Saving articles and related categories according to normalization

问题

Saving articles_categories according to normalization

I have three tables

  -----------
    articles  
    -----------
    id  int(11) 
    title varchar(100)


-----------
categories
----------
id  int(11)
title varchar(100)


-------------------
articles_categories
--------------------
articles_id  int(11)
categories_id int(11)

I want to save it according to normalization rule to achieve like this

articles_id  | categories_id
     1                1 
     1                2 
     1                3

How can I achieve with code igniter thanks. So far I had already tried like this

View | Create.php

<?php echo form_input('title','','id="title_input"'); ?><br>
Category
<?php 
    foreach ($categories as $c)
    {
        echo '<input type="checkbox" id="categories[]" name="categories[]" value="'.$c['id'].'">';
        echo $c['title'].'&nbsp';
        }
?>

    <?php
        echo form_submit('Submit',"Submit");
        echo form_close();
    ?>

Controller | articles.php

function insert()
{
    $this->articles_model->save();

}

Model | articles_model.php

 function save(){
    $title=$this->input->post('title');
    $categories= implode(',',$_POST['categories']); //inputs will be 1,2,3

    $data=array(
         /* missing ideas.............*/
     );

    $this->db->insert('articles_categories',$data);
 }

Any help is appreciated. Thanks

回答1:

Ok so you need to first save your article and use $this->db->insert_id() to get the id of it.

$title = $this->input->post('title');
$data = array('title' => $title);
$this->db->insert('articles', $data);
$article_id = $this->db->insert_id();

Now create a batch operation to insert that id against each of the categories (don't use implode!)

$categories = $this->input->post('categories');
$data = array();
foreach($categories as $category_id){
    $data[] = array(
        'articles_id' => $article_id,
        'categories_id' => $caregory_id
    );
}
$this->db->insert_batch('articles_categories', $data);

Hope that helps!

来源：https://stackoverflow.com/questions/16733325/saving-articles-and-related-categories-according-to-normalization

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codeigniter