未插入数据。我在php中哪里出了问题？

我已经彻底检查了我的数据库、表和列名是否都正确。我的数据仍然没有被插入

以下是我的PHP代码：

        $servername = "localhost";
        $username = "root";
        $password = "";
        $dbname = "thehealthsync";

        // Create connection
        $conn = mysqli_connect($servername, $username, $password, $dbname);
        // Check connection
        if (!$conn) {
            die("Connection failed: " . mysqli_connect_error());
        }
        if(isset($_POST["t12"]))
            {
                $firstname = $_POST["t4"];
                $lastname = $_POST["t5"];
                $gender = $_POST["t6"];
                $pin = $_POST["t7"];
                $address = $_POST["t8"];
                $email = $_POST["t9"];
                $password = $_POST["t10"];
                $conpass = $_POST["t11"];
                if(!empty($firstname) && !empty($lastname) && !empty($gender) && !empty($pin) && !empty($address) && !empty($email) && !empty($password) && !empty($conpass))
                {
                    if($password == $conpass)
                    {
                        $sql = "INSERT INTO userdata (firstname, lastname, gender, pin, address, email, password)
                        VALUES ('$firstname', '$lastname', '$gender', '$pin', '$address', '$email', '$password')";
                    }
                    else{
                        echo 'Password did not match';
                    }
                }
                else{
                    echo 'Some fields are empty';
                }
            }
            $conn->close();
?>

---

您从不将查询发送到数据库，只设置了一个

$sql

变量。您必须调用

mysqli\u query

才能实际执行查询。

由于您不执行查询，因此不会插入查询。后sql字符串

$sql = "INSERT INTO userdata (firstname, lastname, gender, pin, address, email, password)
                    VALUES ('$firstname', '$lastname', '$gender', '$pin', '$address', '$email', '$password')";

加

---

伙计，把

mysqli\u查询（$sql）

放在

$sql

code

发布你的html表单，请开始调试它。并显示您的post值通过添加代码对其进行bug:die（$sql）；在你询问之后。它用于确保条件是否通过，并在浏览器中显示您的真实查询。

mysqli_query($conn, $sql);