将blob转换为文件，然后下载它

Question

如何从类型为blob的数据库下载文件。我已经将文件从图像保存到blob了。但我不知道再次进入形象。

我已经创建了功能下载但没有工作..

插入功能

public funtion upload(){
    $name  = $_FILES['file']['name'];
    $size  = $_FILES['file']['size'];
    $type  = $_FILES['file']['type'];
    $from  = $_FILES['file']['tmp_name'];

    //need to get the content of the file
    $fp = fopen($from, 'r');
    $file_content = fread($fp, filesize($from));
    $file_content = bin2hex($file_content);
    fclose($fp);

    $insertFile = "insert into tb_file (name,content,type,size) VALUES ('$name','$file_content','$type','$size')";
}

下载功能

public function download(){
    $this->load->helper('download');
    $id_file = $this->uri->segment(3);
    $path = base_url()."images/tmp";


    $this->load->database();
    $show = "select * from tb_file where id_file = ".$id_file.";
    $row = $this->db->query($show)->row();

    $image = $row->content;
    $name = $row->name;
    $type = $row->type;
    $size = $row->size;

    $data = file_put_contents($path."/".$name, base64_decode($image));

    header($type);
    force_download($name, $data);
}

我的代码中缺少什么？它是下载但没有大小

注意：使用codeigniter框架

Answer 1

我认为在下载之前你不需要再将blob保存到文件中。不使用codeigniter下载帮助程序尝试此操作：

public function download(){
    $id_file = $this->uri->segment(3);    

    $this->load->database();
    $show = "select * from chat,tb_user,tb_file where chat.id_user = tb_user.id_user and chat.id_file = tb_file.id_file and tb_file.id_file = ".$id_file." order by waktu desc ";
    $row = $this->db->query($show)->row();

    $image = $row->content;
    $name = $row->name;
    $type = $row->type;
    $size = $row->size;

    header('Content-length: ' . $size);
    header('Content-type: ' . $type);
    header('Content-Disposition: attachment; filename=' . $name);
    ob_clean();
    flush();
    echo hex2bin($image); // or base64 decode 
    exit;
}