在運行時替換SQLite數據庫

我一直在開發一個需要在運行時替換SQLite數據庫文件的應用程序，我有代碼來替換數據庫但不更新數據庫仍然顯示舊數據。請指導我。在運行時替換SQLite數據庫

這是獲取該文件並替換

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看看我的代碼加入你的代碼之後。

我收到

NSLog(failed to add db file, error (null), (null));

我應該現在做的

來源

2012-03-20 Retro

，你必須首先刪除舊店：

// 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 
NSURL *applicationDocumentsDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; 
NSURL *storeURL = [applicationDocumentsDirectory URLByAppendingPathComponent: @"%xyz_ver_three.db"]; 

// 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]); 
}

這應該做的伎倆...

來源

2012-03-20 07:20:31 pkyeck

我可以直接使用NSPersistentStore類，因爲它給我一個錯誤，抱歉，但我是新的核心數據。我需要創建NSPersistentStoreCoordinator的對象嗎？請幫助我 – Retro 2012-03-20 08:13:14

我的應用程序現在不使用核心數據，只有SQlite使用db，所以我需要使用或添加核心數據功能來實現這個 – Retro 2012-03-20 08:16:04

我添加CoreData lib並創建對象？它會工作 – Retro 2012-03-20 08:29:51

我對類似問題的解決方案只是用數據庫刪除文件：

[[NSFileManager defaultManager] removeItemAtURL:storeURL error:&error];

來源

2012-07-27 14:02:24 JRV

在運行時替換SQLite數據庫

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