Question

I have been dropping my sqlite DB in the supporting files of my app for testing purposes. I’m currently trying to move this out to a URL, so I will be able to update the DB without updating the app. I’m using the following code, which appears to be working, as it downloads the file to the Documents Directory. Problem is I have removed the old DB from the Supporting Files and it’s data is still being pulled. I made a change in my DB so I would know the difference.

Is there some memory I need to clear out? If not what am I missing here.

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSString *file = [NSString stringWithFormat:@"http://www.myurl/TulsaListBars.sqlite"];
    NSURL *fileURL = [NSURL URLWithString:file];

    NSURLRequest *req = [NSURLRequest requestWithURL:fileURL];
    NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self];

    fileData = [NSMutableData data];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [fileData setLength:0];
    totalFileSize = [NSNumber numberWithLongLong:[response expectedContentLength]];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [fileData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSArray *dirArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,    NSUserDomainMask, YES);
    NSLog(@"%@", [dirArray objectAtIndex:0]);

    NSString *path = [NSString stringWithFormat:@"%@/TulsaListBar.sqlite", [dirArray objectAtIndex:0]];

    if ([fileData writeToFile:path options:NSAtomicWrite error:nil] == NO) {
        NSLog(@"writeToFile error");
    }
    else {
        NSLog(@"Written!");
    }
}

The following code is how I read my DB.

-(NSMutableArray *) barList{
    thebars = [[NSMutableArray alloc] init];
    @try {
        NSFileManager *fileMgr = [NSFileManager defaultManager];
        NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"TulsaListBars.sqlite"];
        BOOL success = [fileMgr fileExistsAtPath:dbPath];
        if(!success)
        {
            NSLog(@"Cannot locate database file '%@'.", dbPath);
        }else{
            NSLog(@"File Exists: %@", dbPath);
        }
        if(!(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK))
        {
            NSLog(@"An error has occured: %s", sqlite3_errmsg(db));

        }       

        const char *sql = "SELECT * FROM Locations WHERE bar = 'yes'";
        sqlite3_stmt *sqlStatement;
        if(sqlite3_prepare(db, sql, -1, &sqlStatement, NULL) != SQLITE_OK)
        {
            NSLog(@"Problem with prepare statement:  %s", sqlite3_errmsg(db));
        }else{

            while (sqlite3_step(sqlStatement)==SQLITE_ROW) {
                Bar * bar = [[Bar alloc] init];
                bar.barName = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,1)];
                bar.barAddress = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,2)];

                etc.....

Answer 1

The old copy of your database is still in the documents directory. If you write to file and the file already exists, writeToFile: should overwrite it, but of course it must have the same name / path.

Solution: Just delete the app from simulator / device and run it your app again. Also, make sure you are addressing the correct path when opening the database.