MYSQL文件大小不顯示

Question

我正在學習如何使用PHP視頻書/教程構建一個photo_gallery。我能夠上傳照片，但在MySQL數據庫中，它沒有註冊照片的大小。它只是說0（見圖）

教師的Mysql給出了文件的大小。

任何想法爲什麼文件大小不會顯示在SQL中？

UPDATE ......這就是照片類。

<?php 

require_once(LIB_PATH.DS.'database.php'); 

class Photograph extends DatabaseObject { 

protected static $table_name="photographs"; 
protected static $db_fields=array('id', 'filename', 'type', 'caption'); 
public $id; 
public $filename; 
public $type; 
public $size; 
public $caption; 

private $temp_path; 
protected $upload_dir="images"; 
public $errors=array(); 

protected $upload_errors = array(
UPLOAD_ERR_OK   => "No errors.", 
UPLOAD_ERR_INI_SIZE => "Larger than upload_max_filesize.", 
UPLOAD_ERR_FORM_SIZE => "Larger than form MAX_FILE_SIZE.", 
UPLOAD_ERR_PARTIAL => "Partial upload.", 
UPLOAD_ERR_NO_FILE => "No file.", 
UPLOAD_ERR_NO_TMP_DIR => "No temporary directory.", 
UPLOAD_ERR_CANT_WRITE => "Can't write to disk.", 
UPLOAD_ERR_EXTENSION => "File upload stopped by extension." 

); 

// Pass in $_FILE(['uploaded_file']) as an argument 
public function attach_file($file) { 
//perform error checking on the form parameters 
if(!file || empty($file) || !is_array($file)){ 
//error: nothing uploaded or wrong usage 
$this->errors[] = "No file was uploaded."; 
return false; 
} elseif($file['error'] !=0) { 
//error: report what PHP says went wrong 
$this->errors[] = $this->upload_errors[$file['error']]; 
return false; 
} else { 

//set object attributes to the form parameters. 
$this->temp_path = $file['tmp_name']; 
$this->filename = basename($file['name']); 
$this->type  = $file['type']; 
$this->size  = $file['size']; 
//don't worry about saving anything to the database yet 
return true; 
    } 
} 

public function save() { 
// a new record won't have an id yet. 
if(isset($this->id)) { 
//really just to update the caption 
$this->update(); 
} else { 
//make sure there are no errors 

//Can't save if there are pre-existing errors 
if(!empty($this->errors)) {return false; } 

//make sure the caption is not too long for the DB 
if(strlen($this->caption) > 255) { 
$this->error[] = "The caption can only be 255 characters long."; 
return false; 
} 

//Can't save without filename and temp location 
if(empty($this->filename) || empty($this->temp_path)){ 
$this->errors[] = "The file location was not available."; 
return false; 
} 

//Determine the target_path 
$target_path = SITE_ROOT .DS. 'public' .DS. $this->upload_dir .DS. $this->filename; 

//Make sure a file doesn't already exist 

if(file_exists($target_path)) { 
$this->errors[] = "The file {$this->filename} already exists."; 
return false; 
} 

//attempt to move the file 
if(move_uploaded_file($this->temp_path, $target_path)) { 
//success 
//save a corresponding entry to the database 
if($this->create()) { 
//we are done with temp_path, the file isn't there anymore 
unset($this->temp_path); 
return true; 
} 
} else { 
//failure 
$this->errors[] = "The file upload failed, possibly due to incorrect permissions 
on the upload folder."; 
return false; 
     } 
    } 
} 

//common database methods 

public static function find_all(){ 
return self::find_by_sql("SELECT * FROM ".self::$table_name); 

} 

public static function find_by_id($id=0) { 
global $database; 
$result_array = self::find_by_sql("SELECT * FROM ".self::$table_name." WHERE id={$id} LIMIT 1"); 
return !empty($result_array) ? array_shift($result_array) : false; 
} 

public static function find_by_sql($sql=""){ 
global $database; 
$result_set = $database->query($sql); 
$object_array = array(); 
while ($row = $database->fetch_array($result_set)) { 
$object_array[] = self::instantiate($row); 
} 
return $object_array; 
} 




private static function instantiate($record){ 

$object = new self; 
//$object->id = $record['id']; 
//$object->username = $record['username']; 
//$object->password = $record['password']; 
//$object->first_name = $record['first_name']; 
//$object->last_name = $record['last_name']; 

foreach($record as $attribute=>$value) { 
if($object->has_attribute($attribute)) { 
$object->$attribute = $value; 
} 
} 
return $object; 
} 

private function has_attribute($attribute) { 
$object_vars = $this->attributes(); 
return array_key_exists($attribute, $object_vars); 
} 

protected function attributes() { 
//return an array of attribute keys and their values 
$attributes = array(); 
foreach(self::$db_fields as $field) { 
if(property_exists($this, $field)) { 
$attributes[$field] = $this->$field; 
} 
} 
return $attributes; 
} 

protected function sanitized_attributes() { 
global $database; 
$clean_attributes = array(); 
//sanitize the values before submitting 
//Note: does not alter the actual value of each attribute 
foreach($this->attributes() as $key=> $value) { 
$clean_attributes[$key] = $database->escape_value($value); 
} 
    return $clean_attributes; 
} 

//replaced with a custom save() 
//public function save() { 
//return isset($this->id) ? $this->update() : $this->create(); 
//} 

public function create() { 
global $database; 
$attributes = $this->sanitized_attributes(); 
$sql = "INSERT INTO ".self::$table_name." ("; 
$sql .= join(", ", array_keys($attributes)); 
$sql .= ") VALUES ('"; 
$sql .= join("', '", array_values($attributes)); 
$sql .= "')"; 
if ($database->query($sql)) { 
$this->id = $database->insert_id(); 
return true; 
} else { 
    return false; 
} 
} 

public function update() { 
global $database; 
$attributes = $this->sanitized_attributes(); 
$attribute_pairs = array(); 
foreach($attributes as $key => $value) { 
    $attribute_pairs[] = "{$key}='{$value}'"; 
} 
$sql = "UPDATE ".self::$table_name." SET "; 
$sql .= join(", ", $attribute_pairs); 
$sql .= " WHERE id=". $database->escape_value($this->id); 
$database->query($sql); 
return($database->affected_rows() == 1) ? true : false; 
} 

public function delete() { 
global $database; 
$sql = "DELETE FROM ".self::$table_name." "; 
$sql .= "WHERE id=". $database->escape_value($this->id); 
$sql .= " LIMIT 1"; 
$database->query($sql); 
return($database->affected_rows() == 1) ? true : false; 

} 

} 

？>

Answer 1

我想你忘了把大小在$db_fields

protected static $db_fields=array('id', 'filename', 'type', 'size', 'caption'); 

如果你看看你的attributes()功能，它會檢查，看是否$db_fields然後內property_exists分配價值$attributes陣列，因爲'大小'不在你正在檢查的陣列，它基本上被濾除是我猜測：

protected function attributes() { 
    //return an array of attribute keys and their values 
    $attributes = array(); 
    foreach(self::$db_fields as $field) { 
     if(property_exists($this, $field)) { 
      $attributes[$field] = $this->$field; 
     } 
    } 
    return $attributes; 
}