我没有收到任何错误，但数据没有进入 wamp 上的数据库

Question

我正在尝试将用户输入表单中的数据获取到我的 wamp 服务器中。我尝试过加载不同的方法和编码，但没有一个可以工作并提交数据。你能帮我吗？我只做了一周的网页设计和数据库。

<?php

 $username = "root";
    $password = "";
    $hostname = "localhost";
    $database = "project";



//connection to the server
    $dbhandle = mysqli_connect($hostname, $username, $password)
      or die ("Unable to connect to server<br>");
      echo  "Connected to server<br>";

      //connection to the database
    $select_db = mysqli_select_db($dbhandle, $database)
    or die ("Could not select Project database");
    echo "connected to database";


//Getting the Values from the form
$Firstname = $_POST["Firstname"];
  $Lastname = $_POST["Lastname"];
  $DOB = $_POST["DOB"];
  $Address = $_POST["Address"];
  $Telephone_No = $_POST["Telephone_No"];
  $NOK = $_POST["NOK"];
  $NOK_Address = $_POST["NOK_Address"];
  $vetting_date = $_POST["vetting_date"];
  $Clearance_Expiry = $_POST["Clearance_Expiry"];
  $Current_Employer = $_POST["Current_Employer"];
  $Resubmission = $_POST["Resubmission"];
  $Number_of_Attempts = isset($_POST["Number_of_Attempts"]) ? $_POST["Number_of_Attempts"] : 1;
  $Qualification1 = $_POST["Qual_1"];
  $date_completed_1= $_POST["date_completed_1"];
  $Expiry_date_1 = $_POST["Run_out_date_1"];
  $Qualification2 = $_POST["Qual_2"];
  $date_completed_2 = $_POST["date_completed_2"];
  $Expiry_date_2 = $_POST["Run_out_date_2"];
  $Qualification3 = $_POST["Qual_3"];
  $date_completed_3 = $_POST["date_completed_3"];
  $Expiry_date_3 = $_POST["Run_out_date_3"];
  $Qualification4 = $_POST["Qual_4"];
  $date_completed_4 = $_POST["date_completed_4"];
  $Expiry_date_4 = $_POST["Run_out_date_4"];
  $Qualification5 = $_POST["Qual_5"];
  $date_completed_5 = $_POST["date_completed_5"];
  $Expiry_date_5 = $_POST["Run_out_date_5"];
  $Qualification6 = $_POST["Qual_6"];
  $date_completed_6 = $_POST["date_completed_6"];
  $Expiry_date_6 = $_POST["Run_out_date_6"];
  $Qualification7 = $_POST["Qual_7"];
  $date_completed_7 = $_POST["date_completed_7"];
  $Expiry_date_7 = $_POST["Run_out_date_7"];
  $Qualification8 = $_POST["Qual_8"];
  $date_completed_8 = $_POST["date_completed_8"];
  $Expiry_date_8 = $_POST["Run_out_date_8"];
  $Qualification9 = $_POST["Qual_9"];
  $date_completed_9 = $_POST["date_completed_9"];
  $Expiry_date_9 = $_POST["Run_out_date_9"];
  $Qualification10 = $_POST["Qual_10"];
  $date_completed_10 = $_POST["date_completed_10"];
  $Expiry_date_10 = $_POST["Run_out_date_10"];
  $why = $_POST["why"];


//inserting to the database

$query = "INSERT INTO `applicant` (`Firstname`, `Lastname`, `DOB`, `Address`, `Telephone_No`, `NOK`, `NOK_Address`, `vetting_date`, `Clearance_Expiry`, `Current_Employer`, `Resubmission`, `Number_of_Attempts`, `Why`) 
        VALUES (`$_POST[Firstname]`,`$_POST[Lastname]`,`$_POST[DOB]`,`$_POST[Address]`,`$_POST[Telephone_No]`,`$NOK`,`$NOK_Address`,`$vetting_date`,`$Clearance_Expiry`,`$Current_Employer`,`$Resubmission`,`$Number_of_Attempts`,`$why`)";









  //$sql = "INSERT INTO qualification_link (date_completed) VALUES (`$date_completed_1`), (Run_out_Date) VALUES (`$Expiry_date_1`), (date_completed) VALUES (`$date_completed_2`), (Run_out_Date) VALUES (`$Expiry_date_2`), (date_completed) VALUES (`$date_completed_3`), (Run_out_Date) VALUES (`$Expiry_date_3`), (date_completed) VALUES (`$date_completed_4`), (Run_out_Date) VALUES (`$Expiry_date_4`), (date_completed) VALUES (`$date_completed_5`), (Run_out_Date) VALUES (`$Expiry_date_5`), (date_completed) VALUES (`$date_completed_6`), (Run_out_Date) VALUES (`$Expiry_date_6`), (date_completed) VALUES (`$date_completed_7`), (Run_out_Date) VALUES (`$Expiry_date_7`), (date_completed) VALUES (`$date_completed_8`), (Run_out_Date) VALUES (`$Expiry_date_8`), (date_completed) VALUES (`$date_completed_9`), (Run_out_Date) VALUES (`$Expiry_date_9`), (date_completed) VALUES (`$date_completed_10`), (Run_out_Date) VALUES (`$Expiry_date_10`)";
 // $sql = "INSERT INTO qualification (Qual_1) VALUES (`$Qualification1`), (Qual_2) VALUES (`$Qualification2`), (Qual_3) VALUES (`$Qualification3`), (Qual_4) VALUES (`$Qualification4`), (Qual_5) VALUES (`$Qualification5`), (Qual_6) VALUES (`$Qualification6`), (Qual_7) VALUES (`$Qualification7`), (Qual_8) VALUES (`$Qualification8`), (Qual_9) VALUES (`$Qualification9`), (Qual_10) VALUES (`$Qualification10`)";



 // successfully insert data into database, displays message "Successful".
 if($query){
  echo "Successful";
 echo "<BR>";
 echo "<a href=index.php>Back to Home page</a>";
}

  else {
  echo "Data not Submitted";
}

//closing the connection
   mysqli_close($dbhandle)

   ?>

Answer 1

正如我最初所说的，您使用了错误的 identifiers 作为您的 VALUES，即反引号。它们应该是引号。

另外，你不是在查询。

这是你需要做的：

确保所有的表单元素都包含一个 name 属性和一个 post 方法；看到您没有发布您的表格，所以我需要指出这一点。

使用mysqli_query()，你没用过的东西；它是执行查询所必需的。

$result = mysqli_query($dbhandle, $query) 
    or die(mysqli_error($dbhandle));

if($result){ echo "Success!"; }

  else{ echo "Error."; }

现在，您已经定义了变量，那么为什么要在查询中使用$_POST['var']？只需使用变量。

将您的 VALUES 变量放在单引号中：

VALUES ('$Firstname','$Lastname', .....

其余的也一样。

清理您的输入：

$Firstname = stripslashes($_POST["Firstname"]);
$Firstname = mysqli_real_escape_string($dbhandle, $_POST["Firstname"]);

其余的也一样。

如果您收到“未定义索引...”警告，那是因为表单元素可能没有命名，或者包含拼写错误。字母大小写很重要。

不过，我强烈建议您使用prepared statements 或PDO with prepared statements，它们更安全。

将error reporting 添加到文件顶部，这将有助于查找错误。

<?php 
error_reporting(E_ALL);
ini_set('display_errors', 1);

// rest of your code

旁注：错误报告只能在暂存阶段完成，而不能在生产阶段完成。

Answer 2

你有一个 if 声明，它什么都不做：

if($query) {
    //more of your code
}

您希望通过以下方式实际执行该查询：

if ($result = $mysqli->query($query) {
    //more of your code
}

Answer 3

你也可以替换

$query = "INSERT INTO `applicant` (`Firstname`, `Lastname`, `DOB`, `Address`, `Telephone_No`, `NOK`, `NOK_Address`, `vetting_date`, `Clearance_Expiry`, `Current_Employer`, `Resubmission`, `Number_of_Attempts`, `Why`) 
    VALUES (`$_POST[Firstname]`,`$_POST[Lastname]`,`$_POST[DOB]`,`$_POST[Address]`,`$_POST[Telephone_No]`,`$NOK`,`$NOK_Address`,`$vetting_date`,`$Clearance_Expiry`,`$Current_Employer`,`$Resubmission`,`$Number_of_Attempts`,`$why`)");

与

$query = mysqli_query($dbhandle, "INSERT INTO `applicant` (`Firstname`, `Lastname`, `DOB`, `Address`, `Telephone_No`, `NOK`, `NOK_Address`, `vetting_date`, `Clearance_Expiry`, `Current_Employer`, `Resubmission`, `Number_of_Attempts`, `Why`) 
    VALUES ("'.$_POST[Firstname].'","'.$_POST[Lastname].'","'.$_POST[DOB].'","'.$_POST[Address].'","'.$_POST[Telephone_No].'","'.$NOK.'","'.$NOK_Address.'","'.$vetting_date.'","'.$Clearance_Expiry.'","'.$Current_Employer.'","'.$Resubmission.'","'.$Number_of_Attempts.'","'.$why.'")";

Answer 4

$query = "INSERT INTO `applicant` (`Firstname`, `Lastname`, `DOB`, `Address`, `Telephone_No`, `NOK`, `NOK_Address`, `vetting_date`, `Clearance_Expiry`, `Current_Employer`, `Resubmission`, `Number_of_Attempts`, `Why`) 
    VALUES (`$_POST[Firstname]`,`$_POST[Lastname]`,`$_POST[DOB]`,`$_POST[Address]`,`$_POST[Telephone_No]`,`$NOK`,`$NOK_Address`,`$vetting_date`,`$Clearance_Expiry`,`$Current_Employer`,`$Resubmission`,`$Number_of_Attempts`,`$why`)";

应该是

$query = "INSERT INTO `applicant` (`Firstname`, `Lastname`, `DOB`, `Address`, `Telephone_No`, `NOK`, `NOK_Address`, `vetting_date`, `Clearance_Expiry`, `Current_Employer`, `Resubmission`, `Number_of_Attempts`, `Why`) 
VALUES ('" .$_POST['Firstname']. "', '" .$_POST['Lastname']. "', '" .$_POST['DOB']. "', '" .$_POST['Address']. "', '" .$_POST['Telephone_No']. "', '" .$NOK. "', '" .$NOK_Address. "', '" .$vetting_date. "', '" .$Clearance_Expiry. "', '" .$Current_Employer. "', '" .$Resubmission. "', '" .$Number_of_Attempts. "', '" .$why."');";

然后你需要添加这个：

$attempt = mysqli_query($dbhandle , $query);

# You will then need to check $attempt to see if it was true or not.
if($attempt) {
    # Query executed successfully
} else {
    # Whoops, it's failed!
}