spark sql

最新推荐文章于 2024-07-09 22:21:42 发布

striverpan

最新推荐文章于 2024-07-09 22:21:42 发布

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本文链接：https://blog.youkuaiyun.com/w616358337/article/details/53157530

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package com.pan.sparksql

import org.apache.spark.SparkConf
import org.apache.spark.SparkContext


/**
  * Created by pan on 2016/11/11.
  */
object Demo {

  case  class SgmRating(uid:Int,gid:Int,rating: Float)
  def main(args: Array[String]) {


       val conf = new SparkConf()
       val sc = new SparkContext(conf)
       val sqlContext = new  org.apache.spark.sql.SQLContext(sc);

       import sqlContext.implicits._
       val ratingRdd = sc.textFile("/user/sys_imoment/ratings.dat").map(_.split("::")).map(p=>SgmRating(p(0).toInt,p(1).toInt,p(3).toFloat)).toDF;
       ratingRdd.registerTempTable("rating")
       ratingRdd.show()
       val res = sqlContext.sql("SELECT * FROM rating")
       val rr=res.map(t => "uid: " + t(0)).collect();



  }

}