [] var source = "techcrunch" override func viewDidLoad() { super.viewDidLoad() fetchArticles(fromSource: source) } func fetchArticles(fromSource provider: String){ let urlRequest = URLRequest(url: URL(string: "https://newsapi.org/v2/top-headlines?sources=\(provider)-cn&apiKey=8dc336917a8044f5ba7df7ff787a7ccb")!) let task = URLSession.shared.dataTask(with: urlRequest) { (data,response,error) in if error != nil { print(error) return } self.articles = [Article]() do { let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject] if let articlesFromJson = json["articles"] as? [[String : AnyObject]] { for articleFromJson in articlesFromJson { let article = Article() if let title = articleFromJson["title"] as? String, let author = articleFromJson["author"] as? String, let desc = articleFromJson["description"] as? String, let url = articleFromJson["url"] as? String, let urlToImage = articleFromJson["urlToImage"] as? String { article.author = author article.desc = desc article.headline = title article.url = url article.imageUrl = urlToImage } self.articles?.append(article) } } DispatchQueue.main.async { self.tableView.reloadData() } } catch let error { print(error) } } task.resume() } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "articleCell", for: indexPath) as! ArticleCell cell.title.text = self.articles?[indexPath.item].headline cell.desc.text = self.articles?[indexPath.item].desc cell.author.text = self.articles?[indexPath.item].author cell.imgView.downloadImage(from: (self.articles?[indexPath.item].imageUrl!)!) return cell } func numberOfSections(in tableView: UITableView) -> Int { return 1 } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return (self.articles?.count) ?? 0 } func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { let webVC = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "web") as! WebViewController webVC.url = self.articles?[indexPath.item].url self.present(webVC, animated: true, completion: nil) } let menuManager = MenuManager() @IBAction func menuPressed(_ sender: Any) { menuManager.openMenu() menuManager.mainVC = self }可以单独将此值保存为整数？

Answer 1

尝试一下

id = id_item_hash[:id]
item = id_item_hash[:item]
pull = db.execute2("Select Level from sometable where Id = :id OR Item = :item")

# puts pull[1][0]
@pull = pull[1][0]

从sqlite3中的数组中取整整数值

1 个答案: