构建销售统计功能的企业资源计划（ERP）系统的PHP开发

<?php
$host = 'localhost';
$dbname = 'erp';
$username = 'root';
$password = '';

try {
    $pdo = new PDO("mysql:host=$host;dbname=$dbname;charset=utf8", $username, $password);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
    die('Database connection failed: ' . $e->getMessage());
}
?>

<?php
// 插入销售订单
$sql = "INSERT INTO sales_orders (order_no, customer_id, order_date) VALUES (?, ?, ?)";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $order_no);
$stmt->bindParam(2, $customer_id);
$stmt->bindParam(3, $order_date);
$stmt->execute();

// 查询销售订单
$sql = "SELECT * FROM sales_orders";
$stmt = $pdo->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);

// 更新销售订单详情
$sql = "UPDATE sales_order_details SET quantity = ? WHERE order_id = ? AND product_id = ?";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $quantity);
$stmt->bindParam(2, $order_id);
$stmt->bindParam(3, $product_id);
$stmt->execute();

// 删除销售订单
$sql = "DELETE FROM sales_orders WHERE order_id = ?";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $order_id);
$stmt->execute();
?>

<?php
$sql = "SELECT DATE_FORMAT(order_date, '%Y-%m') AS month, SUM(total_amount) AS sales_amount FROM sales_orders WHERE order_date BETWEEN ? AND ? GROUP BY month";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $start_date);
$stmt->bindParam(2, $end_date);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>

<?php
$sql = "SELECT customers.customer_id, customers.name, SUM(sales_orders.total_amount) AS sales_amount FROM customers JOIN sales_orders ON customers.customer_id = sales_orders.customer_id WHERE sales_orders.order_date BETWEEN ? AND ? GROUP BY customers.customer_id";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $start_date);
$stmt->bindParam(2, $end_date);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>

<?php
$sql = "SELECT products.product_id, products.name, SUM(sales_order_details.quantity) AS sales_quantity FROM products JOIN sales_order_details ON products.product_id = sales_order_details.product_id JOIN sales_orders ON sales_order_details.order_id = sales_orders.order_id WHERE sales_orders.order_date BETWEEN ? AND ? GROUP BY products.product_id";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $start_date);
$stmt->bindParam(2, $end_date);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>