dnet-hadoop/dhp-workflows/dhp-java-action-dbconnection/src/main/java/eu/dnetlib/oa/graph/usagestats/export/Simple.java

package eu.dnetlib.oa.graph.usagestats.export;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class Simple {

	public static void main(final String[] args) throws Exception {

		System.out.println("=============================================");
		System.out.println("Staring");
		System.out.println("=============================================");

		// Connection string that works OK
		// String connectionUrl =
		// "jdbc:hive2://iis-cdh5-test-m3.ocean.icm.edu.pl:10000/stats_wf_db_galexiou_oozie_beta;UID=spyros;PWD=XXXXXX;UseNativeQuery=1";

		// The following connectio string also works
		String connectionUrl = "jdbc:hive2://iis-cdh5-test-m3.ocean.icm.edu.pl:10000/;UseNativeQuery=1";
		String jdbcDriverName = "org.apache.hive.jdbc.HiveDriver";

		System.out.println("\n=============================================");
		System.out.println("Using Connection URL: " + connectionUrl);
		System.out.println("USing JDBC Driver " + jdbcDriverName);

		Connection con = null;

		try {
			System.out.println("Step 1");
			Class.forName(jdbcDriverName);
			System.out.println("Step 2");
			con = DriverManager.getConnection(connectionUrl);
			System.out.println("Step 3");
			Statement stmt = con.createStatement();
			System.out.println("Step 4");
			ResultSet rs = stmt.executeQuery("select personid, lastname from test_db_spyros.persons");

			System.out.println("\n== Begin Query Results ======================");

			// print the results to the console
			while (rs.next()) {
				// the example query returns one String column
				System.out.println(rs.getString(1) + " | " + rs.getString(2));
			}

			System.out.println("== End Query Results =======================\n\n");

			System.out.println("==> Drop if exists");
			// Drop table if exists
			stmt.execute("DROP TABLE IF EXISTS test_db_spyros.Persons2");

			System.out.println("==> Create table");
			// Create table
			stmt
				.execute(
					"CREATE TABLE test_db_spyros.Persons2 (personid int, lastname varchar(255), firstname varchar(255)) clustered by (personid) into 100 buckets stored as orc tblproperties('transactional'='true')");

			System.out.println("==> Insert");
			// Insert
			stmt
				.execute(
					"INSERT INTO test_db_spyros.persons2 (personid, lastname, firstname) VALUES ('1', 'ZoupZoup', 'Spyros')");

			System.out.println("==> Select 1 on persons2");
			// Select the inserted values
			rs = stmt.executeQuery("select personid, lastname, firstname from test_db_spyros.persons2");
			while (rs.next()) {
				// the example query returns one String column
				System.out.println(rs.getString(1) + " | " + rs.getString(2) + " | " + rs.getString(3));
			}

			System.out.println("==> Update");
			// Update
			stmt
				.execute(
					"UPDATE test_db_spyros.persons2 SET lastname='ZoupZoup2', firstname='Spyros2' WHERE personid=1");

			System.out.println("==> Select 2 on persons2");
			// Select the updated values
			rs = stmt.executeQuery("select personid, lastname, firstname from test_db_spyros.persons2");
			while (rs.next()) {
				// the example query returns one String column
				System.out.println(rs.getString(1) + " | " + rs.getString(2) + " | " + rs.getString(3));
			}

		} catch (SQLException e) {
			System.out.println("Ex 1");
			e.printStackTrace();
			System.out.println(e.getMessage());
		} catch (Exception e) {
			System.out.println("Ex 2");
			e.printStackTrace();
			System.out.println(e.getMessage());
		} finally {
			try {
				con.close();
			} catch (Exception e) {
				// swallow
				System.out.println("Ex 3");
				e.printStackTrace();
				System.out.println(e.getMessage());
			}
		}

		System.out.println("=============================================");
		System.out.println("Ending");
		System.out.println("=============================================");
	}
}