Update row in sqlite isn`t updating - ios

Question

I am trying to update just one cell in row but I can`t get it work. Method for updating:
- (void) UpdateQuestionShownParameter:(int)QuestionId :(BOOL)QuestionShown{
#try {
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:#"Milionar.sqlite"];
const char *sql = "UPDATE Questions set Show = ? WHERE id = ?";
BOOL success = [fileMgr fileExistsAtPath:dbPath];
if(!success)
{
NSLog(#"Cannot locate database file '%#'.", dbPath);
}
if(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK)
{
sqlite3_stmt *sqlStatement;
if(sqlite3_prepare_v2(db, sql, -1, &sqlStatement, NULL) == SQLITE_OK)
{
NSInteger shownInteger = (QuestionShown ? 1 : 0);
sqlite3_bind_int(sqlStatement, 1, shownInteger);
sqlite3_bind_int(sqlStatement, 2, QuestionId);
if (sqlite3_step(sqlStatement) != SQLITE_DONE)
{
NSLog(#"Error while updating. '%s'", sqlite3_errmsg(db));
}
sqlite3_finalize(sqlStatement);
}
else
{
NSLog(#"Problem with prepare statement");
}
}
else
{
NSLog(#"An error has occured while opening database.");
}
sqlite3_close(db);
}
#catch (NSException *exception) {
NSLog(#"An exception occured: %#", [exception reason]);
}
}
Trying in ViewDidLoad:
- (void)viewDidLoad
{
ListOfQuestions *listQuestions =[[ListOfQuestions alloc] init];
self.Questions = [listQuestions getQuestions];
Question *generatedQuestion = (Question *) [self.Questions objectAtIndex:0];
[listQuestions UpdateQuestionShownParameter:generatedQuestion.id :TRUE];
[self.Description setText:(generatedQuestion.Description)];
[super viewDidLoad];
// Do any additional setup after loading the view.
}
Everytime when I tried to run app I get 0 in Shown column. But I don`t have any errors. So am I doing something wrong or everytime when I tried to run app in emulator I get recreate database from project database?
Thanks

Answer 1

You are opening the database in the bundle, which is read-only. You should be copying the database from bundle to Documents folder if the database doesn't already exist in Documents folder:
NSString *filename = #"Milionar.sqlite";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *bundlePath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:filename];
NSString *documentsFolder = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSString *documentsPath = [documentsFolder stringByAppendingPathComponent:filename];
if (![fileManager fileExistsAtPath:documentsPath]) {
NSError *error = nil;
BOOL success = [fileManager copyItemAtPath:bundlePath toPath:documentsPath error:&error];
NSAssert(success, #"Unable to copy database: %#", error);
}
if (sqlite3_open([documentsPath UTF8String], &db) != SQLITE_OK) {
NSLog(#"Open failed");
} else {
// ...
}
For more information about where documents belong, see the File System Programming Guide.
By the way, if you're looking for the Documents folder for your simulator, that's located in ~/Library/Application Support/iPhone Simulator (in Xcode 6, this is now ~/Library/Developer/CoreSimulator/Devices). If you don't see the "Library" folder, you can unhide it by typing the following command into your Terminal command line interface:
chflags nohidden ~/Library