PHP开发的二手回收网站提供库存管理功能

<?php
$host = "localhost";
$username = "root";
$password = "";
$database = "inventory";

$conn = mysqli_connect($host, $username, $password, $database);

// 检查数据库连接是否成功
if (!$conn) {
    die("数据库连接失败：" . mysqli_connect_error());
}
?>

<?php
include "config.php";

$name = $_POST['name'];
$description = $_POST['description'];
$quantity = $_POST['quantity'];

// 插入物品信息到数据库
$sql = "INSERT INTO inventory (name, description, quantity) VALUES ('$name', '$description', $quantity)";
if (mysqli_query($conn, $sql)) {
    echo "物品添加成功！";
} else {
    echo "物品添加失败：" . mysqli_error($conn);
}

mysqli_close($conn);
?>

<?php
include "config.php";

// 查询库存信息
$sql = "SELECT * FROM inventory";
$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        echo "物品ID: " . $row['id'] . "<br>";
        echo "名称: " . $row['name'] . "<br>";
        echo "描述: " . $row['description'] . "<br>";
        echo "库存数量: " . $row['quantity'] . "<br><br>";
    }
} else {
    echo "库存为空！";
}

mysqli_close($conn);
?>

<?php
include "config.php";

$id = $_GET['id'];
$quantity = $_GET['quantity'];

// 更新库存信息
$sql = "UPDATE inventory SET quantity = $quantity WHERE id = $id";
if (mysqli_query($conn, $sql)) {
    echo "库存更新成功！";
} else {
    echo "库存更新失败：" . mysqli_error($conn);
}

mysqli_close($conn);
?>

<?php
include "config.php";

$id = $_GET['id'];

// 删除物品
$sql = "DELETE FROM inventory WHERE id = $id";
if (mysqli_query($conn, $sql)) {
    echo "物品删除成功！";
} else {
    echo "物品删除失败：" . mysqli_error($conn);
}

mysqli_close($conn);
?>