我的程序沒有更新只讀核心數據sqlite數據庫的新版本

====我的解決方案==== 我解決了這個問題，將數據庫存儲在Main Bundle中並更改數據庫的名稱每次我更新應用程序。我的程序沒有更新只讀核心數據sqlite數據庫的新版本

我確實看過刷新模型等，但沒有真正得到那個工作，因爲我想。

====原來的問題====

我道歉，我已經問過這個問題，在不同的格式，但之前我一直沒能解決這個問題，可能是由於我問了這個問題。我沒有刪除舊的問題。

我有一個應用程序使用核心數據sqlite只讀數據庫，我試圖更新數據庫的新版本（版本＃inbeded）的應用程序。無論我做什麼，除了手動清理目標和重置模擬器，它仍然讀取舊數據庫。我需要能夠通過代碼來做到這一點。

在初始設計期間，我發佈了以下內容以嘗試解決相同的問題：The initial design。現在數據庫非常大，在第一次啓動時需要花費大量的時間來構建它。

的過程：

A.），我的新的數據庫版本添加到Xcode項目，並手動將其通過的Xcode

B.）我檢查添加到包是什麼版本的數據庫使用

C.）如果有一個新的數據庫，我在文件目錄中刪除舊的數據庫，然後從主束複製新版本的文檔目錄

D.）我n附加的代碼我也刪除緩存目錄並重新創建它，我發現了一些指出緩存可能是原因的帖子。這僅用於測試，但仍包含在代碼中

儘管如此，應用程序仍然無法訪問更新後的sqlite數據庫。

我有一個新的數據庫版本加載到主包中，我有一個版本參數「EEEEEE」，當我讀取當前數據庫時它有「SSSSSS」參數，所以數據庫應該更新。

我一直在處理這個問題，並在網上搜索了很長時間，我不明白什麼是錯的。爲什麼它不訪問文檔目錄中的新數據庫。

我很感激所有幫助，我可以得到。我希望代碼看起來不奇怪，因爲我已經包含了我用來試圖瞭解發生的事情的NSLog。

跟蹤（的NSLog）：

applicationDidFinishLaunchingWithOptions 

readQuestion 

persistentStoreCoordinator 

==>PARAMETER is EEEEEE (000000) 

==> Update needed 


======================= 
====BEFORE REPLACE==== 
===>CURRENT: SSSSSS: 999999 
======================= 
replaceDatabase function 
======================= 

======================= 
    DELETE CACHE 
======================= 

Remove successful 

======================= 
    CREATE NEW CACHE 
======================= 

=============================== 
REMOVE sqlite FROM DOCUMENT DIR 
=============================== 

removeItemAtPath:dbDocumentsPath: /Users/xxxxxx/Library/Application Support/iPhone Simulator/5.1/Applications/912962FC-933E-4305-971B-FF094BBD9051/Documents/database.sqlite 

===================================== 
CHECK IF sqlite EXIST IN DOCUMENT DIR 
===================================== 

===FILE DOES NOT EXIST=== 

======================================== 
MOVE sqlite FROM BUNDLE TO DOCUMENTS DIR 
======================================== 

==>copyItemAtPath:dbBundlePath<< 
==================================== 
CHECK IF sqlite EXIST IN DOCUMENT DIR 
===================================== 

===FILE EXIST=== 

readQuestion 

======================= 
=====AFTER REPLACE===== 
======================= 
Updated database is SSSSSS 

========>STOP<=========

這裏是從委託的代碼。男，「didFinishLaunchingWithOptions」：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
NSLog(@"applicationDidFinishLaunchingWithOptions"); 
NSLog(@" "); 

[window addSubview:navigationController.view]; 
[window makeKeyAndVisible]; 

//==CHECK IF DATABASE NEEDS TO BE UPDATED==// 
//====Check if database needs to be refreshed====// 


AccessQuestionsDB *refreshDB_function = [AccessQuestionsDB new]; 
qArray = [refreshDB_function readQuestion: 999999]; 
NSLog(@" "); 

//Tell what language DB 
if ([k_DBVERSION isEqualToString:@"999999"]) { 
    NSLog(@"==>PARAMETER is SSSSSS (999999)"); 
} else { 
    NSLog(@"==>PARAMETER is EEEEEE (000000)"); 
} 
NSLog(@" "); 

//==== CHECK IF DATABASE NEEDS TO BE UPDATED ====// 
if ([[qArray objectAtIndex:2] isEqualToString: k_DBVERSION]) { 
    // No update needed 
    NSLog(@"==> No update needed"); 
    NSLog(@" "); 
} 
else { 
    NSLog(@"==> Update needed"); 
    NSLog(@" "); 
    NSLog(@" "); 
    NSLog(@"======================="); 
    NSLog(@"====BEFORE REPLACE===="); 
    if ([[qArray objectAtIndex:2] isEqualToString:@"000000"]) { 
     NSLog(@"===>CURRENT: EEEEEE: %@", [qArray objectAtIndex:2]); 
    } else { 
     NSLog(@"===>CURRENT: SSSSSS: %@", [qArray objectAtIndex:2]); 
    } 

    [self replaceDatabase]; 
} 

qArray = [refreshDB_function readQuestion: 999999]; 
NSLog(@" "); 
NSLog(@" "); 
NSLog(@"======================="); 
NSLog(@"=====AFTER REPLACE====="); 
NSLog(@"======================="); 
if ([[qArray objectAtIndex:2] isEqualToString:@"000000"]) { 
    NSLog(@"Updated database is EEEEEE"); 
} else { 
    NSLog(@"Updated database is SSSSSS"); 
} 

NSLog(@" "); 
NSLog(@"========>STOP<========="); 
NSLog(@" "); 

exit(0); //>>>>STOP HERE DURING TESTING 

return YES; 
}

replaceDatabase：

- (void)replaceDatabase { 
NSLog(@"======================="); 
NSLog(@"replaceDatabase function"); 
NSLog(@"======================="); 
NSLog(@" "); 

NSFileManager *fileManager = [NSFileManager defaultManager]; 

// remove old sqlite database from documents directory 
NSURL *dbDocumentsURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"database.sqlite"]; 
NSString *dbDocumentsPath = [dbDocumentsURL path]; 

//====Cache directory testing====// 
//====This is just for testing====// 

//===============================// 
NSLog(@"======================="); 
NSLog(@" DELETE CACHE"); 
NSLog(@"======================="); 
NSLog(@" "); 
if ([fileManager removeItemAtPath: [NSHomeDirectory() stringByAppendingString:@"/Library/Caches"] error: NULL] == YES) 
    NSLog (@"Remove successful"); 
else 
    NSLog (@"Remove failed"); 

NSLog(@"======================="); 
NSLog(@" CREATE NEW CACHE"); 
NSLog(@"======================="); 
NSLog(@" ");  

[fileManager createDirectoryAtPath: [NSHomeDirectory() stringByAppendingString:@"/Library/Caches"] withIntermediateDirectories:NO attributes:nil error:nil]; 

//===============================// 
NSLog(@"==============================="); 
NSLog(@"REMOVE sqlite FROM DOCUMENT DIR"); 
NSLog(@"==============================="); 
NSLog(@" "); 


if ([fileManager fileExistsAtPath:dbDocumentsPath]) { 
    NSError *error = nil; 
    [fileManager removeItemAtPath:dbDocumentsPath error:&error]; 
    NSLog(@"removeItemAtPath:dbDocumentsPath: %@",dbDocumentsPath); 
    NSLog(@" "); 

    if (error) { 
     NSLog(@"Error deleting sqlite database: %@", [error localizedDescription]); 
    } 
} else { 
    NSLog(@"file does not ExistsAtPath:dbDocumentsPath: %@",dbDocumentsPath); 
    NSLog(@" "); 
} 


NSLog(@"====================================="); 
NSLog(@"CHECK IF sqlite EXIST IN DOCUMENT DIR"); 
NSLog(@"====================================="); 
NSLog(@" "); 
if ([fileManager fileExistsAtPath:dbDocumentsPath]) { 
    NSLog(@"===FILE EXIST==="); 
} else { 
    NSLog(@"===FILE DOES NOT EXIST==="); 
} 
NSLog(@" ");  


// move new sqlite database from bundle to documents directory 
NSLog(@"========================================"); 
NSLog(@"MOVE sqlite FROM BUNDLE TO DOCUMENTS DIR"); 
NSLog(@"========================================"); 
NSLog(@" "); 
NSString *dbBundlePath = [[NSBundle mainBundle] pathForResource:@"database" ofType:@"sqlite"]; 
if (dbBundlePath) { 
    NSError *error = nil; 
    [fileManager copyItemAtPath:dbBundlePath toPath:dbDocumentsPath error:&error]; 
    NSLog(@"==>copyItemAtPath:dbBundlePath<<"); 
    if (error) { 
     NSLog(@"Error copying sqlite database: %@", [error localizedDescription]); 
    } 
} 

NSLog(@"====================================="); 
NSLog(@"CHECK IF sqlite EXIST IN DOCUMENT DIR"); 
NSLog(@"====================================="); 
NSLog(@" "); 
if ([fileManager fileExistsAtPath:dbDocumentsPath]) { 
    NSLog(@"===FILE EXIST==="); 
} else { 
    NSLog(@"===FILE DOES NOT EXIST==="); 
} 
NSLog(@" "); 
}

persistentStoreCoordinator：

// If the coordinator doesn't already exist, it is created and the application's store added to it. 
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator { 
NSLog(@"persistentStoreCoordinator"); 

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

NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"database.sqlite"]; 
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; 
}

readQuestion：

- (NSMutableArray *)readQuestion: (int)questionNr { 

NSLog(@"readQuestion"); 

NSMutableArray *read_Question = [[NSMutableArray alloc] initWithCapacity: 0]; 

NSError *error; 
//=========PREPARE CORE DATA DB===========// 
if (managedObjectContext == nil) { managedObjectContext = [(xxxxxAppDelegate *) 
                  [[UIApplication sharedApplication] delegate] managedObjectContext]; } 
// Define qContext 
NSManagedObjectContext *qContext = [self managedObjectContext]; 
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
NSEntityDescription *entity = [NSEntityDescription 
           entityForName:@"questions" inManagedObjectContext:qContext]; 
[fetchRequest setEntity:entity]; 

NSString *qNR = [NSString stringWithFormat:@"%d", questionNr]; 

if (questionNr == 999999) { // This is the call to check if database should be updated 
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"(question = %@)", @"Hur mycket är 37532 * 3?"]; 
    [fetchRequest setPredicate: pred]; 
} 
else { 
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"(idQ = %@)", qNR]; 
    [fetchRequest setPredicate: pred]; 
} 


NSManagedObject *matches = nil; 

NSArray *objects = [qContext executeFetchRequest:fetchRequest error:&error]; 

if ([objects count] == 0) {  // If no match refresh database 
    [read_Question addObject:@"Update_DB"]; 
    [read_Question addObject:@"Update_DB"]; 
    [read_Question addObject:@"Update_DB"]; 
    [read_Question addObject:@"Update_DB"]; 
} else { 
    matches = [objects objectAtIndex:0]; 
    [read_Question addObject:[matches valueForKey:@"question"]]; 
    [read_Question addObject:[matches valueForKey:@"qRightAnswer"]]; 
    [read_Question addObject:[matches valueForKey:@"qWrongAnswer1"]]; 
    [read_Question addObject:[matches valueForKey:@"qWrongAnswer2"]]; 
} 

[fetchRequest release]; 

return [read_Question autorelease]; 
}

來源

2012-07-14 PeterK

我猜你的persistentStoreCoordinator已經緩存了舊的值，所以當你再次要求它時，它甚至不需要去商店獲取值並簡單地返回舊值。也許設置persistentStoreCoordinator爲零（也許你的managedObjectContext）將強制重新加載並解決你的問題。 – lnafziger 2012-07-16 04:22:17

嗯，有趣的問題。儘管我有一個理論。首先，如果我正確地閱讀你的代碼，你會得到一個持久性商店協調員，以便找出數據庫版本。這是創建一個引用舊的sqlite文件的持久存儲協調器。這是我不確定的部分。我懷疑由於它具有舊文件的句柄，即使您刪除它，持久性商店協調員仍然指的是舊文件協調器。你可能想要嘗試的一件事是刪除並替換sqlite文件後，刪除Persistent Store Coordinator和Managed對象上下文。此外，我會嘗試簡單地假設SQLite已過時並在初始化持久存儲協調器和託管對象上下文之前將其替換。

來源

2012-07-16 21:27:04 ACBurk

這就是我所說的。 :-) – lnafziger 2012-07-17 00:30:58

我的程序沒有更新只讀核心數據sqlite數據庫的新版本

回答

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