在PHP SQL中添加数据库中的产品，并使用Bootstrap网格系统显示

<?php
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
?>

CREATE TABLE products (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    price DECIMAL(10,2) NOT NULL,
    description TEXT
);

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $price = $_POST["price"];
    $description = $_POST["description"];

    // 准备插入语句
    $sql = "INSERT INTO products (name, price, description) VALUES ('$name', $price, '$description')";

    if ($conn->query($sql) === TRUE) {
        echo "产品添加成功";
    } else {
        echo "添加产品时出错: " . $conn->error;
    }
}
?>

<form method="POST" action="<?php echo $_SERVER["PHP_SELF"]; ?>">
    <div class="form-group">
        <label for="name">产品名称:</label>
        <input type="text" class="form-control" id="name" name="name" required>
    </div>
    <div class="form-group">
        <label for="price">产品价格:</label>
        <input type="number" step="0.01" class="form-control" id="price" name="price" required>
    </div>
    <div class="form-group">
        <label for="description">产品描述:</label>
        <textarea class="form-control" id="description" name="description" rows="3"></textarea>
    </div>
    <button type="submit" class="btn btn-primary">添加产品</button>
</form>

<?php
// 查询所有产品
$sql = "SELECT * FROM products";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "<div class='row'>";
        echo "<div class='col-md-4'>" . $row["name"] . "</div>";
        echo "<div class='col-md-4'>" . $row["price"] . "</div>";
        echo "<div class='col-md-4'>" . $row["description"] . "</div>";
        echo "</div>";
    }
} else {
    echo "暂无产品";
}
?>