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我一直在开发一个需要在运行时替换SQLite数据库文件的应用程序,我有代码来替换数据库但不更新数据库仍然显示旧数据。请指导我。在运行时替换SQLite数据库
这是获取该文件并替换
ASIHTTPRequest *requestToDownloadDB = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://www.turfnutritiontool.com/dev.ios/services/turfnutritiontool_ver_two.db"]];
// ======================================================================================================
// All methods below remove old store from coordinator
// ======================================================================================================
NSError *error = nil;
NSPersistentStore *persistentStore = [[self.persistentStoreCoordinator persistentStores] objectAtIndex:0];
[self.persistentStoreCoordinator removePersistentStore:persistentStore error:&error];
if (error) {
NSLog(@"error removing persistent store %@ %@", error, [error userInfo]);
}
// then update
//NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
//documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@"turfnutritiontool_ver_two.db"];
NSURL *applicationDocumentsDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
NSURL *storeURL = [applicationDocumentsDirectory URLByAppendingPathComponent: @"turfnutritiontool_ver_two.db"];
NSLog(@"This is store URL %@ ", storeURL);
[requestToDownloadDB setDownloadDestinationPath:[NSString stringWithString:[storeURL absoluteString]]];
[requestToDownloadDB startSynchronous];
// add clean store file back by adding a new persistent store with the same store URL
if (![self.persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:storeURL
options:nil
error:&error]) {
NSLog(@"failed to add db file, error %@, %@", error, [error userInfo]);
}
Pelase看看我的代码加入你的代码之后。
我收到
NSLog(failed to add db file, error (null), (null));
我应该现在做的
我可以直接使用NSPersistentStore类,因为它给我一个错误,抱歉,但我是新的核心数据。我需要创建NSPersistentStoreCoordinator的对象吗?请帮助我 – Retro 2012-03-20 08:13:14
我的应用程序现在不使用核心数据,只有SQlite使用db,所以我需要使用或添加核心数据功能来实现这个 – Retro 2012-03-20 08:16:04
我添加CoreData lib并创建对象?它会工作 – Retro 2012-03-20 08:29:51