HIVE JDBC

最新推荐文章于 2024-08-27 10:35:24 发布

tobyqiu

最新推荐文章于 2024-08-27 10:35:24 发布

阅读量454

点赞数

CC 4.0 BY-SA版权

分类专栏： hadoop sqoop hive 文章标签： HIVE JDBC

本文链接：https://blog.youkuaiyun.com/tobyqiu/article/details/84456605

hadoop sqoop hive 专栏收录该内容

17 篇文章

订阅专栏

本文介绍如何启动 HiveServer 和 Hive Web Interface，并通过一个示例 Java 类 HiveJdbcClient 展示如何利用 JDBC 连接 Hive，执行基本的 SQL 操作，包括创建表、加载数据、查询等。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

第一步要开 HIVE server

//jdbc 端口
hive --service hiveserver
//web 端口
hive --service hwi


//如果后台运行 就应该加

nohup hive --service hiveserver
nohup hive --service hwi


//后台后 要kill的话 只能 用 kill

netstat -ap |grep 9999
netstat -nlp | grep 10000

kill -9 ***

然后就是连JDBC了

package org.apache.hadoop.examples;
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;


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) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      System.exit(1);
    }
    Connection con = DriverManager.getConnection("jdbc:hive://10.221.62.68:10000/default", "", "");
    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));
    }

    // 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));
    }
  }
}