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版本以后org.apache.hive.jdbc.HiveDriver
private static String url = "jdbc:hive://localhost:10000/default";
// Hive 0.11.0版本以后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();
// 如果存在了就删除
String tableName = "jdbc_table";
String sql = "drop table if exists " + tableName;
stmt.execute(sql);
// 创建表
sql = "create table"
+ tableName
+ " (key string,value string) row format delimited fields terminated by ',' stored as textfile ";
stmt.execute(sql);
//加载数据
String Path="/home/hive_1.txt";
sql ="load data local inpath '"+Path+"' into table "+tableName;
stmt.execute(sql);
// 查询数据
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("没有找到驱动类");
e.printStackTrace();
} catch (SQLException e) {
System.out.println("连接Hive的信息有问题");
e.printStackTrace();
}
}
}
上面是用Java连接HiveServer，而HiveServer本身存在很多问题（比如：安全性、并发性等）；针对这些问题，Hive0.11.0版本提供了一个全新的服务：HiveServer2，这个很好的解决HiveServer存在的安全性、并发性等问题。
上面的userName和passWord是hive元数据mysql的用户名和密码
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.
参考文章：
http://www.iteblog.com/archives/846
本文出自 “点滴积累” 博客，请务必保留此出处http://tianxingzhe.blog.51cto.com/3390077/1698639
