[ReneG]

You don't need to fetch any data, just update.

pawn Код:

forward AddPlayerMoney(name[], cash);
public AddPlayerMoney(name[], cash)
{
    new query[128];
    format(query, sizeof(query), "UPDATE `users` SET `cash` = %d WHERE `name` = '%s'", cash, name);
    mysql_function_query(dbHandle, query, false, "", "");
    return 1;
}

Then just pass name and cash values as arguments to AddPlayerMoney from a command or something.