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
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
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