-(void) exportCsv: (NSString*) filename
{
    // We record this filename, because the app deletes it on exit
    self.tempFile = filename;

    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
    // Setup the database object
    sqlite3* database;

    // Open the database from the users filessytem
    if (sqlite3_open([self.databasePath UTF8String], &database) == SQLITE_OK)
    {
        [self createTempFile: filename];
        NSOutputStream* output = [[NSOutputStream alloc] initToFileAtPath: filename append: YES];
        [output open];
        if (![output hasSpaceAvailable]) {
            NSLog(@"No space available in %@", filename);
            // TODO: UIAlertView?
        } else {
            NSString* header = @"Source,Time,Latitude,Longitude,Accuracy\n";
            NSInteger result = [output write: [header UTF8String] maxLength: [header length]];
            if (result <= 0) {
                NSLog(@"exportCsv encountered error=%d from header write", result);
            }

            BOOL errorLogged = NO;
            NSString* sqlStatement = @"select timestamp,latitude,longitude,horizontalAccuracy from my_sqlite_table";

            // Setup the SQL Statement and compile it for faster access
            sqlite3_stmt* compiledStatement;
            if (sqlite3_prepare_v2(database, [sqlStatement UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK)
            {
                // Loop through the results and write them to the CSV file
                while (sqlite3_step(compiledStatement) == SQLITE_ROW) {
                    // Read the data from the result row
                    NSInteger secondsSinceReferenceDate = (NSInteger)sqlite3_column_double(compiledStatement, 0);
                    float lat = (float)sqlite3_column_double(compiledStatement, 1);
                    float lon = (float)sqlite3_column_double(compiledStatement, 2);
                    float accuracy = (float)sqlite3_column_double(compiledStatement, 3);

                    if (lat != 0 && lon != 0) {
                        NSDate* timestamp = [[NSDate alloc] initWithTimeIntervalSinceReferenceDate: secondsSinceReferenceDate];
                        NSString* line = [[NSString alloc] initWithFormat: @"%@,%@,%f,%f,%d\n",
                                      table, [dateFormatter stringFromDate: timestamp], lat, lon, (NSInteger)accuracy];
                        result = [output write: [line UTF8String] maxLength: [line length]];
                        if (!errorLogged && (result <= 0)) {
                            NSLog(@"exportCsv write returned %d", result);
                            errorLogged = YES;
                        }
                        [line release];
                        [timestamp release];
                    }
                    // Release the compiled statement from memory
                    sqlite3_finalize(compiledStatement);
                }
            }
        }
        [output close];
        [output release];
    }

    sqlite3_close(database);
    [pool release];
}

-(void) createTempFile: (NSString*) filename {
    NSFileManager* fileSystem = [NSFileManager defaultManager];
    [fileSystem removeItemAtPath: filename error: nil];

    NSMutableDictionary* attributes = [[NSMutableDictionary alloc] init];
    NSNumber* permission = [NSNumber numberWithLong: 0640];
    [attributes setObject: permission forKey: NSFilePosixPermissions];
    if (![fileSystem createFileAtPath: filename contents: nil attributes: attributes]) {
        NSLog(@"Unable to create temp file for exporting CSV.");
        // TODO: UIAlertView?
    }
    [attributes release];
}