从数据库中检索数据的问题

Question

代码已成功连接到数据库但是当我尝试从数据库中检索数据时，它无法正常工作。

    <?php

      $link = mysqli_connect("server name","username","password");

       if (mysqli_connect_error()) {

       die ("There was an error connecting to the database");

       } 

       $query = "SELECT * FROM users";

         if ($result = mysqli_query($link, $query)) {

             $row = mysqli_fetch_array($result);

             echo "Your email is ".$row[1]." and your password is ".$row[2];

            } else {

            echo mysqli_error($link);

            }

          ?>

Answer 1

你没有指定搜索哪个数据库，在mysqli上你应该再添加一个参数

$link = mysqli_connect("server name","username","password", "database");