iOS 如何优化数据库 Parse swift 4 的查询

Posted 2023-03-10

【中文标题】iOS 如何优化数据库 Parse swift 4 的查询

【英文标题】：iOS How to optimized querys for data base Parse swift 4

【发布时间】：2018-10-02 06:03:44

【问题描述】：

我有一个问题，如果在较短的时间内我有连接到解析服务器的搜索模块。

在这个数据库中，我有超过 50 个数据表，我在其中存储了一些数据，并且我使用以下代码进行搜索：

 func searchBarSearchButtonClicked(_ searchBar: UISearchBar) 
    searchBar.resignFirstResponder()
    searchResult.removeAll(keepingCapacity: false)
    answer.removeAll(keepingCapacity: false)
    tableView.reloadData()

    let firstQuery = PFQuery(className: "table1")
    firstQuery.whereKey("question", contains: searchBar.text)

    let seccondQuery = PFQuery(className: "table2")
    seccondQuery.whereKey("question", contains: searchBar.text)

    let query3 = PFQuery(className: "table3")
    query3.whereKey("question", contains: searchBar.text)

    let query4 = PFQuery(className: "table4")
    query4.whereKey("question", contains: searchBar.text)

    let queryArry = [firstQuery, seccondQuery, query3, query4]
    for query in queryArry 
        query.findObjectsInBackground  (result, error) in
            if let objects = result 
                for object in objects 
                    let question = object.object(forKey: "question") as! String
                    let answer = object.object(forKey: "answer1") as! String
                    self.answer.append(answer)
                    self.searchResult.append(question)

                

                DispatchQueue.main.async 
                    self.tableView.reloadData()
                    self.resignFirstResponder()
                
            
        

    

如您所见，我有 4 个查询，以及一些我想要改进的方法，因为每次我都不想复制这部分代码：

let firstQuery = PFQuery(className: "table1")
firstQuery.whereKey("question", contains: searchBar.text)

也许有些人认为它有改进的可能？

【参考方案1】：

如果你不想复制这部分代码

let firstQuery = PFQuery(className: "table1")
firstQuery.whereKey("question", contains: searchBar.text)

你可以这样做：

let query1 = PFQuery(className: "table1")
let query2 = PFQuery(className: "table2")
let query3 = PFQuery(className: "table3")
let query4 = PFQuery(className: "table4")
let queries = [query1, query2, query3, query4]

queries.forEach  $0.whereKey("question", contains: searchBar.text) 
queries.forEach  (query) in
    query.findObjectsInBackground()

代码看起来更紧凑

希望我的回答对你有帮助?