小编Mar*_*ark的帖子

我想实现一个自定义数据库初始化策略,以便我可以使用提供的用户ID和密码生成数据库模式并将其应用于EXISTING EMPTY SQL数据库.

不幸的是,内置策略没有提供我正在寻找的东西:

// The default strategy creates the DB only if it doesn't exist - but it does 
// exist so this does nothing
Database.SetInitializer(new CreateDatabaseOnlyIfNotExists<DataContext>());

// Drops and re-creates the database but then this breaks my security mapping and 
// only works if using a “Trusted" connection
Database.SetInitializer(new RecreateDatabaseIfModelChanges<DataContext>());

// Strategy for always recreating the DB every time the app is run. – no good for 
// what I want
Database.SetInitializer(new AlwaysRecreateDatabase<DataContext>());

我已经解决了以下问题,但这不会创建ModelHash,因此我无法使用"context.Database.ModelMatchesDatabase()"来验证是否已创建数据库模式并阻止多次初始化:

public class …

我们在swift中创建了一个使用钥匙串的应用程序.该应用程序在设备或模拟器上运行时工作正常,但在通过Testflight配置时无法访问钥匙串,除非配置到以前从未安装过通过Xcode 6.1安装的应用程序的新设备.

以下是钥匙串代码的摘录:

    import UIKit
    import Security

    let serviceIdentifier = "com.ourdomain"

    let kSecClassValue = kSecClass as NSString
    let kSecAttrAccountValue = kSecAttrAccount as NSString
    let kSecValueDataValue = kSecValueData as NSString
    let kSecClassGenericPasswordValue = kSecClassGenericPassword as NSString
    let kSecAttrServiceValue = kSecAttrService as NSString
    let kSecMatchLimitValue = kSecMatchLimit as NSString
    let kSecReturnDataValue = kSecReturnData as NSString
    let kSecMatchLimitOneValue = kSecMatchLimitOne as NSString

class KeychainManager {

    class func setString(value: NSString, forKey: String) {
        self.save(serviceIdentifier, key: forKey, data: value)
    }

    class func stringForKey(key: String) -> …

说我有以下代码,在记事本中嘲笑,所以原谅任何小错误:)

//Default page
public ActionResult Index()
    {
        var musicViewModel
        {
         Albums = GetTopSellingAlbums(5),
         Genres = GetTopGenres(5),
         Artists = GetTopArtists(5)
         };

        return View(musicViewModel);
    }

[HttpPost]
public ActionResult Index(MusicViewModel musicViewModel)
    {

        //For the example, pretend I have a class called musicStoreSubmission in my
        //viewmodel which holds a few different fields the user fills out.

        if(ModelState.IsValid)
        {
            //Do some actions based on the user submitting a form
        }

        //Else, refresh page with errors in Modelstate.
        var musicViewModel
        {
         Albums = GetTopSellingAlbums(5),
         Genres = …