HiveJdbcClient.java

package com.hangum.tadpole.engine.connect;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class HiveJdbcClient {
	private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";

	/**
	 * @param args
	 * @throws SQLException
	 */
	public static void main(String[] args) throws SQLException {
		try {
			Class.forName(driverName);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			System.exit(1);
		}
		
		System.out.println("===Connection start===========================================");
		Connection con = DriverManager.getConnection("jdbc:hive2://localhost:10002/testdb", "hangum", "xxx");
		System.out.println("===Connection send===========================================");
		
		Statement stmt = con.createStatement();
		String tableName = "testHiveDriverTable";
		stmt.executeQuery("drop table " + tableName);
		ResultSet res = stmt.executeQuery("create table " + tableName + " (key int, value string)"); 
		// show tables
		String sql = "show tables";// '" + tableName + "'";
		System.out.println("Running: " + sql);
		res = stmt.executeQuery(sql);
		if (res.next()) {
			System.out.println(res.getString(1));
		}
		// describe table
		sql = "describe " + tableName;
		System.out.println("Running: " + sql);
		res = stmt.executeQuery(sql);
		
		while (res.next()) {
			System.out.println(res.getString(1) + "\t" + res.getString(2));
		}
		
		sql = "insert into testHiveDriverTable (key, value) value (3, 'aa')";
		System.out.println("Running: " + sql);
		stmt.executeUpdate(sql);
		
		sql = "select key from testHiveDriverTable";
		System.out.println("Running: " + sql);
		res = stmt.executeQuery(sql);
		
//		while (res.next()) {
//			System.out.println(res.getString(0));
//		}
		

//		// load data into table
//		// NOTE: filepath has to be local to the hive server
//		// NOTE: /tmp/a.txt is a ctrl-A separated file with two fields per line
//		String filepath = "/tmp/a.txt";
//		sql = "load data local inpath '" + filepath + "' into table "
//				+ tableName;
//		System.out.println("Running: " + sql);
//		res = stmt.executeQuery(sql);
//
//		// select * query
//		sql = "select * from " + tableName;
//		System.out.println("Running: " + sql);
//		res = stmt.executeQuery(sql);
//		while (res.next()) {
//			System.out.println(String.valueOf(res.getInt(1)) + "\t"
//					+ res.getString(2));
//		}
//
//		// regular hive query
//		sql = "select count(1) from " + tableName;
//		System.out.println("Running: " + sql);
//		res = stmt.executeQuery(sql);
//		while (res.next()) {
//			System.out.println(res.getString(1));
//		}
	}
}