MongoDB的。 从数据库中提取整数。 java.lang.Integer无法强制转换为java.lang.String

Question

I am new to MongoDb. I was trying to retreive data from the db. Here is part of my code:

    dbc(TABLENAME).find ( MongoDBObject (UID -> uid)).toList.foreach {s =>
      val Rollno = s.getAs[String](ROLL).getOrElse ("?")

Apparently ROLL is set as integer, and I keep on getting the error java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String Is there an easy solution to get it?

Answer 1

How about getting it as an integer and then using toString?

dbc(TABLENAME).find ( MongoDBObject (UID -> uid)).toList.foreach {s =>
  val Rollno = s.getAs[Int](ROLL).map(_.toString).getOrElse("?")