php，使用mysql_connect（）连接数据库的问题，怎么办？
[英]php, connecting to database using mysql_connect() problem, how to?
问题描述
i am using some php and ajax to make a call to a database and i get this error: Warning: mysql_query() [function.mysql-query]: A link to the server could not be established... and Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) 
我正在使用一些php和ajax来调用数据库，但出现此错误： Warning: mysql_query() [function.mysql-query]: A link to the server could not be established...并且Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
now from what i read looks like i need to create a database connection first, and the problem is that i am. 现在从我阅读的内容来看，我需要首先创建一个数据库连接，而问题是我在。
I am using require_once ('db_connect.php'); 我正在使用require_once ('db_connect.php'); at the begining: 在开始时：
<?php
define("HOST", "localhost");
define("DBUSER", "123");
define("PASS", "123");
define("DB", "123");
$prefix = "";
############## Make the mysql connection ###########
$conn = mysql_connect(HOST, DBUSER, PASS) or die('Could not connect !<br />Please contact the site\'s administrator.');
$db = mysql_select_db(DB) or die('Could not connect to database !<br />Please contact the site\'s administrator.');
?>
My script looks something like this (ignore any missing or broken html): 我的脚本看起来像这样（忽略任何丢失或损坏的html）：
<?php
session_start();
require_once ('db_connect.php'); // include the database connection
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns:og="http://ogp.me/ns#" xmlns:fb="http://www.facebook.com/2008/fbml" xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<html>
<head>
</head>
<body>
<div id="wrap">
<script type="text/javascript">
$(function() {
$(".submit").click(function() {
var name = $("#name").val();
var com_type = 1;
var email = $("#email").val();
var comment = $("#comment").val();
var post_id = $("#post_id").val();
var dataString = 'name='+ name + '&email=' + email + '&comment=' + comment + '&post_id=' + post_id;
if(name=='' || email=='' || comment=='')
{
alert('Please Give Valide Details');
}
else
{
$("#flash").show();
$("#flash").fadeIn(400).html('<img src="ajax-loader.gif" align="absmiddle"> <span class="loading">Loading Comment...</span>');
$.ajax({
type: "POST",
url: "commentajax.php",
data: dataString,
cache: false,
success: function(html){
$("ol#update").append(html);
$("ol#update li:last").fadeIn("slow");
document.getElementById('email').value='';
document.getElementById('name').value='';
document.getElementById('comment').value='';
$("#name").focus();
$("#flash").hide();
}
});
}
return false;
});
});
</script>
<div id="main">
<ol id="update" class="timeline">
<?php
$sql=mysql_query("select * from comments where post_id_fk='$post_id'");
while($row=mysql_fetch_array($sql))
{
$name=$row['com_name'];
$com_type=$row['com_type'];
$email=$row['com_email'];
$comment_dis=$row['com_dis'];
$lowercase = strtolower($email);
$image = md5( $lowercase );
?>
<li class="box">
<img src="http://www.gravatar.com/avatar.php?gravatar_id=<?php echo $image; ?>" class="com_img">
<span class="com_name"> <?php echo $name; ?><?php echo $com_type; ?></span> <br />My Comment</li>
<?php
}
?>
</ol>
<div id="flash" align="left" ></div>
<div style="margin-left:100px">
<form action="#" method="post">
<input type="hidden" name="post_id" id="post_id" value="<?php echo $post_id; ?>"/>
<input type="text" name="title" id="name"/><span class="titles">Name</span><span class="star">*</span><br />
<input type="text" name="email" id="email"/><span class="titles">Email</span><span class="star">*</span><br />
<textarea name="comment" id="comment"></textarea><br />
<input type="submit" class="submit" value=" Submit Comment " />
</form>
</div>
</div>
</div>
</body>
</html>
the connectajax.php : connectajax.php：
<?php
if($_POST)
{
$name=$_POST['name'];
$name=mysql_real_escape_string($name);
$com_type=$_POST['com_type'];
$name=mysql_real_escape_string($com_type);
$email=$_POST['email'];
$email=mysql_real_escape_string($email);
$comment=$_POST['comment'];
$comment=mysql_real_escape_string($comment);
$post_id=$_POST['post_id'];
$post_id=mysql_real_escape_string($post_id);
$lowercase = strtolower($email);
$image = md5( $lowercase );
mysql_query("insert into comment(com_name,com_type,come_email,com_dis) values ('$name','$com_type','$email','$comment_dis','$post_id')");
}
?>
<li class="box">
<img src="http://www.gravatar.com/avatar.php?gravatar_id=
<?php echo $image; ?>"/>
<?php echo $name;?><br />
<?php echo $comment; ?>
</li>
any idea? 任何想法？ thanks 谢谢
3 个解决方案
解决方案1
3 已采纳 2011-06-27 03:37:39
你没有require_once的db_connect.php在你的脚本connectajax.php脚本（除非你在复制代码时忽略该行）。
解决方案2
0 2011-06-27 03:32:50
Sounds to me as though your mysql service is down. 在我看来，您的mysql服务已关闭。 Try reloading it. 尝试重新加载。 If that doesn't work, maybe try connecting to a mysql database on another server, to see if maybe it's not the mysql service's fault. 如果这不起作用，请尝试连接到另一台服务器上的mysql数据库，以查看是否不是mysql服务的问题。
解决方案3
0 2011-06-27 03:44:12
检查您是否已授予对Mysql数据库的适当访问权限...将解决此问题
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