title: Kotlin Exposed SELECT single record
body: <p>is there any way to select only one record with kotlin exposed?
  Currently I'm using below code to select a user from DB, but is there any function like selectSingle() to get an object (not list) ?</p>
  <pre><code>fun getUser(userId: Int): User? {
  
      var user: User? = null
  
      transaction {
          user = UserTable.select { UserTable.id eq userId }.limit(1).map { User.fromRow(it) }[0]
      }
  
      return user
  }
  </code></pre>