将用户输入从文本框插入数据库（使用mysql从PHP到PHPMYADMIN）代码由于某些原因不起作用

Question

For some reason I am getting "Notice: Undefined index: adata" when I try to input data and mysql data file gets a blank space input (no text input just an empty field. 由于某些原因，当我尝试输入数据时，我得到“通知：未定义的索引：adata”，而mysql数据文件得到一个空格输入（没有文本输入，只是一个空字段。

So can you tell me guys what I did wrong, because I watched multiple tutorials, guide and read multiple posts regarding this matter yet still I could not resolve it. 因此，您能告诉我我做错了什么吗，因为我看了多个教程，指导并阅读了有关此问题的多篇文章，但仍然无法解决。

<?php

if (isset($_POST['submit']))
{

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

// Create connection
$dbcon = mysqli_connect($servername, $username, $password, $dbname);
mysql_select_db($db);
// Check connection
    $adata = $_POST['test'];
    $sql = ("INSERT INTO data (data) VALUES ('$adata')");

    if (!mysqli_query($conn, $sqlinsert)) {
        die('error inserting new data');    
    } //end of second if

} //end of if statement


?>
<html>
<head>
<meta charset="UTF-8">
<title>Insert Data Into DB</title>
</head>
<body>
<h1>Insert new data into DB</h1>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
Add Data:
<input type="text" name="test">
<br />
<input type="submit" value="add new data" />

</form>

</body>
</html>

Answer 1

Be careful with your variables ; 注意变量;

$adata = $_POST['test'];
$sql = ("INSERT INTO data (data) VALUES ('$adata')");

if (!mysqli_query($conn, $sql)) { // it was $sqlinsert and must be $sql due your definition.
    die('error inserting new data');

将用户输入从文本框插入数据库（使用mysql从PHP到PHPMYADMIN）代码由于某些原因不起作用

问题描述

1 个解决方案

解决方案1
2

将用户输入从文本框插入数据库（使用mysql从PHP到PHPMYADMIN）代码由于某些原因不起作用

问题描述

1 个解决方案

解决方案1 2

解决方案1
2