大數(shù)據(jù)培訓(xùn)_如何使用Spark連接與操作Mysql數(shù)據(jù)庫

發(fā)布時(shí)間： 2019-07-26 16:45:44

　　大數(shù)據(jù)培訓(xùn)_如何使用Spark連接與操作Mysql數(shù)據(jù)庫

　　JDBC介紹
　　Spark SQL可以通過JDBC從關(guān)系型數(shù)據(jù)庫中讀取數(shù)據(jù)的方式創(chuàng)建DataFrame，通過對DataFrame一系列的計(jì)算后，還可以將數(shù)據(jù)再寫回關(guān)系型數(shù)據(jù)庫中。
　　從MySQL中加載數(shù)據(jù)（Spark Shell方式）
　　1.啟動(dòng)Spark Shell，必須指定mysql連接驅(qū)動(dòng)jar包
/home/hadoop/apps/spark/bin/spark-shell \
--master spark://hdp08:7077 \
--jars /home/hadoop/mysql-connector-java-5.1.45.jar \
--driver-class-path /home/hadoop/mysql-connector-java-5.1.45.jar
--executor-memory 1g
--total-executor-cores 2

　　2.從mysql中加載數(shù)據(jù)
scala> case class Emp(empno: Int, ename: String, job:String,mgr:Int,hiredate:java.util.Date,sal:Float,comm:Float,deptno:Int)
scala>var sqlContext = new org.apache.spark.sql.SQLContext(sc);
scala> val jdbcDF = sqlContext.read.format("jdbc").options(Map("url" -> "jdbc:mysql://hdp08:3306/sqoopdb", "driver" -> "com.mysql.jdbc.Driver", "dbtable" -> "emp", "user" -> "root", "password" -> "root")).load()

　　3.執(zhí)行查詢
jdbcDF.show()

　　將數(shù)據(jù)寫入到MySQL中（打jar包方式）
　　本文介紹使用Idea 開發(fā)spark連接mysql操作,并建立maven 工程進(jìn)行相關(guān)開發(fā)
　　Maven中的pom.xml文件依賴

<groupId>org.apache.spark</groupId>

<artifactId>spark-core_2.10</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-hive_2.10</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.apache.spark</groupId>

<artifactId>spark-sql_2.10</artifactId>

<scope>provided</scope>

</dependency>

　　編寫Spark SQL程序

package net.togogo.sql

import java.util.Properties

import org.apache.spark.sql.{SQLContext, Row}

import org.apache.spark.sql.types.{StringType, IntegerType, StructField, StructType}

import org.apache.spark.{SparkConf, SparkContext}

object JdbcRDD {

def main(args: Array[String]) {

val conf = new SparkConf().setAppName("MySQL-Demo")

val sc = new SparkContext(conf)

val sqlContext = new SQLContext(sc)

//通過并行化創(chuàng)建RDD

val personRDD = sc.parallelize(Array("1 tom 5", "2 jerry 3", "3 kitty 6")).map(_.split(" "))

//通過StructType直接指定每個(gè)字段的schema

val schema = StructType(

List(

StructField("id", IntegerType, true),

StructField("name", StringType, true),

StructField("age", IntegerType, true)

)

//將RDD映射到rowRDD

val rowRDD = personRDD.map(p => Row(p(0).toInt, p(1).trim, p(2).toInt))

//將schema信息應(yīng)用到rowRDD上

val personDataFrame = sqlContext.createDataFrame(rowRDD, schema)

//創(chuàng)建Properties存儲(chǔ)數(shù)據(jù)庫相關(guān)屬性

val prop = new Properties()

prop.put("user", "root")

prop.put("password", "root")

//將數(shù)據(jù)追加到數(shù)據(jù)庫

personDataFrame.write.mode("append").jdbc("jdbc:mysql://hdp08:3306/sqoopdb", "sqoopdb.person", prop)

//停止SparkContext

sc.stop()

}

　　?打包與運(yùn)行
1.用maven將程序打包

2.將Jar包提交到spark集群
/home/hadoop/apps/spark/bin/spark-submit \
--class net.togogo.sql.JdbcRDD \
--master spark://hdp08:7077 \
--jars /home/hadoop/mysql-connector-java-5.1.45.jar \
--driver-class-path /home/hadoop/mysql-connector-java-5.1.45.jar \
/home/hadoop/schema.jar

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