這個自己的小項目要先告一段落了。可能還有許多bug。請見諒
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刪除學生功能
PHP:
// 這里是通過前端代碼HTML中的 url 傳過來的,用 $_GET 來獲取(相關HTML代碼可以看一下到主頁看一下前幾條博客)
if (empty($_GET['num'])) exit('<h1>找不到您要刪除的學生的學號</h1>');$num = $_GET['num'];$connection = mysqli_connect('localhost', 'root', '密碼', 'students_info_system');if (!$connection) exit('<h1>連接數據庫失敗</h1>');$query = mysqli_query($connection, "delete from students where num = {$num}");if (!$query) exit('<h1>該學生信息查詢失敗</h1>');// 注意:這里傳入的是連接對象 $affected_rows = mysqli_affected_rows($connection);if ($affected_rows !== 1) exit('<h1>刪除失敗</h1>');header('Location: student_info.php');
編輯學生功能(整體上和添加學生功能差不到,稍微有些許變化)
HTML:
<!DOCTYPE html> <html> <head><meta charset="utf-8"><title>編輯學生</title><link rel="stylesheet" type="text/css" href="css/Bootstrap.css"> </head> <body><div class="container mt-3"><h1 class="display-5 text-center">編輯學生</h1><?php if (isset($error_msg)): ?><div class="alert alert-danger"><?php echo $error_msg; ?></div><?php endif ?><div class="row mt-3"><img src="<?php echo $current_student['photo']; ?>" alt="<?php echo $current_student['name']; ?>" width="100" height="488" class="col-sm-6"><form action="<?php echo $_SERVER['PHP_SELF']; ?>?id=<?php echo $current_num; ?>" method="post" enctype="multipart/form-data" autocomplete="off" class="col-sm-6"><div class="form-group"><input type="number" name="num" class="form-control" placeholder="學號" value="<?php echo isset($_POST['num']) ? $_POST['num'] : $current_student['num']; ?>"></div><div class="form-group"><select class="form-control" name="system"><option>請選擇學院/系</option><option <?php echo $current_student['system'] === '電氣工程學院' ? 'selected' : ''; ?>>電氣工程學院</option><option <?php echo $current_student['system'] === '信息工程與藝術學院' ? 'selected' : ''; ?>>信息工程與藝術學院</option><option <?php echo $current_student['system'] === '國際教育學院' ? 'selected' : ''; ?>>國際教育學院</option><option <?php echo $current_student['system'] === '水利水電工程學院' ? 'selected' : ''; ?>>水利水電工程學院</option><option <?php echo $current_student['system'] === '測繪與市政工程學院' ? 'selected' : ''; ?>>測繪與市政工程學院</option><option <?php echo $current_student['system'] === '馬克思主義學院' ? 'selected' : ''; ?>>馬克思主義學院</option><option <?php echo $current_student['system'] === '建筑工程學院' ? 'selected' : ''; ?>>建筑工程學院</option><option <?php echo $current_student['system'] === '經濟與管理學院' ? 'selected' : ''; ?>>經濟與管理學院</option></select></div><div class="form-group"><input type="text" name="class" class="form-control" placeholder="班級" value="<?php echo isset($_POST['class']) ? $_POST['class'] : $current_student['class']; ?>"></div><div class="form-group"><input type="text" name="name" class="form-control" placeholder="姓名" value="<?php echo isset($_POST['name']) ? $_POST['name'] : $current_student['name']; ?>"></div><div class="form-group"><select class="form-control" name="gender"><option value="-1">請選擇性別</option><option <?php echo $current_student['gender'] === '1' ? 'selected' : ''; ?> value="1">男</option><option <?php echo $current_student['gender'] === '0' ? 'selected' : ''; ?> value="0">女</option></select></div><div class="form-group"><label for="birthday">出生日期</label><input type="date" name="birthday" class="form-control" id="birthday" value="<?php echo isset($_POST['birthday']) ? $_POST['birthday'] : $current_student['birthday']; ?>"></div><div class="form-group"><label for="photo">照片</label><input type="file" name="photo" class="form-control"></div><button type="submit" class="btn btn-info btn-block">確認修改</button></form></div></div> </body> </html>
PHP:
if (empty($_GET['id'])) exit('<h1>必須指定相應的學號</h1>');$current_num = $_GET['id'];$connection = mysqli_connect('localhost', 'root', '密碼', 'students_info_system');if (!$connection) exit('<h1>連接數據庫失敗</h1>');$query = mysqli_query($connection, "select * from students where num = {$current_num} limit 1");if (!$query) exit('<h1>找不到您要編輯的學生信息</h1>');$current_student = mysqli_fetch_assoc($query);// var_dump($current_student);function edit_student() {// var_dump('進來了');global $connection;global $current_num; // 當前學生學號global $current_student;$extra_students_query = mysqli_query($connection, "select * from students where num != {$current_num}");if (!$extra_students_query) {exit('<h1>其余學生數據查詢失敗</h1>');// return; }// 查詢除該學生以外的其他學生while ($student = mysqli_fetch_assoc($extra_students_query)) {// var_dump($student);$students_num[] = $student['num'];}// var_dump($students_num);// var_dump($_FILES['photo']);// var_dump($_POST['gender']);if (empty($_POST['num'])) {$GLOBALS['error_msg'] = '請輸入學號';return;}// 判斷該學號是否已經被添加(即列表中已存在該學生)=========if (in_array($_POST['num'], $students_num)) {$GLOBALS['error_msg'] = '該學生已存在';return;}if (empty($_POST['system']) || $_POST['system'] === '請選擇學院/系') {$GLOBALS['error_msg'] = '請選擇學院/系';return;}if (empty($_POST['class'])) {$GLOBALS['error_msg'] = '請輸入班級';return;}if (empty($_POST['name'])) {$GLOBALS['error_msg'] = '請輸入姓名';return;}if (!(isset($_POST['gender']) && $_POST['gender'] !== '-1')) {$GLOBALS['error_msg'] = '請選擇性別';return;}if (empty($_POST['birthday'])) {$GLOBALS['error_msg'] = '請輸入出生日期';return;}// 以下處理文件域=======================================================// 當有文件上傳時才驗證,沒有上傳則照片不變// $_FILES['photo'] = $current_student['photo'];// var_dump($_FILES['photo']);if ($_FILES['photo']['name'] !== '') {// var_dump($_FILES['photo']);// var_dump($_FILES['photo']);if ($_FILES['photo']['error'] !== UPLOAD_ERR_OK) {$GLOBALS['error_msg'] = '上傳照片失敗';return;}// 驗證上傳文件的類型(只允許圖片)if (strpos($_FILES['photo']['type'], 'image/') !== 0) {$GLOBALS['error_msg'] = '這不是支持的文件格式類型,請重新上傳';return;}// 文件上傳到了服務端開辟的一個臨時地址,需要轉移到本地$image_target = 'images/' . $_FILES['photo']['name'];if (!move_uploaded_file($_FILES['photo']['tmp_name'], $image_target)) {$GLOBALS['error_msg'] = '圖片上傳失敗';return;}// 接收更新過的學生照片$current_student['photo'] = (string)$image_target;} else {// var_dump($_FILES['photo']);// 如果照片沒有上傳則不進行驗證文件域,直接更新數據且不改變原來的照片$current_student['num'] = $_POST['num'];$current_student['system'] = $_POST['system'];$current_student['class'] = $_POST['class'];$current_student['name'] = $_POST['name'];$current_student['gender'] = $_POST['gender'];$current_student['birthday'] = $_POST['birthday'];}// var_dump($current_num);// 將數據修改存放到數據庫$update_query = mysqli_query($connection, "update students set `num` = '{$current_student['num']}', `system` = '{$current_student['system']}', `class` = '{$current_student['class']}', `name` = '{$current_student['name']}', `gender` = '{$current_student['gender']}', `birthday` = '{$current_student['birthday']}', `photo` = '{$current_student['photo']}' where `num` = {$current_num}");if (!$update_query) {$GLOBALS['error_msg'] = '更新數據查詢失敗';return;}$affected_rows = mysqli_affected_rows($connection);if ($affected_rows !== 1) {$GLOBALS['error_msg'] = '修改失敗';return;}// 延遲2秒time_sleep_until(time() + 2);header('Location: student_info.php'); }if ($_SERVER['REQUEST_METHOD'] === 'POST') {edit_student(); }
搜索功能(用js)
// 關鍵詞搜索功能----立即函數 (function (element, search_key) {let table = document.getElementById('table-content'); // 獲取表格function in_array_item (item, array) {for (var i = 0; i < array.length; i++) {if (array[i].indexOf(item) != -1) {return true;}}return false;}function response () {let hiddenStudentsNumber = 0; // 獲取隱藏的學生個數(即表格隱藏行數)// 獲取要搜索的關鍵詞const search_content = document.getElementById(search_key).value;// console.log(search_content);// console.log(typeof(search_content)); let data = [];// 遍歷列表將數據存儲到一個數組中// 1.獲取表格行數for (let i = 0; i < table.children.length; i++) {// 2.獲取表格列數for (let j = 0; j < table.children[i].children.length; j++) {if (!data[i]) {// 在數組中創鍵每一行內容存放的數組,用于存放一行數據data[i] = new Array();}data[i][j] = table.children[i].children[j].innerHTML.toString();// 3.存放數據if (data[i][j] === '♂') {data[i][j] = '男';}if (data[i][j] === '♀') {data[i][j] = '女';}}// console.log(data[i]);if (search_content == '') {table.children[i].style.display = '';} else {if (in_array_item(search_content, data[i])) {table.children[i].style.display = '';} else {table.children[i].style.display = 'none';hiddenStudentsNumber += 1;}}}console.log(hiddenStudentsNumber);let str = "共有" + (table.children.length - hiddenStudentsNumber) + "名學生";document.getElementById('students_number').innerHTML = str;}const searchButton = document.getElementById(element);searchButton.addEventListener('click', function () {response();});document.addEventListener('keydown', function (event) {if (event.keyCode === 13) {response();}});let str = "共有" + table.children.length + "名學生";document.getElementById('students_number').innerHTML = str; })('search', 'search-key');
同時在原有的學生信息頁面HTML添加:
<div class="row mt-3"><a class="btn btn-info col-sm-2" style="margin-right: 28px; margin-left: 15px;" href="add_student.php">添加學生</a>
// 添加的<button class="btn btn-info align-middle" id="students_number"></button>
<input type="text" class="form-control col-sm-6 ml-2" autocomplete="on" placeholder="請輸入關鍵詞" value="" id="search-key"><button type="submit" class="btn btn-info col-sm-2 ml-2" id="search">點擊搜索</button></div>