Swift - 设备上不包含预填充的 SQLite 数据库

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，但仅适用于一个模拟器设备。

我已将数据库包含在 Build Phases > Copy Bundled Resources 中，并在 Link Binary with Libraries 下链接了 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 - 在 XCode 7 中使用 Swift 2 代码 - 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。那不在您的 bundle 中。

您需要做的是将文件从 bundle 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)