php - Mysql 查询在 if 子句中不接受？

Question

这是我的 php 代码，它不能正常工作....

它不采用 if 条件下的查询，每次执行 else 部分时......

  <?php
  include('admin/class.php');

** 这是我的数据库连接**

  $hostname="localhost";
  $username="root";
   $password="";

 $dbhandle = mysql_connect($hostname, $username, $password)
 or die("Unable to connect to MySQL");
  echo "Connected to MySQL<br>"; 
  $se = mysql_select_db("timesheet1234",$dbhandle)
  or die("Could not select timesheet1234");
 echo "connected to db";

 if(isset($_POST['save']))
   {  
   echo "post if";

 $sel=@$_POST['selpro'];
  $mon=@$_POST['mon'];
  $tue=@$_POST['tue'];
  $wed=@$_POST['wed'];
  $thu=@$_POST['thu'];
  $fri=@$_POST['fri'];
  $sat=@$_POST['sat'];
   $sun=@$_POST['sun'];

这是我的代码，问题从这里开始并且无法正常工作

  if(isset($_SESSION['user']))
  {
   echo "session user";
        $sql="UPDATE empdaytimesheet SET `project  code`='$sel',`mon`='$mon',`tue`='$tue',`wed`='$wed',`thu`='$thu',`fri`='$fri',`sat`='$sat',`sun`='$sun' where `username`='".$_SESSION['user']."'";

 $res=mysql_query($sql,$dbhandle);
 if($res){
 echo "<script type='text/javascript'>";
 echo "alert('TimeSheet Saved..!')";
 echo "</script>";
 echo "<script type='text/javascript'>";
 echo "window.location='my_timesheet.php'";
 echo "</script>";
 }
  else
 {
 echo "<script type='text/javascript'>";
  echo "alert('Some Error Occured ! Retry..!')";
 echo "</script>";
 echo "<script type='text/javascript'>";
echo "window.location='my_timesheet.php'";
echo "</script>";
}
}
}
?>

Answer 1

改变

$sql="UPDATE table empdaytimesheet SET project  code='$sel',...

到

$sql="UPDATE empdaytimesheet SET `project  code`='$sel', ...
             ^ no table here     ^             ^ backticks