After data analysis, it will definitely be implemented. Generally, it will be lost in hdfs, or a common relational database. Here, I will use mysql to tell you about it.
sql is actually easy to operate, just call the method
val prop=new java.util.Properties()
prop.put("driver","com.mysql.jdbc.Driver")
prop.put("user","root")
prop.put("password","root")
resultDF.write.jdbc("jdbc:mysql://localhost:3306/test?createDatabaseIfNotExist=true&characterEncoding=UTF-8","student",prop)
If you are using Core, then call foreachRDD to write jdbc is OK, the following is an example of how I save wordcount
tuple.foreachRDD(rdd=>{
rdd.foreach(word=>{
Class.forName("com.mysql.jdbc.Driver")
//获取mysql连接
val conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "")
//把数据写入mysql
try {
var totalcount = word._2
var sql = "";
var querysql="select count from wordcount where titleName='"+word._1+"'"
val queryresult: ResultSet = conn.prepareStatement(querysql).executeQuery()
//存在更新，不存在添加
if(queryresult.next()){
totalcount = queryresult.getString("count").toInt+word._2
sql = "update wordcount set count='"+totalcount+"' where titleName='"+word._1+"'"
}else{
sql = "insert into wordcount (titleName,count) values ('" + word._1 + "','" + totalcount + "')"
}
conn.prepareStatement(sql).executeUpdate()
println("保存结束--------------------------------------------------------------")
} finally {
conn.close()
}
})
})