时间：2021-07-01 10:21:17 帮助过：16人阅读
val jdbcDF = spark.read.format("jdbc").option("url", "jdbc:mysql://hadoop000:3306").option("dbtable", "hive.dept").option("user", "root").option("password", "123456").load()
jdbcDF.createOrReplaceTempView("dept")
val hiveDF = sql("SELECT * FROM emp")
val sqlDF =?sql("SELECT * FROM emp e JOIN dept d ON e.deptno = d.deptno").show
sqlDF.write.format("json").save("file:///empJoinDept.json")Spark SQL读取MySQL的dept和hive的emp表，做join和分组查询，后写到json
标签：read show user 读取 write mys mysql roo orm