Swift

Question

我正在尝试在我的物理 iPhone 的构建中包含一个预填充的 SQLite 数据库（带有 FMDB 包装器）。但是，预填充的数据库未包含在物理设备的构建中。

请注意，它在 IOS 模拟器中运行良好，但仅适用于一台模拟器设备。

我已将数据库包含在构建阶段 > 复制捆绑资源中，并在 Link 带库的二进制文件下链接 libsqlite3.dylib。

我需要添加哪些 Swift 代码才能将构建中包含的数据库获取到物理设备？

代码：

import UIKit

class ViewController: UIViewController {


    @IBOutlet weak var checkButton: UIButton!
    @IBOutlet weak var tests_scroller: UITextView!

    var databasePath = NSString()

    override func viewDidLoad() {
        super.viewDidLoad()

        checkButton.setTitle("\u{2610}", forState: .Normal)
        checkButton.setTitle("\u{2611}", forState: .Selected)


        let filemgr = NSFileManager.defaultManager()

        let dirPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)

        let docsDir = dirPaths[0] as! String

        databasePath = docsDir.stringByAppendingPathComponent("vmd_db.db")

        let myDatabase = FMDatabase(path: databasePath as String)


        if myDatabase.open(){

            var arrayData:[String] = []

            let query_lab_test = "SELECT lab_test FROM lab_test ORDER BY lab_test ASC"

            let results_lab_test:FMResultSet? = myDatabase.executeQuery(query_lab_test, withArgumentsInArray: nil)

            while results_lab_test?.next() == true {

                if let resultString = results_lab_test?.stringForColumn("lab_test"){

                arrayData.append(resultString)

            }
        }
            var multiLineString = join("\n", arrayData)
            tests_scroller.text = multiLineString
            myDatabase.close()
    }
    }




    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

更新 - 工作 Swift 2 XCode 中的代码 7 - 使用复制到物理设备的 FMDB 包装器预填充 SQLite 数据库 OK:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var tests_scroller: UITextView!

    var databasePath = NSString()

    override func viewDidLoad() {
        super.viewDidLoad()


        let sourcePath = NSBundle.mainBundle().pathForResource("vmd_db", ofType: "db")

        let documentDirectoryPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String!

        let destinationPath = (documentDirectoryPath as NSString).stringByAppendingPathComponent("vmd_db.db")

        do {                                
            try NSFileManager().copyItemAtPath(sourcePath!, toPath: destinationPath)

        } catch _ {                
        }

        //read it
        let myDatabase = FMDatabase(path: destinationPath as String)

        if myDatabase.open(){

            var arrayData:[String] = []

            let query_lab_test = "SELECT lab_test FROM lab_test ORDER BY lab_test ASC"

            let results_lab_test:FMResultSet? = myDatabase.executeQuery(query_lab_test, withArgumentsInArray: nil)

            while results_lab_test?.next() == true {

                if let resultString = results_lab_test?.stringForColumn("lab_test"){

                    arrayData.append(resultString)

                }
            }

            let multiLineString = arrayData.joinWithSeparator("\n")

            tests_scroller.text = multiLineString
            myDatabase.close()
        }
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

Answer 1

据我所知，它不应该在任何模拟器/设备上运行，因为您访问的是文档文件夹中的文件。那不在你的包里。

您需要做的是将文件从捆绑包复制到文档目录，然后再尝试在那里打开它：

//path in documents
let dirPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let docsDir = dirPaths[0]
databasePath = docsDir.stringByAppendingPathComponent("vmd_db.db")

//if not there, copy from bundle
if !filemgr.fileExistsAtPath(databasePath) {
    let bundleDatabasePath = NSBundle.mainBundle().pathForResource("vm_db", ofType: "db")
    filemgr.copyItemAtPath(bundleDatabasePath, toPath: databasePath)
}

//read it
let myDatabase = FMDatabase(path: databasePath as String)

Answer 2

我遇到了类似的问题；具体来说，在将数据添加到我在 iPhone 模拟器中使用的应用程序之后，我不想再将所有这些数据添加到我的物理 iPhone 设备中。在查看了 IlludimPu36 和 Daij-Djan 提供的解决方案后，我想到了以下方法，我在 App Delegate 的 (AppDelegate.swift) application(didFinishLaunchingWithOptions) 方法的第一行中调用了该方法：

func copyBundledSQLiteDB() {
    let sourcePath = NSBundle.mainBundle().pathForResource("filename", ofType: "sqlite")

    let documentDirectoryPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String!

    let destinationPath = (documentDirectoryPath as NSString).stringByAppendingPathComponent("filename.sqlite")

    // If file does not exist in the Documents directory already,
    // then copy it from the bundle.
    if !NSFileManager().fileExistsAtPath(destinationPath) {
        do {
            try NSFileManager().copyItemAtPath(sourcePath!, toPath: destinationPath)

        } catch _ {
        }
    }
}

它似乎有效，并且在调试器中逐步执行方法的每一行看起来 error-free 对于每种情况，当数据库不存在时（即，在删除应用程序后重新安装之后）或重置模拟器），以及数据库是否已经存在。我在物理设备上也得到了相同的结果。

感谢@IlludiumPu36 和@Daij-Djan为此提供tips/answers，我希望这可以帮助其他人。

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