如何确保mysql查询字符串php中没有缺失值

我有一个php类和方法，它在Mysql表中创建记录，如下所示

<?php
class Site{

// database connection and table name
private $conn;
private $table_name = "sites";

// object properties
public $id;
public $name;
public $location;
public $saddress;
public $duration;
public $created;

// create new site record
function create(){

// to get time stamp for 'created' field
$this->created=date('Y-m-d H:i:s');

// insert query
$query = "INSERT INTO " . $this->table_name . "
        SET
    site_name       = :name,
    site_location   = :location,
    site_address     = :address,
    site_duration   = :duration,
    created         = :created";
    

// prepare the query
$stmt = $this->conn->prepare($query);

// sanitize
$this->name=htmlspecialchars(strip_tags($this->name));
$this->location=htmlspecialchars(strip_tags($this->location));
$this->saddress=htmlspecialchars(strip_tags($this->saddress));
$this->duration=htmlspecialchars(strip_tags($this->duration));
$this->created=htmlspecialchars(strip_tags($this->created));




// bind the values
$stmt->bindParam(':name', $this->name);
$stmt->bindParam(':location', $this->location);
$stmt->bindParam(':address', $this->saddress);
$stmt->bindParam(':duration', $this->duration);
$stmt->bindParam(':created', $this->created);



// execute the query, also check if query was successful
if($stmt->execute()){
    
    return true;
}else{
    $this->showError($stmt);
    return false;
}

}
public function showError($stmt){
echo "<pre>";
    print_r($stmt->errorInfo());
echo "</pre>";
}

}
?>

我很困惑，因为我的HTLM表单字段和数据库表列字段的名称写得正确，而且每当我从查询中删除site_address字段时，其他数据都会插入表中，所以应该有人来帮忙。 下面是类的实现

你在发帖吗

$_POST[站点地址]

应该是什么时候

“站点地址”列不能为空

请改为尝试$\u POST['site\u address']

站点地址=：地址

---

这不应该是saddress吗？

您的数据库中有数据吗？$saddress应该是$this->saddress在数据库中存储时不应该使用htmlspecialchars和strip_标记。在网页上显示数据时应使用它们，以防止XSS。@user837288是的，我的数据库中有数据。只有未插入到表中的列site\u地址我从未看到$this->name或任何这些属性被分配。你从来没有告诉我们你是如何使用新网站的。我已经纠正了这一点，但没有工作到现在

Array
(
[0] => 23000
[1] => 1048
[2] => Column 'site_address' cannot be null
)

    <?php
// get database connection
$database = new Database();
$db       = $database->getConnection();
  
// pass connection to objects
$Construction = new Site($db);

// if the form was submitted - 
if(isset($_POST['submit'])){

 // set user property values

$Construction->name         = $_POST['sitename'];
$Construction->location     = $_POST['sitelocation'];
$Construction->saddress     = $_POST["siteaddress"];
$Construction->duration     = $_POST['siteduration'];
       

//Check if Construction Site already Exist
if($Construction->siteExists())
{

    echo '<div class="alert alert-danger text-center">
                          <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
                          <strong>Sorry!</strong> User Already Exist.
                    </div>';  




}else{


$Construction->create();


}
}
?>