我有一个应用程序,我试图将几个不同的表保存到文档目录。第一个保存很好,但其他人没有。我一直在研究,并没有找到任何说我不能这样做的东西。希望有人能说清楚。我正在使用的代码是典型的“CreateEditableCopyOfDatabaseIfNeeded”,但就像我说的,我有几个版本,具体取决于我想要保存的db。下面的代码是第二个不能用于“无法打开DB”的代码 提前谢谢。
- (void)createEditableCopyOfScheduleDatabaseIfNeeded
{
//test if DB already exist
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//save new DB's
NSString *writableScheduleDBPath = [documentsDirectory stringByAppendingPathComponent:@"schedulelist.sqlite3"];
NSLog(@"writable Schedule path:%@", writableScheduleDBPath);
success = [fileManager fileExistsAtPath:writableScheduleDBPath];
if (!success)
NSLog(@"Failure to open Schedule DB");
if (success) return;
//the writable database does not exist, so copy the default to the appropriate location
NSString *defaultScheduleDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"schedulelist.sqlite3"];
NSLog(@"default Schedule path:%@", defaultScheduleDBPath);
success = [fileManager copyItemAtPath:defaultScheduleDBPath toPath:writableScheduleDBPath error:&error];
if (!success)
NSAssert1(0, @"Failed to create Schedule writable database:%@", [error localizedDescription]);
}
答案 0 :(得分:0)
当它第一次运行时,它将显示NSLog(@"Failure to open Schedule DB");
,因为文档目录中没有数据库。
是的错误就在这一行:
success = [fileManager copyItemAtPath:defaultScheduleDBPath toPath:writableScheduleDBPath error:&error];
只需交换你很好的参数。