title: Scrapy: how to use items in spider and how to send items to pipelines?
body: <p>I am new to <code>scrapy</code> and my task is simple:</p>
  
  <p>For a given e-commerce website:</p>
  
  <ul>
  <li><p>crawl all website pages</p></li>
  <li><p>look for products page </p></li>
  <li><p>If the URL point to a product page </p></li>
  <li><p>Create an Item</p></li>
  <li><p>Process the item to store it in a database</p></li>
  </ul>
  
  <p>I created the spider but products are just printed in a simple file.</p>
  
  <p>My question is about the project structure: how to use items in spider and how to send items to pipelines ?</p>
  
  <p>I can't find a simple example of a project using items and pipelines.</p>