mysql 生成网页报表

CREATE TABLE sales (
    id INT AUTO_INCREMENT PRIMARY KEY,
    product VARCHAR(100),
    quantity INT,
    sale_date DATE
);

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询数据
$sql = "SELECT product, SUM(quantity) as total_quantity FROM sales GROUP BY product";
$result = $conn->query($sql);

// 生成 HTML 报表
echo "<h1>销售报表</h1>";
echo "<table border='1'>";
echo "<tr><th>产品</th><th>总数量</th></tr>";
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "<tr><td>" . $row["product"] . "</td><td>" . $row["total_quantity"] . "</td></tr>";
    }
} else {
    echo "<tr><td colspan='2'>没有数据</td></tr>";
}
echo "</table>";

// 关闭连接
$conn->close();
?>