How to insert multiple checkbox value in mysql usi

问题:

i am novice in codeigniter. I am trying to insert multiple news that contains some check-box where its values are looped from a database. But i don't know what should code i write for this in controller & Model to insert values. can any one suggest or help me to write code?

view - content.php:

//category name
<?php foreach($result as $aresult) { ?>
    <input type="checkbox" name="category_name[]" value="<?php echo $aresult->category_name;?>" /> <?php echo $aresult->category_name;?>
<?php  } ?>

controller - news:

public function savecontent()
{         
    $data=array();
    foreach($this->input->post('category_name') as $category_name) 
    {
       $data[] = array('category_name' => $category_name);
    }
    $data['content_headline']=$this->input->post('content_headline',true);
    $this->co_model->save_content($data);
}

Model:

public function save_content($data)
{
    $this->db->insert('content',$data);
}

Database structure:

id(auto incr.), category_name(varchar 50),  content_headline(varchar 100) 

now what should i change to insert multiple row using checkbox ? here there have also another text box/column which also insert in database. but only category name(checkbox value) should be change for all value.

回答1:

First of all you need to adjust your database structure. Apparently, there's a M:N relation between content and category. A more appropriate schema would be:

create table content (
  id int not null auto_increment primary key,
  content_headline varchar(100) not null
  );

create table category (
  id int not null auto_increment primary key,
  caregory_name varchar(100) not null
  );

create table content_category (
  content int not null references content,
  category int not null references category,
  primary key (content,category)
  );

Then, you need to adjust your code to reflect the new schema.

Supposing you get $result from a select * from category, your view would boil down to:

<label>
  Headline:
  <input type='text' name='headline'>
</label>
<?php foreach($result as $aresult): ?>
  <label>
    <input type="checkbox" name="category[<?php echo $aresult->id; ?>]">
    <?php echo $aresult->category_name; ?>
  </label>
<?php endforeach; ?>

When posted, this will provide you with an array like the following:

array(
  'headline'=>'War and Peace',
  'category'=>array(
    45=>'on',
    6=>'on'
    )
  );

...where 45 and 6 are the checked category ids. Please note that, if no category is checked, the category array will not be defined.

So the controller becomes:

public function savecontent()
  {         
  $post=$this->input->post();
  $selected_cats=(isset($post->category)?array_keys($post->category):array());
  $data=array(
    'headline'=>$post->headline,
    'category'=>$selected_cats
    );
  $this->co_model->save_content($data);
  }

And finally, the model:

public function save_content($data)
  {
  $this->db->insert('content',array('content_headline',$data['headline']);
  $content=$this->db->insert_id(); // what we inserted
  foreach($data['category'] as $cat)
    $this->db->insert(
      'content_category',
      array(
        'content'=>$content,
        'category'=>$cat
        )
      );
  }