import org.apache.spark.sql.SparkSessionimport org.apache.spark.sql.functions._object CheckDuplicateAttributes { def main(args: Array[String]): Unit = { val spark = SparkSession.builder() .appName("CheckDuplicateAttributes") .master("local[*]") .getOrCreate() val inputPath = "hdfs://localhost:9000/platform_data" val outputPath = "hdfs://localhost:9000/platform_data/output" val df = spark.read.format("csv") .option("header", "true") .option("inferSchema", "true") .load(inputPath) val datePattern = "yyyy-MM-dd" val dfFormatted = df.select( date_format(col("申请时间"), datePattern).as("申请日期"), date_format(col("创建时间"), datePattern).as("创建日期"), date_format(col("created_at"), datePattern).as("创建日期2"), date_format(col("updated_at"), datePattern).as("更新日期") ) val count1 = dfFormatted.filter(col("申请日期") === col("创建日期")).count() val count2 = dfFormatted.filter(col("创建日期2") === col("更新日期")).count() println(s"两组属性同时相等的数据条数为${count1}条") println(s"两组属性同时相等的数据条数为${count2}条") spark.stop() }}
时间: 2023-07-21 14:51:31 浏览: 45
这段代码是一个检查重复属性的 Spark 应用程序。它从指定的路径读取 CSV 文件,然后选择其中的四个属性,并将它们格式化为日期格式。接着,它分别计算了两组属性同时相等的数据条数,并将结果打印输出。
如果需要改进这段代码,有以下几点可以考虑:
1. 文件路径硬编码:应该将文件路径作为参数传入程序,而不是硬编码在代码中。
2. 日志输出:应该使用日志框架来输出日志信息,而不是直接使用 println 函数。
3. 变量命名:应该使用更加具有描述性的变量名,使得代码更易读。
4. 可读性:应该更加注重代码的可读性,比如使用空格、缩进等。
5. 异常处理:应该添加异常处理机制,以避免出现意外情况导致程序崩溃。
6. 可扩展性:应该将代码设计为可扩展的,以方便后续的修改和维护。
以上是一些常见的代码改进点,具体可以根据实际情况进行调整。
相关问题
import org.apache.spark.SparkContext import org.apache.spark.SparkConf import org.apache.spark.rdd.RDD import org.apache.spark.sql.SQLContext class Sale { } object Sale { case class Sale(cardId:String,productId:Int,quantity:Int,money:Double) def main(args: Array[String]): Unit = { val conf = new SparkConf().setAppName("Pharmacy Sales Analysis").setMaster("local") val sc = new SparkContext(conf) sc.setLogLevel("ERROR") val sqlContext = new SQLContext(sc) // load data val data = sc.textFile(args(0)) // parse data val salesRDD: RDD[Sale] = data.map(line => line.split(" ")).map(arr => Sale(arr(0), arr(1).toInt, arr(2).toInt, arr(3).toDouble)) import sqlContext.implicits._ val df = salesRDD.toDF() val nameMoneyDF = df.select("productId","money","quantity") nameMoneyDF.show(5) val totalSales = nameMoneyDF.groupBy("productId").sum("quantity") totalSales.show(5) // calculate total sales quantity and revenue } }帮我统计所有产品销售额,money为产品单价
如果你想要统计所有产品的销售额,可以使用以下代码:
```
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.SQLContext
class Sale {}
object Sale {
case class Sale(cardId:String,productId:Int,quantity:Int,money:Double)
def main(args: Array[String]): Unit = {
val conf = new SparkConf().setAppName("Pharmacy Sales Analysis").setMaster("local")
val sc = new SparkContext(conf)
sc.setLogLevel("ERROR")
val sqlContext = new SQLContext(sc)
// load data
val data = sc.textFile(args(0))
// parse data
val salesRDD: RDD[Sale] = data.map(line => line.split(" ")).map(arr => Sale(arr(0), arr(1).toInt, arr(2).toInt, arr(3).toDouble))
import sqlContext.implicits._
val df = salesRDD.toDF()
val nameMoneyDF = df.select("productId","money","quantity")
nameMoneyDF.show(5)
// calculate total sales quantity and revenue
val totalSales = nameMoneyDF.groupBy("productId").agg(sum("money").as("totalRevenue"))
totalSales.show(5)
}
}
```
这段代码会根据产品ID对数据进行分组,并计算每个产品的销售额。其中`sum("money")`函数用于计算每个产品的销售额总和,`as`函数用于指定结果集中的列名为"totalRevenue"。
你可以在`totalSales.show(5)`操作之前添加以下代码,用于按照销售额降序排序并显示前5个产品的销售额:
```
val topProducts = totalSales.orderBy(desc("totalRevenue")).limit(5)
topProducts.show()
```
注意,这里的`desc`函数需要使用`org.apache.spark.sql.functions.desc`导入。
import org.apache.spark.SparkContext import org.apache.spark.SparkConf import org.apache.spark.rdd.RDD import org.apache.spark.sql._ import org.apache.spark.sql.functions._ class Sale { } object Sale { case class Sale(cardId:String,productId:Int,quantity:Int,money:Double) def main(args: Array[String]): Unit = { val conf = new SparkConf().setAppName("Pharmacy Sales Analysis").setMaster("local") val sc = new SparkContext(conf) sc.setLogLevel("ERROR") val sqlContext = new SQLContext(sc) // load data val data = sc.textFile(args(0)) // parse data val salesRDD: RDD[Sale] = data.map(line => line.split(" ")).map(arr => Sale(arr(0), arr(1).toInt, arr(2).toInt, arr(3).toDouble)) import sqlContext.implicits._ val df = salesRDD.toDF() val nameMoneyDF = df.select("productId","money","quantity") nameMoneyDF.show(5) val totalSales = nameMoneyDF.groupBy("productId").sum("quantity") //totalSales.show(5) val topSales = totalSales.select(totalSales("productId"),totalSales("sum(quantity)").as("Totalquantity")) .orderBy(desc("Totalquantity")) topSales.show(5) val totalbuy = df.groupBy("cardId").sum("quantity") //totalbuy.show(5) val topbuy = totalbuy.select(totalbuy("cardId"),totalbuy("sum(quantity)").as("Totalquantity")) .orderBy(desc("Totalquantity")) topbuy.show(5) val Oneproduct:Dataset[Row]= topSales.select("productId","Totalquantity").filter(row=>row.getAs[String]("productId") == 230010) Oneproduct.show() sc.stop() }}帮我写个注释
```scala
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf
import org.apache.spark.rdd.RDD
import org.apache.spark.sql._
import org.apache.spark.sql.functions._
class Sale { }
object Sale {
case class Sale(cardId:String,productId:Int,quantity:Int,money:Double)
def main(args: Array[String]): Unit = {
val conf = new SparkConf().setAppName("Pharmacy Sales Analysis").setMaster("local")
val sc = new SparkContext(conf)
sc.setLogLevel("ERROR")
val sqlContext = new SQLContext(sc)
// load data
val data = sc.textFile(args(0))
// parse data
val salesRDD: RDD[Sale] = data.map(line => line.split(" ")).map(arr => Sale(arr(0), arr(1).toInt, arr(2).toInt, arr(3).toDouble))
import sqlContext.implicits._
val df = salesRDD.toDF()
// select columns and show top 5 rows
val nameMoneyDF = df.select("productId","money","quantity")
nameMoneyDF.show(5)
// group by productId and sum the quantity, then show top 5 products with highest sales
val totalSales = nameMoneyDF.groupBy("productId").sum("quantity")
val topSales = totalSales.select(totalSales("productId"),totalSales("sum(quantity)").as("Totalquantity")).orderBy(desc("Totalquantity"))
topSales.show(5)
// group by cardId and sum the quantity, then show top 5 customers with highest purchase quantity
val totalbuy = df.groupBy("cardId").sum("quantity")
val topbuy = totalbuy.select(totalbuy("cardId"),totalbuy("sum(quantity)").as("Totalquantity")).orderBy(desc("Totalquantity"))
topbuy.show(5)
// select rows for one specific product (productId = 230010) and show the result
val Oneproduct:Dataset[Row]= topSales.select("productId","Totalquantity").filter(row=>row.getAs[String]("productId") == 230010)
Oneproduct.show()
sc.stop()
}
}
```
注释如下:
```scala
// 导入Spark相关的库
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf
import org.apache.spark.rdd.RDD
import org.apache.spark.sql._
import org.apache.spark.sql.functions._
// 定义Sale类
class Sale { }
// Sale伴生对象
object Sale {
// 定义Sale类的属性
case class Sale(cardId:String,productId:Int,quantity:Int,money:Double)
def main(args: Array[String]): Unit = {
// 设置Spark的配置信息,并创建SparkContext
val conf = new SparkConf().setAppName("Pharmacy Sales Analysis").setMaster("local")
val sc = new SparkContext(conf)
sc.setLogLevel("ERROR")
val sqlContext = new SQLContext(sc)
// 加载数据
val data = sc.textFile(args(0))
// 解析数据并创建RDD
val salesRDD: RDD[Sale] = data.map(line => line.split(" ")).map(arr => Sale(arr(0), arr(1).toInt, arr(2).toInt, arr(3).toDouble))
// 将RDD转换为DataFrame
import sqlContext.implicits._
val df = salesRDD.toDF()
// 选择需要的列并展示前5行
val nameMoneyDF = df.select("productId","money","quantity")
nameMoneyDF.show(5)
// 按productId分组并计算销售量,然后展示销售量最高的5个商品
val totalSales = nameMoneyDF.groupBy("productId").sum("quantity")
val topSales = totalSales.select(totalSales("productId"),totalSales("sum(quantity)").as("Totalquantity")).orderBy(desc("Totalquantity"))
topSales.show(5)
// 按cardId分组并计算购买量,然后展示购买量最高的5个客户
val totalbuy = df.groupBy("cardId").sum("quantity")
val topbuy = totalbuy.select(totalbuy("cardId"),totalbuy("sum(quantity)").as("Totalquantity")).orderBy(desc("Totalquantity"))
topbuy.show(5)
// 选择productId为230010的行并展示结果
val Oneproduct:Dataset[Row]= topSales.select("productId","Totalquantity").filter(row=>row.getAs[String]("productId") == 230010)
Oneproduct.show()
// 停止SparkContext
sc.stop()
}
}
```