Spark学习第二步 SparkSql
文章目录
前言
一、是什么?
示例:pandas 是基于NumPy 的一种工具,该工具是为了解决数据分析任务而创建的。
二、使用步骤
1.配置依赖(Maven)以及文件
使用Maven包管理工具。在pom.xml中添加需要的依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>sxnd_scala</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-actor_2.11</artifactId>
<version>2.5.23</version>
</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.11.11</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.7.2</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.7.16</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.16</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.16</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
</dependency>
</dependencies>
</project>
写一个需要读取的文件,分为三个部分,第一是订单号,第二是购买人,第三是购买日期,写入一个txt文件中。
BYSL00000893,ZHAO,2007-8-23
BYSL00000897,ZHAO,2007-8-24
BYSL00000898, ZHAO,2007-8-25
BYSL00000899,ZHAO,2007-8-26
BYSL00000900, ZHAO,2007-8-26
BYSL00000901,ZHAO,2007-8-27
BYSL00000902,ZHAO,2007-8-27
BYSL00000904,ZHAO,2007-8-28
BYSL00000905,ZHAO,2007-8-28
BYSL00000906,ZHAO,2007-8-28
BYSL00000907,ZHAO,2007-8-29
BYSL00000908,ZHAO,2007-8-30
BYSL00000909,ZHAO,2007-9-1
BYSL00000910,ZHAO,2007-9-1
BYSL00000911,ZHAO,2007-8-31
BYSL00000912,ZHAO,2007-9-2
BYSL00000913,ZHAO,2007-9-3
BYSL00000914,ZHAO,2007-9-3
2.读入数据
在创建的maven文件中,找到scala文件夹,在下边创建文件,用来进行数据的读取
package day_03
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.SparkSession
class SparkSqlTest {
}
case class tbStock(ordernumber:String,localtionid:String,dateid:String) extends Serializable
object Test{
def main(args: Array[String]): Unit = {
val spark = SparkSession.builder().master("local[3]").appName("SparkSqlTest").getOrCreate()
import spark.implicits._
val sc = spark.sparkContext
var rdd:RDD[String] = sc.textFile("D:\\SparkSQL\\tbStock.txt")
val ds = rdd.map(_.split(",")).map(strArr=>{
tbStock(strArr(0),strArr(1),strArr(2))
}
).toDS
}
}
问题
在idea中添加依赖之后的下载