title: TypeORM - Order By in raw sql dont work with parameter
body: <p>I am using <code>entityManager</code> and raw query to get data from Postgres database. I have simple query for select and order by <code>item_id</code>.
  If I write full query as:</p>
  
  <p><code>let query = "Select * From item
  ...
  Order By item_id";</code>
  and pass it to entityManager 
  <code>await this.entityManager.query(query)</code> order by is working correctly.</p>
  
  <p>But if I write query with parameter:</p>
  
  <p><code>let query = "Select * From item
  ...
  Order By $1";</code>
  and pass columnName for ordering to entityManager <code>await this.entityManager.query(query,["item_id"])</code> order by is completely ignored.</p>
  
  <p>I also tried put columName to property and pass that property to entityManager:
  <code>let columnName = "item_id";
  await this.entityManager.query(query,[columnName])</code>
  but with same result.</p>
  
  <p>We have PostgreSql as database and typeorm version ^0.2.9</p>
  
  <p>Does anyone know, where could be the problem? Or is there any workarround to use Order By with parametr in raw sql?</p>
  
  <p>Thanks in advance.</p>