该函数用于执行SQL命令，然后通过 PHP 函数 mysql_fetch_array() 来输出所有查询的数据。

实例

以下实例将从 runoob_tbl 表中返回使用 runoob_author 字段值为 Sanjay 的记录：

<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'password';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}
$sql = 'SELECT title, author, submission_date
        FROM tbl
        WHERE uthor="nan"';

mysql_select_db('dbname');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
  die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_array($retval, MYSQL_ASSOC))
{
    echo "Tutorial ID :{$row['runoob_id']}  <br> ".
         "Title: {$row['runoob_title']} <br> ".
         "Author: {$row['runoob_author']} <br> ".
         "Submission Date : {$row['submission_date']} <br> ".
         "--------------------------------<br>";
} 
echo "Fetched data successfully\n";
mysql_close($conn);
?>

懂了原理，这些代码就是很简单了