使用java连接hive，并执行hive语句详解

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

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