java的怎么操作spark的dataframe
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t java.util.Properties;
import org.apache.log4j.Logger;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.sql.DataFrame;
import org.apache.spark.sql.SQLContext;
import org.apache.spark.sql.SaveMode;
public class Demo_Mysql3 {
private static Logger logger = Logger.getLogger(Demo_Mysql2.class);
public static void main(String[] args) {
import org.apache.log4j.Logger;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.sql.DataFrame;
import org.apache.spark.sql.SQLContext;
import org.apache.spark.sql.SaveMode;
public class Demo_Mysql3 {
private static Logger logger = Logger.getLogger(Demo_Mysql2.class);
public static void main(String[] args) {
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