Gab*_*ono 3 php sql database-connection
我无法理解为什么连接到数据库的功能不起作用,我已经三次检查变量是否有任何错误.
在第12行的class.php上使用mysql_error函数我收到以下错误:
No database selected
class.php
<?php
class blog {
private $host;
private $username;
private $password;
private $db;
private $link;
public function __construct($host, $username, $password, $db){
$this->link = mysql_connect($host, $username, $password, $db);
mysql_select_db($this->db, $this->link) or die (mysql_error());
}
function get_content(){
$sql = "SELECT * FROM content";
$res = mysql_query($sql);
while($row = mysql_fetch_assoc($res)){
echo '<h1>'.$row['title'].'</h1>';
echo '<p>'.$row['body'].'</p>';
}
}
}// End of Class
?>
的index.php
<?php include 'includes/class.php' ?>
<?php
//Setup Connection
$obj = new blog('localhost', 'root', '', 'blog');
//Connect to DB
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" type="text/css" href="css/style.css" mce_href="styles1.css">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Mi Blog</title>
</head>
<body>
<div id="page-wrap">
<?php $obj->get_content() ?>
</div>
</body>
</html>
Chr*_*ong 10
你正在使用$this->db但从未设置它.试试这个:
public function __construct($host, $username, $password, $db){
$this->db = $db;
$this->link = mysql_connect($host, $username, $password, $db);
mysql_select_db($this->db, $this->link) or die (mysql_error());
}
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