PHP没有将数据插入MySQL但没有显示错误

Question

我正在尝试使用 PHP 和 HTML 表单将数据输入到 MySQL 数据库中，但数据并未保存到数据库中，即使它显示已保存。请告诉我如何确保表单条目保存到数据库中。

HTML

<form action="newproduct.php" method="post">
<table>
<tr>
<td>Username</td>
<td><input name="user" type="text"></td>
</tr> ...

<button type="submit">Go</button>
</form>

PHP

<?php
$servername = "localhost";
$username = $_POST["user"];
$password = $_POST["pass"];
$dbname = "bakefree_products";

$conn = mysqli_connect($servername, $username, $password, $dbname);
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
  
$sql = "INSERT INTO ".$_POST["range"]." (productname, image, frompricesize, paypalcode, productdesc, allergystandard, allergyglutenfree, allergyvegan, allergygfvegan)
VALUES ('".$_POST["productname"]."', '".$_POST["image"]."', '".$_POST["frompricesize"]."', '".$_POST["paypalcode"]."', '".$_POST["productdesc"]."', '".$_POST["allergystandard"]."', '".$_POST["allergyglutenfree"]."', '".$_POST["allergyvegan"]."', '".$_POST["allergygfvegan"]."')";

    
        
if (mysqli_query($conn, $sql)) {
    echo "New product created successfully.";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
    
//show new number of products
$sql = "SELECT * FROM".$_POST["range"];
$result = $conn->query($sql);
if ($result->num_rows > 0) {echo "There are ".$result->num_rows ." products.";
} else {
    echo "<br><br>There are no products in ".$_POST["range"];
}
    
mysqli_close($conn);
?>

结果

新产品创建成功。

TEST 中没有产品

Answer 1

实际上插入应该可以正常工作，但您需要在此处检查选择查询的语法，

//show new number of products
$sql = "SELECT * FROM ".$_POST["range"]; // Added a space after `FROM`

它应该正确地获取数据并向你显示字符串There are X products.