当我再次重新加载页面时，从$_POST插入数据

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

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 从$_POST获取数据
$data1 = $_POST['field1'];
$data2 = $_POST['field2'];
// ...

// 构建插入数据的SQL语句
$sql = "INSERT INTO your_table_name (field1, field2) VALUES ('$data1', '$data2')";
// ...

// 执行插入操作
if ($conn->query($sql) === TRUE) {
    echo "数据插入成功";
} else {
    echo "数据插入失败: " . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>