mysql-php从数据库中读取某个表中的数据并在页面中一条条列出来，代码如下，数据库里有信息，显示不出来

  <?php        <br/>  include("connectDB.php");        <br/>  @$query=mysql_query($con,"SELECT * from xx");        <br/>  @$result=mysql_fetch_array(@$query);        <br/>  if($result==true){        <br/>  ?>           <br/>  <table width="100%" height="30"  border="0" cellpadding="0" cellspacing="0">            <br/>  <tr>              <br/>  <td height="36" align="center">暂无信息！</td>            <br/>  </tr>          <br/>  </table><table width="100%"  border="0" cellspacing="0" cellpadding="0"><br/>    <tr><br/>        <td width="13%">      <br/>        <a href="newxx.php">插入信息</a>    <br/>        <td width="13%">      <br/>        <a href="query.php">查询信息</a>    <br/>        </td><br/>          </tr></table> <br/>          <?php}else{?><br/>           <table width="90%"  height="70%" border="0" cellspacing="0" cellpadding="0"><br/>             <tr><br/>                 <br/>            <td width="13%">     <br/>            <a href="newxx.php">插入信息</a>   <br/>            </td> <br/>            <td width="13%">     <br/>            <a href="query.php">查询信息</a><br/>            </td>  </tr></table>  <br/>            <table width="80%" height="70%"  border="1" cellpadding="0" cellspacing="0" bordercolor="#FFFFFF"          <br/>           bordercolordark="#D2E3E6" bordercolorlight="#FFFFFF">         <br>         <br>         <br>         <br/>          <tr align="center"><td align="center">信息</td><br/>           </tr></table><table width="90%" height="70%"  border="3" cellpadding="1" cellspacing="1" bordercolor="#FFFFFF"         <br/>          bordercolordark="#D2E3E6" bordercolorlight="#FFFFFF">  <tr align="center" bgcolor="#e3F4F7">    <br/>          <td width="10%" bgcolor="#e3F4F7">信息id</td>      <br/>         <td width="30%" bgcolor="#e3F4F7">信息内容</td>    <br/>         <td width="14%" bgcolor="#e3F4F7">查看</td>    <td width="10%" bgcolor="#e3F4F7">修改</td><br/>        </tr><?php//循环显示数据库信息do{ ?>  <tr>    <br/>        <td style="padding:5px;" bgcolor="#e3F4F7" align=center> <br/>        <?php echo $result['xxid'];?></td>      <br/>       <td style="padding:5px;" bgcolor="#e3F4F7" align=center> <br/>       <?php echo $result['xxnr'];?></td>      <br/>       <td align="center" bgcolor="#e3F4F7"><a href="show.php?$xxid=<?php echo $result['xxid'];?>">查看</a></td>    <br/>       <td align="center" bgcolor="#e3F4F7"><a href="updata.php?$xxid=<?php echo $result['xxid'];?>">修改</a></td>  <br/>       </tr><?php}while(@$result=mysql_fetch_array($query));}?>  <br/>