使用FMDB打开数据库连接时出错

Question

当我要打开与数据库的连接时,控制台说:"错误打开!:14".我在项目的资源文件夹中包含了"mybase.sqlite",我正在使用FMDB框架.

对于开放式连接我正在使用此代码:

 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];    
    FMDatabase* db = [FMDatabase databaseWithPath:@"/mybase.sqlite"];
    if (![db open]) {
        NSLog(@"Não abriu o banco de dados.");
        [pool release];
        return 0;
    }

在AppDelegate中,我包含了以下代码:

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

    // Override point for customization after application launch.  HomeViewController *homeVC = [[HomeViewController alloc] init];  navigationController = [[UINavigationController alloc] initWithRootViewController:homeVC];    [self createEditableCopyOfDatabaseIfNeeded];  [window addSubview:navigationController.view];
    [window makeKeyAndVisible]; 
    return YES; }

- (void)createEditableCopyOfDatabaseIfNeeded{  BOOL success;  NSFileManager
*fileManager = [NSFileManager defaultManager];  NSError *error;  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  NSString
*documentsDirectory = [paths objectAtIndex:0];  NSString
*writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"mybase.sqlite"];  success = [fileManager fileExistsAtPath:writableDBPath];  NSLog(@"Success %d", success);  if (success) return;    NSString
*defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"mybase.sqlite"];  success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];  if (!success) {   NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);  }  }

Answer 1

我认为你的开放路径可能不正确.您指定的路径没有意义,就像您的DB文件位于根文件夹中一样.

FMDatabase* db = [FMDatabase databaseWithPath:@"/mybase.sqlite"];

上面应该使用此代码作为文件路径,您已在问题中使用.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"mybase.sqlite"];
FMDatabase* db = [FMDatabase databaseWithPath:writableDBPath];