Question

这是我的第一个php代码，我正在尝试使用用户名=＆＃34; root＆＃34;连接到数据库。和密码=＆＃34; root＆＃34;

我有一个名为dbConnection.php的连接文件如下：

<?php
echo "in connection file";
$hostname = "localhost";
$username = "root";
$password = "root";
$db = "ledDB";
echo "<br> db-connection : vars definde ";


//connection to the database
$conn = mysql_connect($hostname, $username, $password)
  or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";
echo "db-connection : initilize connection ";
mysql_select_db($db);
echo "db-connection : connection done";
// Check connection

echo "Connected successfully";
?>

我在名为what.php的文件中调用它：

<?php
echo "Hello";
include "dbConnection.php";
echo "ohhhh";
?>

这将返回状态代码500，即内部服务器错误

但我想知道修复它的错误是什么我如何收到错误消息？

我试过

$ conn = mysql_connect（$ hostname，$ username，$ password）或死（＆＃34;无法连接到MySQL＆＃34;）;

但它没有返回任何东西。

任何人都能帮帮我吗？

Answer 1

如果您在localhost上有密码，请使用密码，否则请将其留空

  $con = mysqli_connect("localhost","root","yourpassword","yourdb");

Answer 2

你是mysqli_connect（）方法。

<?php
echo "in connection file";
$hostname = "localhost";
$username = "root";
$password = "root";
$db = "ledDB";
echo "<br> db-connection : vars definde ";


//connection to the database
$conn = mysqli_connect($hostname, $username, $password)
  or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";
echo "db-connection : initilize connection ";
mysqli_select_db($conn,$db);
echo "db-connection : connection done";
// Check connection

echo "Connected successfully";
?>

Answer 3

首先要将您的连接方法更改为mysqli或我个人喜爱的PDO。 PDO示例：

class db extends pdo{
    //Website Variables

    public $sitedb = '';
    public $siteconfig;
    public $sitesettings = array(
        'host'      => 'localhost',
        'database'  => 'yourdb',
        'username'  => 'youruser',
        'password'  => 'yourpass',
    );

    public function __construct(){

        $this->sitedb = new PDO(
            "mysql:host={$this->sitesettings['host']};" .
            "dbname={$this->sitesettings['database']};" .
            "charset=utf8",
            "{$this->sitesettings['username']}",
            "{$this->sitesettings['password']}"
        );

        $this->sitedb->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    }


}

$db = new db();

然后，您可以在包含db.php页面后将PDO类扩展到新类。示例选择：

   class yourclass extends db {
           public function SelectUsers() {
                    global $db;
                    $query = <<<SQL
                    SELECT email
                    FROM users
                    WHERE active = :active
   SQL;
           $resource = $db->sitedb->prepare( $query );
           $resource->execute( array (
                  ':active' => 1,
                  ));
            $count = $resource->rowCount();
            foreach($resource as $user){
                    $this->email = $user['email'];
              }
          }
         }

php mysql连接获取错误消息

4 个答案: