快速添加多个配置/持久存储到核心数据

Question

您好，我按照http://commandshift.co.uk/blog/2013/06/06/multiple-persistent-stores-in-core-data/ 教程为核心数据创建了多个配置。我的一些实体在配置“SQLStorage”中，一些在“InMemory”中。

我希望 SQLStorage 配置使用NSSQLiteStoreType，而 InMemory 配置使用NSInMemoryStoreType。所以这就是我如何修改我的persistentStoreCoordinator getter。

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
        // The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
        // Create the coordinator and store
        let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
        let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
        var failureReason = "There was an error creating or loading the application's saved data."
        do {
            try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: "SQLStorage", URL: url, options: nil)
        } catch {
            // Report any error we got.
            var dict = [String: AnyObject]()
            dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
            dict[NSLocalizedFailureReasonErrorKey] = failureReason

            dict[NSUnderlyingErrorKey] = error as NSError
            let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
            // Replace this with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
            abort()
        }
        do {
            try coordinator.addPersistentStoreWithType(NSInMemoryStoreType, configuration: "InMemory", URL: url, options: nil)
        } catch {
            // Report any error we got.
            var dict = [String: AnyObject]()
            dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
            dict[NSLocalizedFailureReasonErrorKey] = failureReason

            dict[NSUnderlyingErrorKey] = error as NSError
            let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
            // Replace this with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
            abort()
        }

        return coordinator
    }()

超时我尝试编译这段代码我得到了错误：

CoreData：错误：-addPersistentStoreWithType:InMemory 配置：内存中 URL：file:///Users/developer/Library/Developer/CoreSimulator/Devices/1D943405-C5AD-4CD4-9413-070DFC5334AB/data/Containers/Data/Application/2BEAF446-6F32-405B-B2B6-6B298D45E103/Documents/SingleViewCoreData .sqlite options:(null) ... 返回错误 Error Domain=NSCocoaErrorDomain Code=134080 "(null)" UserInfo={NSUnderlyingException=无法添加 同一家商店两次} 与 userInfo 字典 { NSUnderlyingException = "不能两次添加同一个商店"; }

2016-08-16 02:25:05.181 EncryptedCoredata[9457:461607] 未解决 错误 错误域=YOUR_ERROR_DOMAIN 代码=9999 “初始化失败 应用程序保存的数据” UserInfo={NSLocalizedDescription=Failed 初始化应用程序保存的数据， NSLocalizedFailureReason=创建或加载 应用程序保存的数据。，NSUnderlyingError=0x7ff25a840ba0 {错误 域=NSCocoaErrorDomain 代码=134080 "(null)" UserInfo={NSUnderlyingException=不能两次添加同一个商店}}}, [NSLocalizedDescription：无法初始化应用程序的保存 数据，NSLocalizedFailureReason：创建或加载时出错 应用程序保存的数据。，NSUnderlyingError：错误 域=NSCocoaErrorDomain 代码=134080 "(null)" UserInfo={NSUnderlyingException=不能两次添加同一个商店}]

可能是什么问题？任何帮助，将不胜感激。提前致谢。

Answer 1

直接错误是因为您没有更改 2 个 do 块之间的 URL，因此您尝试在同一路径上添加 2 个不同的商店，这是您无法做到的。