使用java连接hive，并执行hive语句详解

时间：2024-01-12 17:51:50

安装hadoop 和 hive我就不多说了，网上太多文章 自己看去

首先，在机器上打开hiveservice

hive --service hiveserver -p 50000 &

打开50000端口，然后java就可以使用java连了，需要的jar包我发个图片

使用java连接hive，并执行hive语句详解

就这多jar包，必须的

不多说，直接上代码

package asia.wildfire.hive.service;

import java.sql.*;

import java.sql.Date;

import java.text.SimpleDateFormat;

import java.util.*;

/**

 * User: liuxiaochen

 * Date: 13-9-24

 * Time: 下午5:47

 * 修改描述

 */

public class HiveService {

    private static final String URLHIVE = "jdbc:hive://ip:50000/default";

    private static Connection connection = null;

    public static Connection getHiveConnection() {

        if (null == connection) {

            synchronized (HiveService.class) {

                if (null == connection) {

                    try {

                        Class.forName("org.apache.hadoop.hive.jdbc.HiveDriver");

                        connection = DriverManager.getConnection(URLHIVE, "", "");

                    } catch (SQLException e) {

                        e.printStackTrace();

                    } catch (ClassNotFoundException e) {

                        e.printStackTrace();

                    }

                }

            }

        }

        return connection;

    }

    public static void createTable() throws SQLException {

        String tweetTableSql = "DROP TABLE IF EXISTS hive_crm_tweet2222";

        String createTable1 = "CREATE EXTERNAL TABLE hive_crm_tweet2222(tweet_id string, cuser_id string, created_at bigint, year bigint, month bigint, day bigint, hour bigint, text string, comments_count bigint, reposts_count bigint, source string, retweeted_id string, post_type string, sentiment string, positive_tags_string string, predict_tags_string string, tags_string string) STORED BY 'org.apache.hadoop.hive.dynamodb.DynamoDBStorageHandler' TBLPROPERTIES (\"dynamodb.table.name\" = \"crm_tweet\",\"dynamodb.column.mapping\" = \"tweet_id:tweet_id,cuser_id:cuser_id,created_at:created_at,year:year,month:month,day:day,hour:hour,text:text,comments_count:comments_count,reposts_count:reposts_count,source:source,retweeted_id:retweeted_id,post_type:post_type,sentiment:sentiment,positive_tags_string:positive_tags_string,predict_tags_string:predict_tags_string,tags_string:tags_string\")";

        String commentTableSql = "DROP TABLE IF EXISTS hive_tweet_comment2222";

        String createTable2 = "CREATE EXTERNAL TABLE hive_tweet_comment2222(tweet_id string,comment_id string, cuser_id string, user_id string, created_at bigint, year bigint, month bigint, day bigint, hour bigint, text string, comments_count bigint, reposts_count bigint, source string, topic_id string, post_type string, sentiment string) STORED BY 'org.apache.hadoop.hive.dynamodb.DynamoDBStorageHandler' TBLPROPERTIES (\"dynamodb.table.name\" = \"crm_tweet_comment\",\"dynamodb.column.mapping\" = \"tweet_id:tweet_id,comment_id:comment_id,cuser_id:cuser_id,user_id:user_id,created_at:created_at,year:year,month:month,day:day,hour:hour,text:text,comments_count:comments_count,reposts_count:reposts_count,source:source,topic_id:tweet_id,post_type:post_type,sentiment:sentiment\")";

        String retweetTableSql = "DROP TABLE IF EXISTS hive_tweet_retweet2222";

        String createTable3 = "CREATE EXTERNAL TABLE hive_tweet_retweet2222(tweet_id string, cuser_id string, user_id string, retweet_id string, created_at BIGINT, year BIGINT, month BIGINT, day BIGINT, hour BIGINT, text string, comments_count BIGINT, reposts_count BIGINT, source string, topic_id string, verified_type BIGINT, post_type string, sentiment string) STORED BY 'org.apache.hadoop.hive.dynamodb.DynamoDBStorageHandler' TBLPROPERTIES (\"dynamodb.table.name\" = \"crm_tweet_retweet\",\"dynamodb.column.mapping\" = \"tweet_id:tweet_id,cuser_id:cuser_id,user_id:user_id,retweet_id:retweet_id,created_at:created_at,year:year,month:month,day:day,hour:hour,text:text,comments_count:comments_count,reposts_count:reposts_count,source:source,topic_id:tweet_id,verified_type:verified_type,post_type:post_type,sentiment:sentiment\")";

        Statement stmt = getHiveConnection().createStatement();

        stmt.executeQuery(tweetTableSql);

        stmt.executeQuery(createTable1);

        stmt.executeQuery(commentTableSql);

        stmt.executeQuery(createTable2);

        stmt.executeQuery(retweetTableSql);

        stmt.executeQuery(createTable3);

    }

    public static void selectTweet() throws SQLException {

        long aaa = System.currentTimeMillis();

        long start = DateUtils.getNDaysAgo(DateUtils.getMidNight(), 15).getTime().getTime();

        long end = DateUtils.getNDaysAgo(DateUtils.getMidNight(), 13).getTime().getTime();

        String sql = "select cuser_id, count(*) as tw_hour, year, month, day from hive_crm_tweet2222 where created_at > ? and created_at < ? and cuser_id = ? group by cuser_id, year, month, day, hour";

        PreparedStatement pstm = getHiveConnection().prepareStatement(sql);

        pstm.setLong(1, start);

        pstm.setLong(2, end);

        pstm.setString(3, "2176270443");

        ResultSet rss = pstm.executeQuery();

        while (rss.next()) {

            System.out.println("1: " + rss.getString("cuser_id") + "   2: " + rss.getInt("tw_hour") + "   3: " + rss.getInt("year") + "   4: " + rss.getInt("month") + "   5: " + rss.getInt("day"));

        }

        System.out.println(System.currentTimeMillis() - aaa);

    }

    public static void selectTweet22() throws SQLException {

        long aaa = System.currentTimeMillis();

        long start = DateUtils.getNDaysAgo(DateUtils.getMidNight(), 15).getTime().getTime();

        long end = DateUtils.getNDaysAgo(DateUtils.getMidNight(), 13).getTime().getTime();

        String sql = "select cuser_id, created_at, tweet_id from hive_crm_tweet2222 where created_at > ? and created_at < ? and cuser_id = ?";

        PreparedStatement pstm = getHiveConnection().prepareStatement(sql);

        pstm.setLong(1, start);

        pstm.setLong(2, end);

        pstm.setString(3, "2176270443");

        ResultSet rss = pstm.executeQuery();

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH");

        while (rss.next()) {

            long cc = Long.valueOf(String.valueOf(rss.getInt("created_at")) + "000");

            java.util.Date date = new java.util.Date(cc);

            System.out.println(dateFormat.format(date));

            System.out.println(rss.getString("cuser_id") + " " + rss.getString("tweet_id"));

        }

        System.out.println(System.currentTimeMillis() - aaa);

    }

    public static void main(String[] args) throws ClassNotFoundException, SQLException {

//        Class.forName("org.apache.hadoop.hive.jdbc.HiveDriver");

//        String querySQL = "SELECT a.* FROM test_time a";

//

//        Connection con = DriverManager.getConnection(URLHIVE, "", "");

//        Statement stmt = con.createStatement();

//        ResultSet res = stmt.executeQuery(querySQL);   // 执行查询语句

//

//        while (res.next()) {

//            System.out.println("Result: key:" + res.getString(1) + "  –>  value:" + res.getString(2));

//        }

        selectTweet22();

//        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH");

//        System.out.println(dateFormat.format(new java.util.Date()));

    }

}

代码如上，就这么多，当然复杂的逻辑，还需要你自己处理，谢谢

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