PHP 제품 재고 관리 시스템을 통해 재고 회전율을 향상시키는 방법

<?php
$query = "SELECT * FROM item";
// 执行查询语句，获取结果集
$result = mysqli_query($conn, $query);

// 遍历结果集，输出商品列表
while($row = mysqli_fetch_assoc($result)) {
    echo $row['name'] . " - ￥" . $row['price'] . "<br>";
}

// 释放结果集
mysqli_free_result($result);
?>

<?php
if($_POST) {
    $name = $_POST['name'];
    $price = $_POST['price'];
    $category_id = $_POST['category_id'];
    
    $query = "INSERT INTO item (name, price, category_id) VALUES ('$name', '$price', '$category_id')";
    // 执行添加商品语句
    mysqli_query($conn, $query);
}
?>

<form action="" method="POST">
    商品名称：<input type="text" name="name"><br>
    商品价格：<input type="text" name="price"><br>
    所属分类：
    <select name="category_id">
        <?php
        $categoryQuery = "SELECT * FROM category";
        // 执行查询语句，获取结果集
        $categoryResult = mysqli_query($conn, $categoryQuery);

        // 遍历结果集，输出分类下拉列表
        while($categoryRow = mysqli_fetch_assoc($categoryResult)) {
            echo "<option value='" . $categoryRow['id'] . "'>" . $categoryRow['name'] . "</option>";
        }

        // 释放结果集
        mysqli_free_result($categoryResult);
        ?>
    </select><br>
    <input type="submit" value="添加商品">
</form>

<?php
$query = "SELECT i.name, i.price, c.name AS category, inv.stock, inv.sale FROM item AS i INNER JOIN category AS c ON i.category_id = c.id INNER JOIN inventory AS inv ON i.id = inv.item_id";
// 执行查询语句，获取结果集
$result = mysqli_query($conn, $query);

// 遍历结果集，输出库存列表
while($row = mysqli_fetch_assoc($result)) {
    echo $row['name'] . " - ￥" . $row['price'] . " - " . $row['category'] . " - 库存：" . $row['stock'] . " - 销售：" . $row['sale'] . "<br>";
}

// 释放结果集
mysqli_free_result($result);
?>

<?php
if($_POST) {
    $item_id = $_POST['item_id'];
    $stock_change = $_POST['stock_change'];
    
    $query = "SELECT * FROM inventory WHERE item_id = $item_id";
    // 执行查询语句，获取结果集
    $result = mysqli_query($conn, $query);
    $row = mysqli_fetch_assoc($result);
    
    $current_stock = $row['stock'];
    $new_stock = $current_stock + $stock_change;
    
    $updateQuery = "UPDATE inventory SET stock = $new_stock WHERE item_id = $item_id";
    // 执行更新库存数量语句
    mysqli_query($conn, $updateQuery);
}
?>

<form action="" method="POST">
    商品：
    <select name="item_id">
        <?php
        $itemQuery = "SELECT * FROM item";
        // 执行查询语句，获取结果集
        $itemResult = mysqli_query($conn, $itemQuery);

        // 遍历结果集，输出商品下拉列表
        while($itemRow = mysqli_fetch_assoc($itemResult)) {
            echo "<option value='" . $itemRow['id'] . "'>" . $itemRow['name'] . "</option>";
        }

        // 释放结果集
        mysqli_free_result($itemResult);
        ?>
    </select><br>
    库存变更：<input type="text" name="stock_change"><br>
    <input type="submit" value="修改库存">
</form>