这是我的代码我有 2 个表预订 // 创建以保留来自会员用户信息的预订 // 保留会员的用户名
<?php
$ta = $_POST['table'];
$day=$_POST['date'];
$usern = $_SESSION['username'];
$con = mysql_connect("localhost","root","password") or die ("can't connect to host");
mysql_select_db("register",$con) or die("can't connect to database");
$sql = "select * from userinfo where username = '$usern' ";
$rs = mysql_query($sql);
$row = mysql_num_rows($rs);
if($row == 0)
{ mysql_query("insert into booking(username) values '".$usern. "' ");
mysql_db_query("register");
} mysql_close();
?>
我不知道为什么它不更新。