Java 操作Hive功能代码

第一步：pom.xml 依赖jar包

        
			org.apache.hive
			hive-jdbc
			3.1.0
		
        
			org.apache.hadoop
			hadoop-common
			3.1.0
		

第二步： 功能代码：

package com.zzg.hive;

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

public class HiveApplication {
		// 驱动，固定的
		private static String driverName = "org.apache.hive.jdbc.HiveDriver";
		// 默认就是10000端口，ip地址使用hive服务器的
	    private static String url = "jdbc:hive2://192.168.60.204:10000/default";
	    // hive连接的用户名和密码，默认就算是下面这两个
	    private static String user = "root";
	    private static String password = "123456";

	    // 公共使用的变量
	    private static Connection conn = null;
	    private static Statement stmt = null;
	    private static ResultSet rs = null;
		  
	    // 加载驱动、创建连接
	    public static void init() throws Exception {
	        Class.forName(driverName);
	        conn = DriverManager.getConnection(url,user,password);
	        stmt = conn.createStatement();
	    }
	    
	    // 释放资源
	    public static void destory() throws Exception {
	        if ( rs != null) {
	            rs.close();
	        }
	        if (stmt != null) {
	            stmt.close();
	        }
	        if (conn != null) {
	            conn.close();
	        }
	    }
	    
	    // 测试代码（每次都需要现在加载，执行万后释放）
	    public static void main(String[] args) throws Exception {
	    		init();
	    		// 创建表功能通过
//	    		createTable();
	    		// 显示表名称
//	    		showTables();
	    		// 显示表描述
//	    		descTable();
	    		// 本地数据导入
//	    		loadData();
	    		// 查询数据
//	    		selectData();
	    		// 运行mapreduce作业
	    		countData();
	    		// 执行删除
//	    		dropTable();
	    		destory();
		}
	    
	    // 创建表
	    public static void createTable() throws Exception {
	        String sql = "create table pokes (foo int, bar string) row format delimited fields terminated by ','";
	        stmt.execute(sql);
	    }

	    // 查询所有表
	    public static void showTables() throws Exception {
	        String sql = "show tables";
	        rs = stmt.executeQuery(sql);
	        while (rs.next()) {
	            System.out.println(rs.getString(1));
	        }
	    }

	    // 查看表结构
	    public static void descTable() throws Exception {
	        String sql = "desc pokes";
	        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 = "/usr/local/data/pokes.txt";
	        String sql = "load data local inpath '" + filePath + "' overwrite into table pokes";
	        stmt.execute(sql);
	    }

	    // 查询数据
	    public static void selectData() throws Exception {
	        String sql = "select * from pokes";
	        rs = stmt.executeQuery(sql);
	        while (rs.next()) {
	            System.out.println(rs.getString("foo") + "\t\t" + rs.getString("bar"));
	        }
	    }

	    // 统计查询（会运行mapreduce作业）
	    public static void countData() throws Exception {
	        String sql = "select count(1) from pokes";
	        rs = stmt.executeQuery(sql);
	        while (rs.next()) {
	            System.out.println(rs.getInt(1) );
	        }
	    }

	    // 删除数据库表
	    public static void dropTable() throws Exception {
	        String sql = "drop table if exists pokes";
	        stmt.execute(sql);
	    }
				
}