1.分析
index.php是呈现列表，通过点击列表页上的添加和删除按钮，对列表页上面的进行操作
index.php
TODO:要将数据库里面的内容呈现到页面中
(1)连接数据库
(2)查询数据
(3)混编
<?php
//连接数据库
$connection=mysqli_connect('localhost','root','123','test');
if(!$connection){
exit('<h1>数据库连接失败</h2>');
}
//建立查询
$query = mysqli_query($connection,'select * from users;');
if(!$query){
exit('数据库查询失败');
}
//转为数组
/*while($item = mysqli_fetch_assoc($query)){
var_dump($item);
}*/
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>XXX管理系统</title>
<link rel="stylesheet" href="assets/css/bootstrap.css">
<link rel="stylesheet" href="assets/css/style.css">
</head>
<body>
<nav class="navbar navbar-expand navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="#">XXX管理系统</a>
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="index.html">用户管理</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">商品管理</a>
</li>
</ul>
</nav>
<main class="container">
<h1 class="heading">用户管理 <a class="btn btn-link btn-sm" href="add.php">添加</a></h1>
<table class="table table-hover">
<thead>
<tr>
<th><input type="checkbox" name="check[]"></th>
<th>#</th>
<th>头像</th>
<th>姓名</th>
<th>性别</th>
<th>年龄</th>
<th class="text-center" width="140">操作</th>
</tr>
</thead>
<tbody>
<?php while($item = mysqli_fetch_assoc($query)): ?>
<tr>
<th><input type="checkbox" name="check[]"></th>
<th scope="row"><?php echo $item['id']; ?></th>
<td><img src="<?php echo $item['src']; ?>" class="rounded" alt="<?php echo $item['name']; ?>"></td>
<td><?php echo $item['name']; ?></td>
<td><?php echo $item['gender'] == 0 ? '♀' : '♂'; ?></td>
<td><?php echo $item['birthday']; ?></td>
<td class="text-center">
<a class="btn btn-info btn-sm" href="edit.php?id=<?php echo $item['id'];?>">编辑</a>
<a class="btn btn-danger btn-sm" href="delete.php?id=<?php echo $item['id'];?>">删除</a>
</td>
</tr>
<?php endwhile ?>
</tbody>
</table>
<ul class="pagination justify-content-center">
<li class="page-item"><a class="page-link" href="#">«</a></li>
<li class="page-item"><a class="page-link" href="#">1</a></li>
<li class="page-item"><a class="page-link" href="#">2</a></li>
<li class="page-item"><a class="page-link" href="#">3</a></li>
<li class="page-item"><a class="page-link" href="#">»</a></li>
</ul>
</main>
</body>
</html>
add.php
DOTO:在数据库里面添加数据
(1)表单验证 (2)持久化( 3)响应
需要注意的几个问题：
(1)在单选中，value=-1默认是没有选中
<?php
function add(){
//目标：表单验证，持久化，响应
//表单验证
//验证姓名
if(empty($_POST['name'])){
$GLOBALS['error_message'] = '请输入姓名';
return ;
}
if(!(isset($_POST['gender'])&&$_POST['gender']!=='-1')){
$GLOBALS['error_message'] = '请选择性别';
return;
}
if(empty($_POST['birthday'])){
$GLOBALS['error_message'] = '请选择生日';
return;
}
$name=$_POST['name'];
$gender=$_POST['gender'];
$birthday=$_POST['birthday'];
//头像验证
if (empty($_FILES['src'])) {
$GLOBALS['error_message'] = '请上传头像';
return;
}
$ext = pathinfo($_FILES['src']['name'], PATHINFO_EXTENSION);
// => jpg
$target = '../uploads/avatar-' . uniqid() . '.' . $ext;
if (!move_uploaded_file($_FILES['src']['tmp_name'], $target)) {
$GLOBALS['error_message'] = '上传头像失败';
return;
}
$src = substr($target, 2);
//持久化，将数据保存到数据库中
//连接数据库
$connection=mysqli_connect('localhost','root','123','test');
if(!$connection){
$GLOBALS['error_message'] = '数据库连接失败';
}
$query = mysqli_query($connection, "insert into users values (null, '{$name}', {$gender}, '{$birthday}', '{$src}');");
//建立查询
if(!$query){
$GLOBALS['error_message'] = '数据库插入失败';
}
//响应
header('Location: index.php');
}
if($_SERVER['REQUEST_METHOD']=='POST'){
add();
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>XXX管理系统</title>
<link rel="stylesheet" href="assets/css/bootstrap.css">
<link rel="stylesheet" href="assets/css/style.css">
</head>
<body>
<nav class="navbar navbar-expand navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="#">XXX管理系统</a>
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="index.html">用户管理</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">商品管理</a>
</li>
</ul>
</nav>
<main class="container">
<h1 class="heading">添加用户</h1>
<?php if (isset($error_message)): ?>
<div class="alert alert-warning">
<?php echo $error_message; ?>
</div>
<?php endif ?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data" autocomplete="off">
<div class="form-group">
<label for="avatar">头像</label>
<input type="file" class="form-control" id="avatar" name="src">
</div>
<div class="form-group">
<label for="name">姓名</label>
<input type="text" class="form-control" id="name" name="name">
</div>
<div class="form-group">
<label for="gender">性别</label>
<select class="form-control" id="gender" name="gender">
<option value="-1">请选择性别</option>
<option value="1">男</option>
<option value="0">女</option>
</select>
</div>
<div class="form-group">
<label for="birthday">生日</label>
<input type="date" class="form-control" id="birthday" name="birthday">
</div>
<button class="btn btn-primary">保存</button>
</form>
</main>
</body>
</html>
edit.php
注意的问题：
(1)这里需要加上一个空格，属性和属性之间必须要有空格，
(2)如果gender=" " 这是不选中的情况，但是null==0,返回的是TRUE,
(3)<input type="text hidden>可以隐藏该表单
(4)非常重要的问题
在html中，函数里面不能使用函数外面的变量，如果要使用应该都声明为全局变量
<?php
// 接收要修改的数据 ID
if (empty($_GET['id'])) {
exit('<h1>必须传入指定参数</h1>');
}
$id = $_GET['id'];
// 1. 建立连接
$conn = mysqli_connect('localhost', 'root', '123', 'test');
if (!$conn) {
exit('<h1>连接数据库失败</h1>');
}
// 2. 开始查询
// 因为 ID 是唯一的 那么找到第一个满足条件的就不用再继续了 limit 1
$query = mysqli_query($conn, "select * from users where id = {$id} limit 1;");
if (!$query) {
exit('<h1>查询数据失败</h1>');
}
// 已经查询到的当前数据
$user = mysqli_fetch_assoc($query);
if (!$user) {
exit('<h1>找不到你要编辑的数据</h1>');
}
function edit () {
global $user;
global $conn,$query;
// 验证非空
if (empty($_POST['name'])) {
$GLOBALS['error_message'] = '请输入姓名';
return;
}
if (!(isset($_POST['gender']) && $_POST['gender'] !== '-1')) {
$GLOBALS['error_message'] = '请选择性别';
return;
}
if (empty($_POST['birthday'])) {
$GLOBALS['error_message'] = '请输入日期';
return;
}
// 取值
$user['name'] = $_POST['name'];
$user['gender'] = $_POST['gender'];
$user['birthday'] = $_POST['birthday'];
// 有上传就修改
if (isset($_FILES['src']) && $_FILES['src']['error'] === UPLOAD_ERR_OK) {
// 用户上传了新头像 -> 用户希望修改头像
$ext = pathinfo($_FILES['src']['name'], PATHINFO_EXTENSION);
$target = '../uploads/avatar-' . uniqid() . '.' . $ext;
if (!move_uploaded_file($_FILES['src']['tmp_name'], $target)) {
$GLOBALS['error_message'] = '上传头像失败';
return;
}
$user['src'] = substr($target, 2);
}
// $user => 修改过后的信息
// TODO: 将数据更新回数据库
$newdata=mysqli_query($conn,"update users set name='{$user['name']}', gender={$user['gender']},birthday='{$user['birthday']}',src='{$user['src']}' where id={$user['id']} limit 1;");
if(!$newdata){
$GLOBALS['error-message'] = '更新数据失败';
}
header('Location: index.php');
}
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
edit();
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>XXX管理系统</title>
<link rel="stylesheet" href="assets/css/bootstrap.css">
<link rel="stylesheet" href="assets/css/style.css">
</head>
<body>
<nav class="navbar navbar-expand navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="#">XXX管理系统</a>
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="index.html">用户管理</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">商品管理</a>
</li>
</ul>
</nav>
<main class="container">
<h1 class="heading">编辑“<?php echo $user['name']; ?>”</h1>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>?id=<?php echo $user['id']; ?>" method="post" enctype="multipart/form-data">
<!-- <input type="hidden" id="id" value="<?php echo $user['id']; ?>"> -->
<img src="<?php echo $user['avatar']; ?>" alt="">
<div class="form-group">
<label for="avatar">头像</label>
<!-- 文件域不能设置默认值 -->
<input type="file" class="form-control" id="avatar" name="avatar">
</div>
<div class="form-group">
<label for="name">姓名</label>
<input type="text" class="form-control" id="name" name="name" value="<?php echo $user['name']; ?>">
</div>
<div class="form-group">
<label for="gender">性别</label>
<select class="form-control" id="gender" name="gender">
<option value="-1">请选择性别</option>
<option value="1"<?php echo $user['gender'] === '1' ? ' selected': ''; ?>>男</option>
<option value="0"<?php echo $user['gender'] === '0' ? ' selected': ''; ?>>女</option>
</select>
</div>
<div class="form-group">
<label for="birthday">生日</label>
<input type="date" class="form-control" id="birthday" name="birthday" value="<?php echo $user['birthday']; ?>">
</div>
<button class="btn btn-primary">保存</button>
</form>
</main>
</body>
</html>
delete.php
<?php
$id = $_GET['id'];
//建立数据库连接
$conncetion=mysqli_connect('localhost','root','123','test');
if(!$conncetion){
exit('<h1>数据库连接失败</h1>');
}
//查询
$query=mysqli_query($conncetion,'delete from users where id='.$id.';');
if(!$query){
exit('<h1>数据库查询失败</h1>');
}
header('Location: index.php');