使用FMDB在Swift中打开数据库

Question

我想用FMDB打开现有的数据库。数据库应该是一个sqlite数据库，其结尾为.db。

我的代码是： 静态设共享：DBManager = DBManager（）

let databaseFileName = "/mydb.db" 

var pathToDatabase: String! 

var pathNSURL: NSURL! 

var database: FMDatabase! 


override init() { 
    super.init() 

    let documentsDirectory = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString) as String 

    let zwerg = documentsDirectory + databaseFileName 

    let pathNSURL = NSURL(fileURLWithPath: zwerg) 

    let pathString = documentsDirectory + databaseFileName 

    pathToDatabase = pathNSURL.path 
    print(pathToDatabase) 
} 


func firstQuestion() -> Bool { 
    if openDatabase(){ 
     let query = "SELECT * FROM movie" 

     do { 
      let result = try database.executeQuery(query, values: nil) 
      print(result) 
     } 
     catch { 
      print(error.localizedDescription) 
     } 
     database.close() 
     return true 
    } 
    return false 
} 

func openDatabase() -> Bool { 
    if database == nil { 
     print(FileManager.default.fileExists(atPath: pathToDatabase)) 
     if FileManager.default.fileExists(atPath: pathToDatabase) { 
      print("Database set new path -> File exists") 
      database = FMDatabase(path: pathToDatabase) 
     } 
    } 

    if database != nil { 
     print("Database != nil") 
     if database.open() { 
      print("Database is open in != nil") 
      return true 
     } 
    } 

    return false 
} 

林从VC调用方法firstQuestion（）：

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    print(DBManager.shared.firstQuestion()) 
} 

我的问题是，fileExists-方法总是返回false。该文件名是正确的。这是我的第一个快速的数据库项目，所以也许我犯了一个愚蠢的错误......任何建议？

感谢您的帮助！

Answer 1

let fileManager = FileManager.default 
let docURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first! 

let databaseURL = docURL.appendingPathComponent("databaseNaeme.db") 

和初始化数据库：

database = FMDatabase(path: databaseURL.absoluteString)