ハイブAPI操作（アクティブプロテスト）

package com.sheng.hive;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.hadoop.hive.ql.parse.HiveParser_IdentifiersParser.precedenceAmpersandExpression_return;

/**
 * Hive JDBC操作
 */
public class HiveJDBC {

	public static final String DRIVER_NAME = "org.apache.hive.jdbc.HiveDriver";
	public static final String URL = "jdbc:hive2://HoodpNode3:2181,HoodpNode2:2181,HoodpNode4:2181/default;serviceDiscoveryMode=zooKeeper;zooKeeperNamespace=hiveserver2_zk";
	//public static final String URL ="jdbc:hive2://hpNode1:10000/default";
	public static final String USER_NAME = "zx";
	public static final String PASSWORD = "123456";

	private static Connection conn = null;
	private static Statement stmt = null;
	private static ResultSet rs = null;
	
	
	public static void main(String[] args) throws Exception {
		init();
		//createDatabase("myhive");
		//showDatabases();
		//dropDatabase("myhive");
		//showTables("mystudent");
		//查询表结构
		//descTable("mystudent","student");
		//dropTable("mystudent","part_test_2 ");
		//createTable("mystudent","part_test_2 ");
		countData("mystudent","student");
		destory();
	}
	/**
	 * 加载驱动,创建连接
	 * @throws ClassNotFoundException 
	 * 
	 * @throws Exception
	 */
	private static void init() throws ClassNotFoundException {
			try {
				Class.forName(DRIVER_NAME);
				conn = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
				stmt = conn.createStatement();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			
		
	}

	/**
	 * 创建数据库
	 * 
	 * @param databaseName
	 * @throws Exception 
	 */
	public static void createDatabase(String databaseName) throws Exception {
		String sql = "create database "+databaseName;
        System.out.println("Running: " + sql);
        stmt.execute(sql);
        System.out.println("创建成功："+databaseName);
	}

	/**
	 * 查询所有数据库
	 * 
	 * @return
	 */
	public static void showDatabases()throws Exception {
		 String sql = "show databases";
	        System.out.println("Running: " + sql);
	        rs = stmt.executeQuery(sql);
	        while (rs.next()) {
	            System.out.println(rs.getString(1));
	        }
	}

	/**
	 * 删除数据库
	 * 
	 * @param databaseName
	 */
	public static void dropDatabase(String databaseName) throws Exception{
		 String sql = "drop database if exists "+databaseName;
		 System.out.println(sql);
	      System.out.println("Running: " + sql);
	      stmt.execute(sql);
	      System.out.println("删除数据库成功"+databaseName);
		
	}

	/**
	 * 创建表
	 * 
	 * @param createTableSql
	 */
	public static void createTable(String databaseName,String createTableSql)throws Exception {
		String usesql = " use "+databaseName;
        System.out.println("Running: " + usesql);
        stmt.execute(usesql);
		
		 String sql = "create table "+createTableSql+"(\n" +
                 "empno int,\n" +
                 "ename string,\n" +
                 "job string,\n" +
                 "mgr int,\n" +
                 "hiredate string,\n" +
                 "sal double,\n" +
                 "comm double,\n" +
                 "deptno int\n" +
                 ")\n" +
              "row format delimited fields terminated by '\\t'";
		 System.out.println("Running: " + sql);
		 stmt.execute(sql);
		 System.out.println("创建"+createTableSql+"成功");
	}

	/**
	 * 查询所有表
	 * 
	 * @return
	 */
	public static void showTables(String databaseName)throws Exception {
		String usesql = " use "+databaseName;
        System.out.println("Running: " + usesql);
        stmt.execute(usesql);
        
		String sql = " show tables";
        System.out.println("Running: " + sql);
        rs = stmt.executeQuery(sql);
        while (rs.next()) {
            System.out.println(rs.getString(1));
        }
		
	}

	/**
	 * 查看表结构
	 * 
	 * @param databaseName
	 * @param tableName
	 * @return
	 */
	public static void descTable(String databaseName, String tableName)throws Exception {
		String usesql = " use "+databaseName;
        System.out.println("Running: " + usesql);
        stmt.execute(usesql);
		
		
		String sql = "desc "+tableName;
        System.out.println("Running: " + sql);
        rs = stmt.executeQuery(sql);
        while (rs.next()) {
            System.out.println(rs.getString(1) + "\t" + rs.getString(2));
        }
		
	}
	/**
	 * 加载数据
	 * 
	 */
    public static void loadData() throws Exception {
        String filePath = "/home/hadoop/data/emp.txt";
        String sql = "load data local inpath '" + filePath + "' overwrite into table emp";
        System.out.println("Running: " + sql);
        stmt.execute(sql);
    }

	/**
	 * 查询数据
	 * 
	 * @param selectSql
	 * @return
	 * 
	 */
	public static List<String> selectData(String selectSql) {
		return null;
		
	} 

	/**
	 * 删除数据库表
	 * 
	 * @param databaseName
	 * @param tableName
	 */
	public static void dropTable(String databaseName, String tableName)throws Exception {
		String usesql = " use "+databaseName;
        System.out.println("Running: " + usesql);
        stmt.execute(usesql);
		
		String sql = "drop table if exists "+tableName;
        System.out.println("Running: " + sql);
        stmt.execute(sql);
        System.out.println("删除"+tableName+"成功");
	}
	// 统计查询（会运行mapreduce作业）
    public static void countData(String databasesName,String tableName) throws Exception {
    	String usesql = " use "+databasesName;
        System.out.println("Running: " + usesql);
        stmt.execute(usesql);
    	
    	String sql = "select count(1) from "+tableName+"";
        System.out.println("Running: " + sql);
        rs = stmt.executeQuery(sql);
        while (rs.next()) {
            System.out.println("查询总条数为："+rs.getInt(1) );
        }
    }
	
	/**
	 * 释放资源
	 */
	private static void destory() {
		try {
			if (rs != null) {
				rs.close();
			}
			if (stmt != null) {
				stmt.close();
			}
			if (conn != null) {
				conn.close();
			}
		} catch (SQLException e) {
			System.out.println(e);
//			Object object = AbnormalUtils.getAbnormal(e);
//			System.err.println(object);
		}
	}

}