title: Anorm filter a query with LIKE clause
body: <p>Using scala play anorm and mysql, I try to make a sql query, filtering using a LIKE operator:</p>
  
  <pre><code>import java.sql.Connection
  import anorm._
  
  Class.forName("com.mysql.jdbc.Driver").newInstance()
  implicit val conn = java.sql.DriverManager.getConnection(dbUrl)
  val list = SQL"select firstName from person where lastName like '%tra%'".as(parser.*)
  
  Exception in thread "main" java.lang.RuntimeException: No parameter value for placeholder: 1
  </code></pre>
  
  <p>here it should filter all persons whose lastName contains the 'tra' string.
  why is it not working?
  is anorm (or java dbc) treating '%' as a special character? if so, how to escape this?</p>