如何使用 codeigniter 用新的图像数据更新表答案

【问题标题】：How to update table with new image data using codeigniter如何使用 codeigniter 用新的图像数据更新表
【发布时间】：2017-10-08 08:10:06
【问题描述】：

我有一个表格来上传图像路径和其他图像数据。当我选择上传新图像时，这很有效。

如果我提交表单而不选择新图像，如何防止我的图像路径设置为空白？

这是我的控制器：

    function updatewaterpurifier($id)
    {
        $name=$this->input->post('name');

        $this->load->model('user');  
        //$name =  $this->input->post('name');



        if($this->input->post('submit'))
        {

        //Check whether user upload picture
            if(!empty($_FILES['picture']['name'])){
                $new_file_name  = $this->input->post('name');
            $config['upload_path'] = 'uploads/images/';
            $config['allowed_types'] = 'jpg|jpeg|png|gif|pdf';

            $config['file_name'] = $new_file_name;
            $config['max_size']      = 2048;
            //Load upload library and initialize configuration
            $this->load->library('upload',$config);
            $this->upload->initialize($config);

            if($this->upload->do_upload('picture')){
                $uploadData = $this->upload->data();
                $picture = $uploadData['file_name'];
            }else{
                $picture = '';
            }
        }else{
            $picture = '';
        }
            //Prepare array of user data
            $userData = array(
                'product_brand'=> $this->input->post('brand'),
                'product_name' => $this->input->post('name'),
                'product_price' => $this->input->post('price'),
                'product_techno' => $this->input->post('technology'),
                'product_des' => $this->input->post('description'),
                'product_image' => $picture
            );
                $this->db->where('id', $id);
                $this->db->update('products', $userData);
            //Pass user data to model


            //Storing insertion status message.

        }

    //Form for adding user data
        $this->load->model('user'); 
        $this->data['h']= $this->user->editpurifier($id);
        $this->load->view('editwaterpurifier', $this->data, FALSE);



    }

【问题讨论】：

只是为了指出你正在加载$this->load->model('user'); 两次，为什么不将它放在控制器的 __construct 区域中，这样只需加载一次。 codeigniter.com/user_guide/general/…
@Adi Singh：在你的代码中，如果你没有上传图像，你将存储 $picture 变量为空并将其传递给你的更新数据。因此，删除该部分即可。
else part ko remove kar du @Sucharitha
@AdiSingh：是的，该部分不是必需的，然后在您的 $userData 数组中根据条件添加 $picture 数据。
我通过什么我想通过我的旧图像路径

标签： php codeigniter file-upload

【解决方案1】：

如果您在没有之前上传图片的情况下更新表格，则您的变量 $picture=''。使用它从数组$userData() 中取消设置product_image：

$userData = array(
  'product_brand'=> $this->input->post('brand'),
  'product_name' => $this->input->post('name'),
  'product_price' => $this->input->post('price'),
  'product_techno' => $this->input->post('technology'),
  'product_des' => $this->input->post('description'),
  'product_image' => $picture
);
if ($picture==''){
  unset($userData['product_image']);
}

这会从数组中删除product_image，并且不会将图像路径更新为空白。

【讨论】：

【解决方案2】：

在控制器中

 function updatewaterpurifier($id)
    {

        $this->load->model('user');  

        if($this->input->post('submit'))
        {
        //Prepare array of user data
            $userData = array(
                'product_brand'=> $this->input->post('brand'),
                'product_name' => $this->input->post('name'),
                'product_price' => $this->input->post('price'),
                'product_techno' => $this->input->post('technology'),
                'product_des' => $this->input->post('description')
            );
         $name=$this->input->post('name');

        //Check whether user upload picture
         if(!empty($_FILES['picture']['name']))
          {
            $new_file_name  = $this->input->post('name');
            $config['upload_path'] = 'uploads/images/';
            $config['allowed_types'] = 'jpg|jpeg|png|gif|pdf';

            $config['file_name'] = $new_file_name;
            $config['max_size']      = 2048;
            //Load upload library and initialize configuration
            $this->load->library('upload',$config);
            $this->upload->initialize($config);
            if($this->upload->do_upload('picture'))
            {
                $uploadData = $this->upload->data();
                $picture = $uploadData['file_name'];
                $userData['product_image']=$picture;
            }
           }

        //Pass user data to model
         $this->user->update_purifier($id,$userData);

        }

    //Form for adding user data
        $this->data['h']= $this->user->editpurifier($id);
        $this->load->view('editwaterpurifier', $this->data, FALSE);



    }

型号

public function update_purifier($id,$userData)
    {

                $this->db->where('id', $id);
                $this->db->update('products', $userData);
    }

检查产品图片名称是否包含扩展名。如果不添加

$ext1 = explode('.',$_FILES['picture']['name']);
$ext2 = array_reverse($ext1);
$extention = strtolower($ext2[0]);
$config['file_name'] = $new_file_name.'.'.$extention;

【讨论】：