sqlite 文件不填充 tableView - 虽然它适用于简单数据 - ？ （sqlite、核心数据、预填充数据）

Question

我有一个预先填充好的 sqlite 文件，我将它复制到我的项目中（在文件夹中，然后到 xcode 项目窗口中）

当我使用终端检查 sqlite 文件时，它工作正常，我的 sqlite 文件中包含正确的数据。

然后我尝试用 sqlite 文件中的数据填充我的 tableView，但 tableView 仍然是空的。

你能告诉我我应该看哪里吗？

我首先尝试了一些数据并且它可以工作（在 applicationDidFinish 中注释了什么...），但是对于我的 sqlite 文件，它不起作用：

这是我的代码：（这是教程网址：http://www.raywenderlich.com/980/core-data-tutorial-how-to-preloadimport-existing-data）

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    NSManagedObjectContext *context = [self managedObjectContext];

    /*
    THIS WORKS :
    FailedBankInfo *failedBankInfo = [NSEntityDescription insertNewObjectForEntityForName:@"FailedBankInfo" 
                                                                   inManagedObjectContext:context];
    failedBankInfo.name = @"the name";
    failedBankInfo.city = @"the city";
    failedBankInfo.state = @"the state";

    FailedBankDetails *failedBankDetails = [NSEntityDescription insertNewObjectForEntityForName:@"FailedBankDetails"
                                                                         inManagedObjectContext:context];

    failedBankDetails.closeDate = [NSDate date];
    failedBankDetails.updatedDate = [NSDate date];
    failedBankDetails.zip = [NSNumber numberWithInt:12345];

    failedBankInfo.details = failedBankDetails;
    failedBankDetails.info = failedBankInfo;

    NSError *error;
    if (![context save:&error]){
        NSLog(@"%@,", [error localizedDescription]);
    }

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"FailedBankInfo" 
                                              inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    for (FailedBankInfo *info in fetchedObjects){
        NSLog(@"name : %@", info.name);
        FailedBankDetails *details = info.details;
        NSLog(@"zip : %@", details.zip);
    }
    [fetchRequest release];*/

    FailedBanksListViewController *root = (FailedBanksListViewController *)[_navController topViewController];
    root.context = [self managedObjectContext];
    [window addSubview:_navController.view];

    [self.window makeKeyAndVisible];

    return YES;
}

/** Returns the persistent store coordinator for the application.
 If the coordinator doesn't already exist, it is created and the application's store added to it.
 */
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {

    if (persistentStoreCoordinator_ != nil) {
        return persistentStoreCoordinator_;
    }

    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"FailedBanksCD.sqlite"];
    /*NSString *storePath = [[self applicationDocumentsDirectory] 
                           stringByAppendingPathComponent: @"FailedBanksCD.sqlite"];
    */
     //NSURL *storeURL = [NSURL fileURLWithPath:storePath];

    // Put down default db if it doesn't already exist
    NSString *storePath = [NSString stringWithFormat:@"%@", storeURL];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if (![fileManager fileExistsAtPath:storePath]) {
        NSString *defaultStorePath = [[NSBundle mainBundle] 
                                      pathForResource:@"FailedBanksCD" ofType:@"sqlite"];
        if (defaultStorePath) {
            [fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL];
        }
    }
    NSError *error = nil;
    persistentStoreCoordinator_ = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![persistentStoreCoordinator_ addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    

    return persistentStoreCoordinator_;
}

非常感谢

Answer 1

在我看来，数据库似乎没有复制到 doc-dir。你能移动这部分吗

if (persistentStoreCoordinator_ != nil) {
    return persistentStoreCoordinator_;
}

在这个 if 块之外：

if (![fileManager fileExistsAtPath:storePath]) {
    ...
}

您必须在重试之前从 doc-dir 中删除当前的空 DB（在模拟器中删除，从设备中删除应用程序并重新安装）。