java JDBC 链接hive 操作实例，jdbchive

java JDBC 链接hive 操作实例，jdbchive

1.在eclipse下面 导入包，简便方式 new ->mapred project -> 右键 ->选择“Properties”->Java Build Path->Library->Add External Jars 将/usr/hive/lib的所有jar包 添加上。（因为之前的配置 所有jar包 已经包括 java链接mysql的包）。

2. 开启服务接口：

hive --service hiveserver >/dev/null 2>/dev/null & 

        或者：hive --service hiveservice

3. 编写测试代码：

package hive;

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

public class hiveTest {
	/**
	 * @XD
	 */
	private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";
	private static String sql = "";
	private static ResultSet res;
	public static void main(String[] args) throws SQLException {
		// TODO Auto-generated method stub
		try{
			Class.forName(driverName);
		}catch(ClassNotFoundException  e){
			e.printStackTrace();
			System.exit(1);
		}
		Connection conn = DriverManager.getConnection("jdbc:hive://localhost:10000/default", "", "");
		Statement stmt = conn.createStatement();
		//创建的表名
		String tablename = "test";
		
		//stmt.executeQuery(sql)和res = stmt.executeQuery(sql); 成对出现 一面出错
		/**
		 * Tips ：sql语句的 注意事项  和hive shell 里面的一致 
		 * 	sql = " drop table " 注意空格的要求 不能紧挨着书写 会出现错误
		 * 
		 * */
		sql = " drop table "+tablename;
		stmt.executeQuery(sql);
		res = stmt.executeQuery(sql);
		
		sql = " create table "+tablename+"(key int,value string)";
		sql += "row format delimited fields terminated by '\t'";
		res = stmt.executeQuery(sql);
		
		/**
		 * test.txt:(分隔符\t)
		 * 1			xd
		 * 2			xd
		 * 3			xd
		 * 
		 * */
		String filepath = "/home/hadoop/桌面/test.txt";
		sql = " load data local inpath '"+filepath+"' overwrite into table "+tablename;
		stmt.executeQuery(sql);
		res = stmt.executeQuery(sql);
		
		sql = "select * from "+tablename ;
		res = stmt.executeQuery(sql);
		while(res.next()){
			System.out.println(res.getInt(1)+"\t"+res.getString(2));
		}
		
		sql = "select * from userinfo" ;
		res = stmt.executeQuery(sql);
		while(res.next()){
			System.out.println(res.getString(1));
		}
		
		//虽然hive创建视图的时候 在hive数据仓库目里显示不出来 但是api链接的是hive数据库 可以将视图显示出来
		sql = "show tables";
		res = stmt.executeQuery(sql);
		while(res.next()){
			System.out.println(res.getString(1));
		}
	}
}

1	xd
2	xd
3	xd

1
2
3

btest
choice
classino
name_classnum //视图名
ptest
t1
test
userinfo