HIVE JDBC連線詳解
阿新 • • 發佈:2019-01-24
package org.conan.myhadoop.mr; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class HiveJDBCConnection { private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver"; // Hive 0.11.0版本以後org.apache.hive.jdbc.HiveDriver private static String url = "jdbc:hive://localhost:10000/default"; // Hive 0.11.0版本以後jdbc:hive2://localhost:10000/default private static String userName = ""; private static String passWord = ""; public static void main(String[] args) { try { Class.forName(driverName); Connection con = DriverManager.getConnection("url", "userName", "passWord"); Statement stmt = con.createStatement(); // 如果存在了就刪除 String tableName = "jdbc_table"; String sql = "drop table if exists " + tableName; stmt.execute(sql); // 建立表 sql = "create table" + tableName + " (key string,value string) row format delimited fields terminated by ',' stored as textfile "; stmt.execute(sql); //載入資料 String Path="/home/hive_1.txt"; sql ="load data local inpath '"+Path+"' into table "+tableName; stmt.execute(sql); // 查詢資料 sql ="select * from "+tableName; ResultSet res = stmt.executeQuery(sql); while(res.next()){ System.out.println(res.getString(1)+"\t"+res.getString(1)); } } catch (ClassNotFoundException e) { System.out.println("沒有找到驅動類"); e.printStackTrace(); } catch (SQLException e) { System.out.println("連線Hive的資訊有問題"); e.printStackTrace(); } } }
上面是用Java連線HiveServer,而HiveServer本身存在很多問題(比如:安全性、併發性等);針對這些問題,Hive0.11.0版本提供了一個全新的服務:HiveServer2,這個很好的解決HiveServer存在的安全性、併發性等問題。
上面的userName和passWord是hive元資料mysql的使用者名稱和密碼
Use Cases: Hive CLI versus Beeline
The following section focuses on the common uses of Hive CLI/HiveServer1 and how you can migrate to Beeline/HiveServer2 in each case.
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