PHP INSERT INTO插入不了数据有关问题

PHP INSERT INTO插入不了数据问题

提交表单用INSERT INTO插入数据，但总是空白，没提示出错。请问那里有问题了？

<br />
@header("content-Type: text/html; charset=utf-8");<br />
require_once 'inc/site_config.php';<br />
require_once 'inc/db_connections.php';<br />
require_once 'inc/function.php';<br />
mysql_query('set character set "utf8"');<br />
 session_start();<br />
if($_REQUEST['action']=='postreg'){<br />
$sql_check_usr="select * from `reguser`  where `UserId`='".$_SESSION['uid']."'";<br />
$info=mysql_query($sql_check_usr);<br />
$dingdanhao=date("YmjHis").$info[UserId];<br />
$spc=$_SESSION[producelist];<br />
$slc= $_SESSION[quatity];<br />
$shouhuoren=$_POST['trusername'];<br />
$dizhi=$_POST['address'];<br />
$youbian=$_POST['phone'];<br />
$tel=$_POST['mob'];<br />
$email=$_POST['email'];<br />
if(trim($_POST['d_content'])==""){<br />
   $leaveword="";<br />
 }<br />
 else{<br />
   $leaveword=$_POST['d_content'];<br />
}<br />
 $xiadanren=$_SESSION['uid'];<br />
 $time=date("Y-m-j H:i:s");<br />
 $total=$_SESSION[total];<br />
 <br />
$sql_add_usr="INSERT INTO onlineorder  (dingdanhao,spc,slc,UserName,address,phone,mobile,mail,yqinfo,OrderTime,UserId,total_price) VALUES ('$dingdanhao','$spc','$slc','$trusername','$address','$phone','$mob','$email','$d_content','$time','$xiadanren','$total')";<br />
mysql_query($sql_add_usr);<br />
<br />
}	

php insert
------解决方案--------------------
把SQL语句打印出来，然后到PHPMYADMIN等工具中运行SQL语句看看结果如何。
这个是常用的检查SQL正确性方法。
------解决方案--------------------
$info=mysql_query($sql_check_usr);
$dingdanhao=date("YmjHis").$info[UserId];
$info 是个结果资源集，$info[UserId] 这样用不对

mysql_query($sql_add_usr) or die(mysql_error());  //这样看看是否报错