Scala 从数据库中获取多个列？

我使用以下代码从数据库表中获取列列表

val result =
    sqlContext.read.format("jdbc").options(Map(
      "driver" -> "com.microsoft.sqlserver.jdbc.SQLServerDriver",
      "url" -> jdbcSqlConn,
      "dbtable" -> s"...."
    )).load()
    .select("column1") // Now I need to select("col1", "col2", "col3")
    .as[Int]

---

现在我需要从数据库表中获取多个列，并希望结果是强类型DataSet？。代码应该如何编写

这应该可以做到：-

val colNames = Seq("column1","col1","col2",....."coln")

val result = sqlContext.read.format("jdbc").options(Map(
  "driver" -> "com.microsoft.sqlserver.jdbc.SQLServerDriver",
  "url" -> jdbcSqlConn,
  "dbtable" -> s"...."
)).load().select(colNames.head, colNames.tail: _*)

val newResult = result.withColumn("column1New", result.column1.cast(IntegerType))
.drop("column1").withColumnRenamed("column1New", "column1")