Question

我正在使用MySQL和PHP编写注册表，在MySQL中我有2个表：users和a_codes。在我定义并将一些用户名插入a_codes表之前。当用户在注册表单中输入用户名时，将使用a_codes表中的记录进行检查（如果存在）则完成注册。我的问题是我想要在用户成功注册后，必须删除a_codes表中提到的用户名。我下面的代码中的所有内容均正常运行。唯一的问题是如何删除a_codes表中使用的用户名？。我是PHP新手，感谢您的帮助。

<?php 

require_once 'DbConnect.php';

//an array to display response
$response = array();

if(isset($_GET['apicall'])){

    switch($_GET['apicall']){

        case 'signup':
            //checking the parameters required are available or not 
            if(isTheseParametersAvailable(array('username','email','password','gender'))){

                //getting the values 
                $username = $_POST['username']; 
                $email = $_POST['email']; 
                $password = md5($_POST['password']);
                $gender = $_POST['gender']; 

                //checking if the user is already exist in a_codes table with this username 
                $stmt = $conn->prepare("SELECT id FROM a_codes WHERE username = ?");
                $stmt->bind_param("s", $username);
                $stmt->execute();
                $stmt->store_result();

                //if the user already exist in the database 
                if($stmt->num_rows > 0){ 
                //if user is already exist creating an insert query 
                    $stmt = $conn->prepare("INSERT INTO users (username, email, password, gender) VALUES (?, ?, ?, ?)");
                    $stmt->bind_param("ssss", $username, $email, $password, $gender);

                    //if the user is successfully added to the database 
                    if($stmt->execute()){

                        //fetching the user back 
                        $stmt = $conn->prepare("SELECT id, id, username, email, gender FROM users WHERE username = ?"); 
                        $stmt->bind_param("s",$username);
                        $stmt->execute();
                        $stmt->bind_result($userid, $id, $username, $email, $gender);
                        $stmt->fetch();

                        $user = array(
                            'id'=>$id, 
                            'username'=>$username, 
                            'email'=>$email,
                            'gender'=>$gender
                        );

                        $stmt->close();

                        //adding the user data in response 
                        $response['error'] = false; 
                        $response['message'] = 'done'; 
                        $response['user'] = $user; 
                    }


                } else {

                    $response['error'] = true;
                    $response['message'] = 'already registered';
                    $stmt->close();
                }

            }else{
                $response['error'] = true; 
                $response['message'] = 'error eccoured'; 
            }

            break;

Answer 1

mysql删除的正确语法是;-

DELETE FROM table_name WHERE column = value;

根据您的情况将是

DELETE FROM `a_codes` WHERE `username` = "insert the username here"

或

$stmt = $conn->prepare("DELETE FROM a_codes WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();

使用PHP从MySQL中的指定表中删除记录

1 个答案: