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这是我的代码 我有2张 table 预订//创建以防止成员(member)预订 userinfo//保留成员(member)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();
?>
不知道为什么不更新。