java代码操作hive是怎样的
java代码操作hive是怎样的，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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package cn.com.hivedemo.hivedemo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.apache.hadoop.hive.jdbc.HiveDriver;
/**
* Hello world!
使用java操作hive，用maven进行管理依赖
* hive --service hiveserver -p 50000 &
*/
public class App
{
public static void main( String[] args ) throws Exception
{
System.out.println( "Hello World!" );
// createTableDemo();
// insertTableDemo();
// selectDemo();
countDemo();
showTablesDemo();
}
private static final String URLHIVE = "jdbc:hive://hadoop0:50000/default";
private static Connection connection = null;
public static Connection getHiveConnection() {
if (null == connection) {
synchronized (HiveDriver.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 createTableDemo() throws SQLException {
String tweetTableSql = "create TABLE IF not EXISTS student1(name String,age int)";
System.out.println("=====createTableDemo begin========");
Statement stmt = getHiveConnection().createStatement();
stmt.execute(tweetTableSql);
stmt.close();
System.out.println("=====createTableDemo end========");
}
public static void insertTableDemo() throws SQLException {
String tweetTableSql = "LOAD DATA LOCAL INPATH '/opt/stu.txt' OVERWRITE INTO TABLE student1";
System.out.println("=====insertTableDemo begin========");
Statement stmt = getHiveConnection().createStatement();
stmt.execute(tweetTableSql);
stmt.close();
System.out.println("=====insertTableDemo end========");
}
public static void selectDemo() throws SQLException {
String tweetTableSql = "select * from student1";
System.out.println("=====selectDemo begin========");
Statement stmt = getHiveConnection().createStatement();
ResultSet rs = stmt.executeQuery(tweetTableSql);
while(rs.next()){
System.out.println(rs.getString(1)+rs.getString(2));
}
System.out.println("=====selectDemo end========");
}
public static void selectDemo1() throws SQLException {
String tweetTableSql = "select * from student1 where name='MM'";
System.out.println("=====selectDemo begin========");
Statement stmt = getHiveConnection().createStatement();
ResultSet rs = stmt.executeQuery(tweetTableSql);
while(rs.next()){
System.out.println(rs.getString(1)+rs.getString(2));
}
System.out.println("=====selectDemo end========");
}
public static void countDemo() throws SQLException {
String tweetTableSql = " select count(*) from student1 ";
System.out.println("=====countDemo begin========");
Statement stmt = getHiveConnection().createStatement();
ResultSet rs = stmt.executeQuery(tweetTableSql);
while(rs.next()){
System.out.println(rs.getString(1));
}
System.out.println("=====countDemo end========");
}
public static void showTablesDemo() throws SQLException {
String tweetTableSql = " show tables ";
System.out.println("=====showTablesDemo begin========");
Statement stmt = getHiveConnection().createStatement();
ResultSet rs = stmt.executeQuery(tweetTableSql);
while(rs.next()){
System.out.println(rs.getString(1));
}
System.out.println("=====showTablesDemo end========");
}
/**
* JDK使用1.6.0.x
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/hadoop/hive/metastore/api/MetaException : Unsupported major.minor version 51.0
换成1.8就OK
*
*/
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