php不会连接到mysql [英] php wont connect to mysql

问题描述

我试图创建一个连接到mysql数据库并将数据插入数据库的PHP文件。但是我无法连接到数据库。我得到以下错误
（！）注意：未定义的变量：dbname在C：\wamp\www\php_Final_kk.php在第34行
调用堆栈

I am trying to create a PHP file that connects to a mysql database and inserts data into the database. However I am having difficulty getting it to connect to the database. I get the following error ( ! ) Notice: Undefined variable: dbname in C:\wamp\www\php_Final_kk.php on line 34 Call Stack

（！）注意：未定义的变量：sql在C：\wamp\www\php_Final_kk.php在第52行

( ! ) Notice: Undefined variable: sql in C:\wamp\www\php_Final_kk.php on line 52

SQLSTATE [HY000 ] [1045]拒绝用户'root'@'localhost'的访问（使用密码：YES）

SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES)

我的用户名和密码对于数据库是正确的，授予，但我只是不能似乎得到它连接任何帮助将被aprreciated和我已经包括我的代码下面。感谢！

My username and password are correct for the database and all privilges have been granted but I just can not seem to get it to connect any help would be aprreciated and I have included my code below. Thanks!

<?php


$servername = "localhost";
$username = "root";
$password = "";

// Create connection
$conn = mysqli_connect($servername, $username, $password);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

    $fname = $_POST['fname'];
    $lname = $_POST['lname'];
    $email = $_POST['email'];
    $uname = $_POST['uname'];
    $password = $_POST['password'];
    $SSN = $_POST['ssn'];

    try {
        $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

        // set the PDO error mode to exception
        $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);





$sql = "INSERT INTO users (fname, lname,email,username,password,SSN) VALUES ('$fname',        '$lname', '$email', '$uname', '$password', '$ssn')";


        // use exec() because no results are returned
        $conn->exec($sql);
        echo "New record created successfully";
        }

    catch(PDOException $e)
        {

        echo $sql . "<br>" . $e->getMessage();
        }

    $conn = null;





?>

enter code here

推荐答案

当您通过 mysqli_connect 创建连接时，您必须提供4个参数：主机，用户名，密码和数据库名称。您缺少数据库名称。

When you create connection via mysqli_connect, you must supply 4 arguments: host, username, password and database name. You lack database name.

正确的调用是：

$link = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');

if (!$link) {
    die('Connect Error (' . mysqli_connect_errno() . ') '
            . mysqli_connect_error());
}

这一切都在官方文档

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