品質管理機能を備えたERP（基幹業務システム）システムを構築するためのPHP開発

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 添加产品信息
function addProduct($name, $price, $quantity) {
    global $conn;
    $sql = "INSERT INTO products (name, price, quantity) VALUES ('$name', $price, $quantity)";
    mysqli_query($conn, $sql);
}

// 查询产品信息
function getProduct($id) {
    global $conn;
    $sql = "SELECT * FROM products WHERE id = $id";
    $result = mysqli_query($conn, $sql);
    return mysqli_fetch_assoc($result);
}

// 修改产品信息
function updateProduct($id, $name, $price, $quantity) {
    global $conn;
    $sql = "UPDATE products SET name = '$name', price = $price, quantity = $quantity WHERE id = $id";
    mysqli_query($conn, $sql);
}
?>

// 设置产品质量状态
function setQualityStatus($id, $status) {
    global $conn;
    $sql = "UPDATE products SET quality_status = '$status' WHERE id = $id";
    mysqli_query($conn, $sql);
}

// 获取产品质量状态
function getQualityStatus($id) {
    global $conn;
    $sql = "SELECT quality_status FROM products WHERE id = $id";
    $result = mysqli_query($conn, $sql);
    $row = mysqli_fetch_assoc($result);
    return $row['quality_status'];
}

// 获取合格产品列表
function getQualifiedProducts() {
    global $conn;
    $sql = "SELECT * FROM products WHERE quality_status = '合格'";
    $result = mysqli_query($conn, $sql);
    $products = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $products[] = $row;
    }
    return $products;
}

// 获取不合格产品列表
function getUnqualifiedProducts() {
    global $conn;
    $sql = "SELECT * FROM products WHERE quality_status = '不合格'";
    $result = mysqli_query($conn, $sql);
    $products = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $products[] = $row;
    }
    return $products;
}

// 按产品质量状态进行排序
function sortProductsByQualityStatus() {
    global $conn;
    $sql = "SELECT * FROM products ORDER BY quality_status ASC";
    $result = mysqli_query($conn, $sql);
    $products = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $products[] = $row;
    }
    return $products;
}