小编Art*_*tem的帖子

这是我的代码我有2个表预订//创建以保留会员userinfo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();  
   ?>

我不知道它为什么不更新.