package cn.spark.study.core.mycode_dataFrame;
import java.sql.DriverManager;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.api.java.function.PairFunction;
import org.apache.spark.api.java.function.VoidFunction;
import org.apache.spark.sql.DataFrame;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.RowFactory;
import org.apache.spark.sql.SQLContext;
import org.apache.spark.sql.types.DataTypes;
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;
import java.sql.Connection;
import java.sql.Statement;
import scala.Tuple2;
public class JDBCDataSource {
public static void main(String[] args) {
SparkConf conf = new SparkConf()
.setAppName("JDBCDataSource")
.setMaster("local")
;
JavaSparkContext sc = new JavaSparkContext(conf);
SQLContext sqlContext = new SQLContext(sc);
Map<String,String> options = new HashMap<String,String>();
options.put("url", "jdbc:mysql://127.0.0.1:3306/testdb");
options.put("dbtable","student_infos");
//加载表信息
DataFrame studentInfosDF = sqlContext.read().format("jdbc")
.options(options).load();
options.put("dbtable", "student_scores");
DataFrame studentScoreDF = sqlContext.read().format("jdbc")
.options(options).load();
JavaPairRDD<String, Tuple2<Integer, Integer>> result_RDD = studentInfosDF.javaRDD().mapToPair(new PairFunction<Row, String, Integer>() {
@Override
public Tuple2<String, Integer> call(Row row) throws Exception {
return new Tuple2<String, Integer>(row.getString(0),Integer.valueOf(String.valueOf(row.get(1))));
}
})
.join(studentScoreDF.javaRDD().mapToPair(new PairFunction<Row, String, Integer>() {
@Override
public Tuple2<String, Integer> call(Row row) throws Exception {
return new Tuple2<String, Integer>(row.getString(0),Integer.valueOf(String.valueOf(row.get(1))));
}
}));
// result_RDD.foreach(new VoidFunction<Tuple2<String,Tuple2<Integer,Integer>>>() {
//
// @Override
// public void call(Tuple2<String, Tuple2<Integer, Integer>> tuple)
// throws Exception {
// System.out.println(tuple._1 + ":" + tuple._2._1 + ":" + tuple._2._2);
// }
// });
JavaRDD<Row> result_RDD_ROW= result_RDD.map(new Function<Tuple2<String,Tuple2<Integer,Integer>>, Row>() {
@Override
public Row call(Tuple2<String, Tuple2<Integer, Integer>> tuple)
throws Exception {
return RowFactory.create(tuple._1,tuple._2._1,tuple._2._2);
}
});
List<StructField> list = new ArrayList<StructField>();
list.add(DataTypes.createStructField("name", DataTypes.StringType, true));
list.add(DataTypes.createStructField("age", DataTypes.IntegerType, true));
list.add(DataTypes.createStructField("score", DataTypes.IntegerType, true));
StructType st = DataTypes.createStructType(list);
DataFrame result_df = sqlContext.createDataFrame(result_RDD_ROW, st);
result_df.javaRDD().foreach(new VoidFunction<Row>() {
private static final long serialVersionUID = 1L;
@Override
public void call(Row row) throws Exception {
String sql = "insert into good_student_infos values("
+ "‘" + String.valueOf(row.getString(0)) + "‘,"
+ Integer.valueOf(String.valueOf(row.get(1))) + ","
+ Integer.valueOf(String.valueOf(row.get(2))) + ")";
System.out.println("sql:" + sql);
Class.forName("com.mysql.jdbc.Driver");
Connection conn = null;
Statement stmt = null;
try {
conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/testdb","","");
stmt = conn.createStatement();
stmt.execute(sql);
} catch (Exception e) {
e.printStackTrace();
}finally
{
if(stmt != null)
{
stmt.close();
}
if(conn != null)
{
conn.close();
}
}
}
});
}
}
数据库准备
-- create table student_info(name VARCHAR(20),age INTEGER);
-- create table studnet_scores(name VARCHAR(20),score INTEGER);
-- insert into student_info values("leo",18),("marry",17),("jack",19)
-- insert into student_scores values("leo",88),("marry",99),("jack",60)
-- ALTER TABLE student_info RENAME to student_infos;
-- create table good_student_infos(name VARCHAR(20),age INTEGER,score INTEGER)
最终生成的表
