解決庫MySQLi空查詢錯誤

Question

警告接收：

警告：mysqli的::查詢（）：空查詢在C：\瓦帕\ WWW \ OTP-任務\的welcome.php在線路62上

我的數據庫連接是在這裏：

function insertDB($email, $OTP , $phonenumber) 
{ 
    $servername = "localhost"; 
    $username = "root"; 
    $password = ""; 
    $db = "dbotp"; 

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

    if ($conn->connect_error) { 
     die("Connection failed: " . $conn->connect_error); 
    } 

    // insert to db and close the connection, default time attribute is 60 mins 
    // the table name is onetime and will hold the otp and phonenum and email 

    $res = mysqli_query($conn, "INSERT INTO onetime (otpnum,email,phoneNum,action) VALUES ('$OTP' , '$email' , '$phonenumber','success')"); 


    // $res = "INSERT INTO onetime (otpnum,email,phoneNum,action) VALUES ('$OTP' , '$email' , '$phonenumber', 'success')"; 


    if ($conn->query($res) === TRUE) { 
     echo "New record created successfully"; 
    } else { 
     echo "Error: " . $res . "<br>" . $conn->error; 
    } 

    $conn->close(); 
} 

Answer 1

以下兩個只是同一事物的不同格式：

$conn->query(...) 

和

mysqli_query($conn, ...) 

一旦執行其中的一個，使用它的返回值，而不是重新執行查詢：

$res = $conn->query(...) 
if ($res) { 
    // ... 
} 

也請閱讀準備的語句：http://php.net/manual/en/mysqli-stmt.prepare.php