Question

我正在尝试连接到数据库，它已成功连接但无法使用数据库。我对PHP的这个概念很新。如果我在某个地方出错，请帮帮我，让我知道

<?php
    define('DB_NAME', 'bvh');
    define('DB_USER', 'root');
    define('DB_PASSWORD', '');
    define('DB_HOST', 'localhost');

    $link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);

    if(!$link){
        die('could not connect: '.mysql_error());
    }
    echo 'Connected Successfully<br>';
    $db_selected = mysql_select_db(DB_NAME, $link);

    if(!$db_selected){
        die('Cannot use '.DB_NAME.':'. mysql_error());
    }
    $yname=$_POST['yname'];
    $faculty=$_POST['faculty'];
    $class=$_POST['class'];
    $uname=$_POST['uname'];
    $email=$_POST['email'];
    $pwd=$_POST['pwd'];
    $rpwd=$_POST['rpwd'];

    $sql = "INSERT INTO students (yname, faculty, class, uname, email, pwd, rpwd) VALUES('$yname', '$faculty', '$class', '$uname', '$email', '$pwd', '$rpwd')";

    if(!mysql_query($sql)){
        die('Error: ' .mysql_error());
    }
    mysql_close();
    ?>

Answer 1

我尝试执行您的代码段。一切都很好。我确保照顾以下事项：

数据库bvh存在登录MySQL提示符，使用命令create database bvh;
然后在数据库bvh
使用php解释器从我的命令行中运行你的php代码。 php <filename.php>

输出显示“已成功连接”。以下是输出：

Connected Successfully<br>PHP Notice:  Undefined index: yname in /var/www/test.php on line 18
PHP Notice:  Undefined index: faculty in /var/www/test.php on line 19
PHP Notice:  Undefined index: class in /var/www/test.php on line 20
PHP Notice:  Undefined index: uname in /var/www/test.php on line 21
PHP Notice:  Undefined index: email in /var/www/test.php on line 22
PHP Notice:  Undefined index: pwd in /var/www/test.php on line 23
PHP Notice:  Undefined index: rpwd in /var/www/test.php on line 24

PHP Notice是因为数据没有发布到PHP。但是连接成功了，我可以通过确保上述步骤来访问数据库。

无法使用database.DB_NAME

1 个答案: