title: strapi + knex to execute complex Queries
body: <p>How do  I get the knex object to execute custom or complex queries within my strapi service?</p>
  <p>My Strapi version has the <code>strapi-hook-knex</code> and <code>strapi-hook-bookshelf</code> installed but when I run <code>qb.raw</code> it is an undefined object.</p>
  <p>This is to run queries like this:</p>
  <pre><code>qb.select(knex.raw('.... ?? )', '...'))
  </code></pre>