在PHP oops中使用图像更新数据时出现问题
我是PHP oops新手。我已经创建了一个表，其中包含id、category_name、category_image和date列的类别名称 当我试图编辑特定id的类别名称而不更改当前图像时，会出现错误。但当我同时更改类别名称和图像时，效果很好 这是我的分类课在PHP oops中使用图像更新数据时出现问题,php,Php,我是PHP oops新手。我已经创建了一个表，其中包含id、category_name、category_image和date列的类别名称 当我试图编辑特定id的类别名称而不更改当前图像时，会出现错误。但当我同时更改类别名称和图像时，效果很好 这是我的分类课 <?php class Category extends DatabaseObject { static protected $table_name = 'category'; static pro
<?php
class Category extends DatabaseObject {
static protected $table_name = 'category';
static protected $db_columns = ['id','category_name','category_image','date'];
public $id;
public $category_name;
public $category_image;
public $date;
public $tmp_path;
public $upload_directory = "data/category";
public $custom_errors = array();
public $upload_errors_array = array(
UPLOAD_ERR_OK => "There is no error",
UPLOAD_ERR_INI_SIZE => "The uploaded file exceeds the upload_max_filesize directive in php.ini",
UPLOAD_ERR_FORM_SIZE => "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form",
UPLOAD_ERR_PARTIAL => "The uploaded file was only partially uploaded.",
UPLOAD_ERR_NO_FILE => "No file was uploaded.",
UPLOAD_ERR_NO_TMP_DIR => "Missing a temporary folder.",
UPLOAD_ERR_CANT_WRITE => "Failed to write file to disk.",
UPLOAD_ERR_EXTENSION => "A PHP extension stopped the file upload."
);
public function __construct($args=[]){
$this->category_name = $args['category_name'] ?? '';
$this->category_image = $args['category_image'] ?? '';
$this->date = $args['date'] ?? '';
}
public function set_file($file) {
if(empty($file) || !$file || !is_array($file)){
$this->errors[] = "There was no file uploaded here";
return false;
}
elseif($file['error'] !=0) {
$this->errors[] = $this->upload_errors_array[$file['error']];
return false;
}
else {
$ext = pathinfo($file['name'] , PATHINFO_EXTENSION);
$rand=rand(1111,9999);
$this->category_image = $this->category_name."-".rand().".".$ext;
$this->tmp_path = $file['tmp_name'];
}
}
public function picture_path() {
return $this->upload_directory.DS.$this->category_image;
}
public function save_photo() {
if($this->id){
$target_path = SITE_ROOT . DS . 'admin' .DS. $this->upload_directory .DS. $this->category_image;
if(move_uploaded_file($this->tmp_path, $target_path)){
if($this->update()){
unset($this->tmp_path);
return true;
}
else {
$this->errors[] = "The file directory probably does not have permission";
return false;
}
}
}
else{
if(!empty($this->errors)){
return false;
}
if(empty($this->category_image) || empty($this->tmp_path)){
$this->errors[] = "The File was not available";
return false;
}
if(is_dir($this->upload_directory)==false){
mkdir($this->upload_directory, 0700); // Create directory if it does not exist
}
$target_path = SITE_ROOT . DS . 'admin' .DS. $this->upload_directory .DS. $this->category_image;
if(file_exists($target_path)) {
$this->errors[] = "The file {$this->category_image} already exists";
return false;
}
if(move_uploaded_file($this->tmp_path, $target_path)){
if($this->create()){
unset($this->tmp_path);
return true;
}
else {
$this->errors[] = "The file directory probably does not have permission";
return false;
}
}
}
}
}
?>
<?php
if(!isset($_GET['id'])) {
redirect_to(url_for('category.php'));
}
$id = $_GET['id'];
$category = Category::find_by_id($id);
if($category == false){
redirect_to(url_for('category.php'));
}
if(is_post_request()) {
// Create record using post parameters
$args = $_POST['category'];
$category->merge_attributes($args);
if(is_uploaded_file($_FILES['cat_image'])){
$category->set_file($_FILES['cat_image']);
$result = $category->save_photo();
}
else{
$result = $category->save();
}
if($result === true) {
// $new_id = $project->id;
$session->message('The Category was Updated successfully.');
// echo '<script>window.location.href = "./project.php";</script>' ;
redirect_to(url_for('edit_category.php?id=' .$id));
} else {
// show errors
}
} else {
// display the form
}
?>
如果我没有选择任何文件或如果我选择了文件，我该怎么办 检查用户是否使用is_uploaded_file上传了文件。如果他们这样做了，就处理它。如果他们没有，什么也不做
<?php
...
if (is_post_request()) {
// Do your normal `category` processing
$args = $_POST['category'];
$category->merge_attributes($args);
// Only process the file if the user uploaded it.
if (is_uploaded_file($_FILES['cat_image']['tmp_name'])) {
$category->set_file($_FILES['cat_image']);
$result = $category->save_photo();
}
...
}
如何检查图像是否已在数据库中 您需要执行SQL查询，以确定该列是否包含值
<?php
...
if (is_post_request()) {
// Do your normal `category` processing
$args = $_POST['category'];
$category->merge_attributes($args);
// Only process the file if the user uploaded it.
if (is_uploaded_file($_FILES['cat_image']['tmp_name'])) {
// Check if image already exists.
// I do not know anything about your tables so I am just making one up here.
// Please don't ask me to write this for you.
// This is just pseudo code.
$query = 'SELECT 1 FROM table WHERE id = ? AND image_url IS NOT NULL';
if ($query->result == 1) {
// The row already contains a value - do something. Or not...
}
$category->set_file($_FILES['cat_image']);
$result = $category->save_photo();
}
...
}
嗯，您总是调用方法set_file，如果没有发布任何文件，它将返回一个错误。您需要找出它是否是一个更新，或者创建一个有效的id，这是一个更新。如果你没有身份证，这是一个创造。如果是“创建”，则需要该文件。如果是更新，则完全忽略该文件（如果该文件为空）如果我未选择任何文件或如果我选择文件，该怎么办？如何检查图像是否已在数据库中，或者我可以做什么do@ShadowShoot-请使用更新的问题编辑您的问题。不要把它们贴在评论栏。@Waterlomatt我的问题和上面的问题一样