insert数据，显示数据列表

<!--向表中添加数据，并且显示出来-->

<?php 
$con = mysql_connect("localhost","root",""); 
if (!$con)
  {
  die('Could not connect: ' . mysql_error());    
  }
  
mysql_select_db("my_db", $con);    //选取数据库

//////////////////////////////////向表内插入数据
mysql_query("INSERT INTO world (Id, Name, Location) 
VALUES ('$_POST[Id]', '$_POST[Name]', '$_POST[Location]')");

/////////////////////////////////查询出数据，显示出来
$result = mysql_query("SELECT * FROM world");
echo "<table border='1'>
    <tr>
    <th>id</th>
    <th>name</th>
    <th>location</th>
    </tr>";

while($row = mysql_fetch_array($result))
  {
  echo "<tr>";
  echo "<td>" . $row['Id'] . "</td>";
  echo "<td>" . $row['Name'] . "</td>";
  echo "<td>" . $row['Location'] . "</td>";
  echo "</tr>";
  }
echo "</table>";

/////////////////////////////////关闭连接
mysql_close($con);
?>