Question

如何将此语句转换为mysqli。我尝试转换它但不起作用。我错过了什么我想连接到登录表单。

这是我转换的代码。

<?php
include('admin/dbcon.php');
        session_start();
        $username = $_POST['username'];
        $password = $_POST['password'];

        /* teacher */
        $query_teacher = mysql_query("SELECT * FROM teacher WHERE username='$username' AND password='$password'")or die(mysql_error());
        $num_row_teacher = mysql_num_rows($query_teacher);
        $row_teahcer = mysql_fetch_array($query_teacher);

        /* admin */
        $query_admin = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'")or die(mysql_error());
        $num_row_admin = mysql_num_rows($query_admin);
        $row_admin = mysql_fetch_array($query_admin);


         if ($num_row_teacher > 0){
        $_SESSION['id']=$row_teahcer['teacher_id'];
        echo 'true';

        }else if ($num_row_admin > 0){
        $_SESSION['id']=$row_admin['user_id'];
        echo 'true_admin';

         }else{ 
                echo 'false';
        }   

        ?>

这是转换后的mysqli，但我仍然无法登录，我错过了一些东西。如果你能帮助我解决这个问题，我将非常感激。

<?php

// establishing the MySQLi connection



$con = mysqli_connect("localhost","root","","retreat");

if (mysqli_connect_errno())

{

echo "MySQLi Connection was not established: " . mysqli_connect_error();

}

// checking the user
        session_start();

        $username = mysqli_real_escape_string($con,$_POST['username'];
        $password = mysqli_real_escape_string($con,$_POST['password'];


        /* teacher */



        $query_teacher = "SELECT * FROM teacher WHERE username='$username' AND password='$password'";

        $num_row_teacher = mysqli_query($con,$query_teacher);

        $row_teahcer = mysqli_num_rows($num_row_teacher);

        /* admin */
        $query_admin = "SELECT * FROM users WHERE username='$username' AND password='$password'";

        $num_row_admin = mysqli_query($con,$query_admin);
        $row_admin = mysqli_num_rows($num_row_admin);


         if ($row_teahcer > 0){
             //$_SESSION['user_email']=$email;
        $_SESSION['']=$row_teacher['teacher_id'];
        echo 'true';

        }else if ($num_row_admin > 0){
        $_SESSION['id']=$row_admin['user_id'];
        echo 'true_admin';

         }else{ 
                echo 'false';
        }   

        ?>

Answer 1

 <?php
//db details
$dbHost = 'localhost';
$dbUsername = 'root';
$dbPassword = '';
$dbName = 'retreat';

//Connect and select the database
$db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName);

if ($db->connect_error) {
    die("Connection failed: " . $db->connect_error);
}

            session_start();
            $username = $_POST['username'];
            $password = $_POST['password'];



            /* teacher */
            $query = $db->query("SELECT * FROM teacher WHERE username='$username' AND password='$password'")or die(mysqli_error());
            $num_row_teacher = mysqli_num_rows($query);
            $row_teahcer = mysqli_fetch_array($query);



            /* admin */
            $query_admin = $db->query("SELECT * FROM users WHERE username='$username' AND password='$password'")or die(mysqli_error());
            $num_row_admin = mysqli_num_rows($query_admin);
            $row_admin = mysqli_fetch_array($query_admin);


             if ($num_row_teacher > 0){
            $_SESSION['id']=$row_teahcer['teacher_id'];
            echo 'true';

            }else if ($num_row_admin > 0){
            $_SESSION['id']=$row_admin['user_id'];
            echo 'true_admin';

             }else{ 
                    echo 'false';
            }   


    enter code here
        ?>

Answer 2

你遗失了

$row_teahcer=mysqli_fetch_array($num_row_teacher);
$row_admin=mysqli_fetch_array( $num_row_admin);

mysqli转换获取查询

2 个答案: