之前的Java查询Mysql的工具类地址：

Java 获取mysql连接工具类_小菜菜1223的博客-CSDN博客

scala配合工具类进行mysql查询代码：

package utils

object SelectUtils {

  def selectConf(sql: String): String = {
    var conf: String = ""
    val conn = JdbcUtils.getConnection
    val pst = conn.prepareStatement(sql)

    val result = pst.executeQuery()
    while (result.next()) {
      conf = result.getString("conf")
    }
    JdbcUtils.closeResource(conn, pst)
    conf
  }
}