java如何操作hive

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存储类:

package com.rxzx.hive;

public class Beacon {

private String stime;

private String uid;

private String sid;

private String pid;

public String getStime() {

return stime;

}

public void setStime(String stime) {

this.stime = stime;

}

public String getUid() {

return uid;

}

public void setUid(String uid) {

this.uid = uid;

}

public String getSid() {

return sid;

}

public void setSid(String sid) {

this.sid = sid;

}

public String getPid() {

return pid;

}

public void setPid(String pid) {

this.pid = pid;

}

@Override

public String toString() {

// TODO Auto-generated method stub

return stime+"  "+uid+"   "+sid+"  "+pid;

}

}

创建连接和关闭连接类：

package com.rxzx.hive;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class HiveJDBC {

private static Connection conn;

//初始化数据仓库连接对象

public static Connection getConnection() {

if(conn==null) {

try {

conn=DriverManager.getConnection("jdbc:hive2://192.168.2.100:10000/hive_db", "Teacher", "123456");

} catch (SQLException e) {

System.out.println("数据仓库连接失败");

e.printStackTrace();

}

}

return conn;

}

//关闭连接对象

public static void close() {

if(conn!=null) {

try {

conn.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

功能类：创建表，删除表，加载数据，数据展现到java窗口

package com.rxzx.hive;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

import java.util.function.BiConsumer;

public class BeaconDao {

//删除表

public void dropTable(String tableName) throws SQLException{

Connection conn=HiveJDBC.getConnection();

Statement stat=conn.createStatement();

stat.execute("drop table if exists "+tableName);

}

//创建表

public void createTable(String tableName,List<String> columns,String partition,String rowFormat) throws SQLException {

Connection conn=HiveJDBC.getConnection();

Statement stat=conn.createStatement();

String sql="create table if not exists "+tableName+"(";

if(columns!=null && columns.size()>0) {

String columnsql="";

for(String c:columns) {

columnsql+=c+",";

}

if(columnsql.endsWith(",")) {

columnsql=columnsql.substring(0, columnsql.length()-1);

}

sql+=columnsql+") ";

if(partition!=null && !partition.equals("")) {

sql+=partition+" ";

}

if(rowFormat!=null && !rowFormat.equals("")) {

sql+=rowFormat+" ";

}

}else {

throw new SQLException("字段不能为空");

}

stat.execute(sql);

}

public static void load(boolean local,String path,boolean overwrite,String tablename,String partition)  throws SQLException{

Connection conn=HiveJDBC.getConnection();

Statement stat=conn.createStatement();

String sql="load data "+(local?"local":"")+" inpath '"+path+"'"+(overwrite?"overwrite":"")+" into table "+tablename+" "+partition;

System.out.println(sql);

stat.execute(sql);

}

public static List<Beacon> getData(String sql)  throws SQLException{

List<Beacon> list=new ArrayList<Beacon>();

Connection conn=HiveJDBC.getConnection();

Statement stat=conn.createStatement();

ResultSet rs=stat.executeQuery(sql);

while(rs.next()) {

Beacon b=new Beacon();

b.setStime(rs.getString(1));

b.setUid(rs.getString(2));

b.setSid(rs.getString(3));

b.setPid(rs.getString(4));

list.add(b);

}

return list;

}

}

测试类：

package com.rxzx.hive;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.TreeMap;

public class TestDemo {

public static void main(String[] args) {

BeaconDao bd=new BeaconDao();

        List<String> columns=new ArrayList<String>();

        columns.add("stime string");

        columns.add("uid string");

        columns.add("sid string");

        columns.add("pid string");

try {

//bd.dropTable("beacon");

bd.createTable("beacon", columns, null, " row format delimited fields terminated by '\t' ");

//bd.load(true, "/home/Teacher/datafile/vistdata.log", false, "beacon", "");

  //List<Beacon> list=bd.getData("select * from beacon where sid='h_1009'");

  //for(Beacon b:list) { System.out.println(b.toString()); }

System.out.println("执行完成");

} catch (SQLException e) {

System.out.println("执行失败");

e.printStackTrace();

}finally {

HiveJDBC.close();

}

}

}

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