spark学习8.1：sparkSQL的数据库操作

 在启动spark-shell时候，必须指定 jar 和 driver类路径，这两个路径是一致的，都是mysql驱动的路径。
 

然后选择对应的jar包

import org.apache.spark.sql.SparkSession

object sparkSQLTestJDBC {
  def main(args: Array[String]): Unit = {

    //create spark commander
    val spark = SparkSession.builder().master("local").appName("sparkSQLTest").getOrCreate()

    //read
 val studentDF = spark.read.format("jdbc")
  .option("url", "jdbc:mysql://10.10.10.10:3306/dbName?serverTimezone=GMT") //IP and db name
  .option("driver", "com.mysql.jdbc.Driver")
  .option("dbtable", "student") //table name
  .option("user", "root")  //user name
  .option("password", "123456")  //password
  .load()

    //show
    studentDF.show()

  }

}

写入数据跟编程方式定义RDD一样

//for create table schema
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.types.{IntegerType, StringType, StructField, StructType}
import org.apache.spark.sql.Row

//for save connection info  
import java.util.Properties

object sparkSQLTestJDBCWrite {
  def main(args: Array[String]): Unit = {

    //create spark commander
    val spark = SparkSession.builder().appName("sparkSQLTest").master("local").getOrCreate()


    //create table schema
    val schema = StructType(List(StructField("id", IntegerType, true),
      StructField("name", StringType, true),
      StructField("score", IntegerType, true),
      StructField("course", StringType, true)
    ))

    //generate the insert data
    val insertRDD: RDD[String] = spark.sparkContext.parallelize(Array("6 墨子 66 地理", "7 孔子 86 英语", "8 非子 96 化学"))

    //split the rdd and into rows
    val insertDataDF = insertRDD.map(_.split(" "))
      .map(x => Row(x(0).trim.toInt, x(1), x(2).trim.toInt, x(3)))

    //merge
    val dataframe = spark.createDataframe(insertDataDF, schema)

    
    //for restore the connection info
    val prop = new Properties()

    prop.put("user","bigdata")
    prop.put("password","Bigdata2021")
    prop.put("driver", "com.mysql.jdbc.Driver")

    //write table
    dataframe.write.mode("append")
      .jdbc("jdbc:mysql://10.253.38.9:3306/finereport?serverTimezone=GMT","student",prop)
    

  }

}

结果校验：

ps:在指定字段数据类型时候，注意包的选择