【发布时间】：2011-04-25 17:40:15
【问题描述】：
首先，我想就这个问题启动多个线程表示歉意，但我已经采取了逐步的方法和步骤来解决这个非常恼人的问题。我已经花了四天的时间来尝试解决这个问题。
情况：我有一个应用程序，我通过 Core Data 使用预填充的 sqlite 数据库 (106k)。我已将 sqlite DB 移动到 Resources 文件夹并能够将其复制到文档中。当我测试时，我可以看到该文件存在，请参见下面的代码示例和 NSLog。
我在委托中使用了示例代码，见下文。
一切都在模拟器中完美运行，但当我在设备上测试时却不行。
这是来自委托的代码：
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (persistentStoreCoordinator_ != nil) {
return persistentStoreCoordinator_;
}
NSString *storePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"FamQuiz_R0_1.sqlite"];
/*
Set up the store.
For the sake of illustration, provide a pre-populated default store.
*/
NSFileManager *fileManager = [NSFileManager defaultManager];
// If the expected store doesn't exist, copy the default store.
if (![fileManager fileExistsAtPath:storePath]) {
NSString *defaultStorePath = [[NSBundle mainBundle] pathForResource:@"FamQuiz_R0_1" ofType:@"sqlite"];
if (defaultStorePath) {
[fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL];
}
}
NSURL *storeUrl = [NSURL fileURLWithPath:storePath];
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
persistentStoreCoordinator_ = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
NSError *error;
if (![persistentStoreCoordinator_ addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {
// Update to handle the error appropriately.
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
exit(-1); // Fail
}
return persistentStoreCoordinator_;
}
这是我读取数据库时的代码：
- (void)createQuestionsList: (NSMutableArray *)diffArray {
NSLog(@">>createQuestionsList<<");
NSFileManager *filemgr = [NSFileManager defaultManager];
NSString *docsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filePath = [docsDirectory stringByAppendingPathComponent:@"FamQuiz_R0_1.sqlite"];
if ([filemgr fileExistsAtPath: filePath ] == YES)
NSLog (@"\n\n\nFile exists in createQuestionList\n\n\n");
else
NSLog (@"\n\n\nFile not foundin createQuestionList\n\n\n");
int nrOfQuestions = [[diffArray objectAtIndex:0]intValue];
int nrOfEasyPlayers = [[diffArray objectAtIndex:1]intValue];
int nrOfMediumPlayers = [[diffArray objectAtIndex:2]intValue];
int nrOfHardPlayers = [[diffArray objectAtIndex:3]intValue];
int nrOfPlayers = nrOfEasyPlayers + nrOfMediumPlayers + nrOfHardPlayers;
allHardArrayQ = [[NSMutableArray alloc]init];
allMediumArrayQ = [[NSMutableArray alloc]init];
allEasyArrayQ = [[NSMutableArray alloc]init];
allDummyQ = [[NSMutableArray alloc]init];
allJointQ = [[NSMutableArray alloc]init];
hardQ = [[NSMutableArray alloc]init];
mediumQ = [[NSMutableArray alloc]init];
easyQ = [[NSMutableArray alloc]init];
masterQuestionsArray = [[NSMutableArray alloc] initWithObjects:
[NSNumber numberWithBool:[[diffArray objectAtIndex:4]boolValue]],
[NSNumber numberWithInt:nrOfHardPlayers],
[NSNumber numberWithInt:nrOfMediumPlayers],
[NSNumber numberWithInt:nrOfEasyPlayers],
[NSNumber numberWithInt:nrOfQuestions],
nil];
NSLog(@"masterQuestionsArray %@", masterQuestionsArray);
NSError *error;
//=========PREPARE CORE DATA DB===========//
if (managedObjectContext == nil) { managedObjectContext = [(FamQuiz_R0_1AppDelegate *)
[[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];
NSArray *fetchedObjects = [qContext executeFetchRequest:fetchRequest error:&error];
for (NSManagedObject *info in fetchedObjects) {
if ([[info valueForKey:@"qDiff"] intValue] == 1) {
[allEasyArrayQ addObject:[info valueForKey:@"idQ"]];
} else if ([[info valueForKey:@"qDiff"] intValue] == 2) {
[allMediumArrayQ addObject:[info valueForKey:@"idQ"]];
} else if ([[info valueForKey:@"qDiff"] intValue] == 3) {
[allHardArrayQ addObject:[info valueForKey:@"idQ"]];
}
}
NSLog(@"allEasyArrayQ %@", allEasyArrayQ);
NSLog(@"allMediumArrayQ %@", allMediumArrayQ);
NSLog(@"allHardArrayQ %@", allHardArrayQ);
这是输出：
2011-04-25 19:35:45.008 FamQuiz_R0_1[963:307] >>createQuestionsList<<
2011-04-25 19:35:45.021 FamQuiz_R0_1[963:307]
File exists in createQuestionList
2011-04-25 19:35:45.031 FamQuiz_R0_1[963:307] masterQuestionsArray (
1,
0,
0,
1,
5
)
2011-04-25 19:35:45.238 FamQuiz_R0_1[963:307] allEasyArrayQ (
)
2011-04-25 19:35:45.246 FamQuiz_R0_1[963:307] allMediumArrayQ (
)
2011-04-25 19:35:45.254 FamQuiz_R0_1[963:307] allHardArrayQ (
)
2011-04-25 19:35:45.311 FamQuiz_R0_1[963:307] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSMutableArray objectAtIndex:]: index 0 beyond bounds for empty array'
我真的很感激我能得到的所有帮助来解决这个非常令人沮丧的问题:-)
更新
我确实在委托中放入了一个 NSLog 以检查 storeURL，并在外部 iPhone 设备上运行时得到以下结果：
storeURL: file://localhost/var/mobile/Applications/7F5FDB03-0D22-46BC-91BC-4D268EB4BBEB/Documents/FamQuiz_R0_1.sqlite
以下是我在模拟器中运行，没有外部 iPhone 设备：
storeURL: file://localhost/Users/PeterK/Library/Application%20Support/iPhone%20Simulator/4.2/Applications/E27EC1A4-3A87-4A1B-97DE-D464679005BE/Documents/FamQuiz_R0_1.sqlite
【问题讨论】：
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标签： iphone objective-c core-data sqlite