程序代码：

function changebalance($acc, $val) {
    /**
     * @param $acc 账号
     * @param $val 改变的值,正负都可以
     */
    $rval = ($val < 0) ? ('-' . abs ( $val )) : ('+' . abs ( $val ));
    $m = mssql_connect ( DBHOST, DBUSER, DBPWD );
    if (! $m) {
        return false;
    }
    if (! mssql_select_db ( 'account_dbf' )) {
        return false;
    }
    $sql = 'UPDATE account_tbl_detail SET balance=balance' . $rval . ' WHERE lower(account)=' . "lower('$acc')";
    $q = mssql_query ( $sql );
    if (! $q) {
        return false;
    } else {
        $r = mssql_rows_affected ( $m );
        if ($r && ($val < 0)) {
            //改变成功 并且是负值,则增加消费积分,1角1分
            changepoints ( $acc, abs ( $val ) );
        }
        return ( bool ) $r;
    }
}