我错了，为什么不连接？ [关闭]

   {<?

mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("db") or die(mysql_error());


$result = mysql_query("SELECT * FROM product")
or die(mysql_error());


$row = mysql_fetch_array( $result );


echo "product: ".$row['product'];
echo " price  : ".$row['price'];

?>}

Your problem is that you have to store your connection in a variable.

<?php

$dbconn = mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("db", $dbconn);


$result = mysql_query("SELECT * FROM product", $dbconn);

$row = mysql_fetch_array( $result );

echo "product: ".$row['product'];
echo " price  : ".$row['price'];

?>

It's very recommended to use mysqli or PDO instead, since the mysql extension is now deprecated in PHP.