PHP會員管理系統 - 超入門版登入串接


Posted by 半夏 on 2021-08-25

開始製作登入畫面的連線,這裡用到 mysqli_num_rows($result) == 1 來判斷資料庫裡有沒有重複的資料。

<?php
    $servername = "localhost";
    $username = "member";
    $password = "123456";
    $dbname = "member";

    $conn = mysqli_connect($servername, $username, $password, $dbname);
    if(!$conn){
        die('連線失敗'.mysqli_connect_error($conn));
    }

    $sql = "SELECT * FROM usermember WHERE Username = 'Tina' AND Password = '999999'";

    $result = mysqli_query($conn, $sql);

    if(mysqli_num_rows($result) == 1){
        echo '登入成功';
    }else{
        echo '登入失敗';
    }

?>

上面測試成功後,把登入的帳號跟密碼用變數取代,再用 Postman 測試有沒有成功。

mysqli_num_rows($result) == 1 這裡的判斷值也改成 truefalse ,讓前端去處理要顯示什麼東西。

<?php
    $p_username = $_POST["Username"];
    $p_password = $_POST["Password"];

    $servername = "localhost";
    $username = "member";
    $password = "123456";
    $dbname = "member";

    $conn = mysqli_connect($servername, $username, $password, $dbname);
    if(!$conn){
        die('連線失敗'.mysqli_connect_error($conn));
    }

    $sql = "SELECT * FROM usermember WHERE Username = '$p_username' AND Password = '$p_password'";

    $result = mysqli_query($conn, $sql);

    if(mysqli_num_rows($result) == 1){
        echo true;
    }else{
        echo false;
    }
?>

成功之後就開始用 Ajax 寫串接啦~ password: $("#Password").val() 是取得前端畫面輸入框的值跟資料庫做對比,if(data) 是判斷登入成功之後執行什麼事情。

<script>
        $(function(){
            $("#btn_login").bind("click", login);

            function login(){
                $.ajax({
                    url: '20200526-login.php',
                    type: 'POST',
                    dataType: 'json',
                    data: {username:$("#username").val(), password: $("#Password").val()},
                    success: show,
                    error: function(){
                        alert('連線錯誤');
                    }

                })
            }
        });

        function show(data){
            if(data){
                alert('登入成功');
                location.href = "20200526-member-list.html";
            }else{
                alert('登入失敗');
            };
        };
    </script>

在開始新增或是測試帳號有沒有重複,要先記得把資料庫重複的資料清空,判斷才會正確喔!
$_POST["Username"] 的值要跟資料庫的名稱相同。


#PHP







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