JDBC connectivity in Hive?

[DataFlair Team]

<div class=”post”>

How to connect hive using JDBC connector to java program ?

</div>

[DataFlair Team]

Step 1:

import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;
public class HiveJdbcClient {
private static String driverName = “org.apache.hadoop.hive.jdbc.HiveDriver”;
/**
* @param args
* @throws SQLException
**/
public static void main(String[] args) throws SQLException {
try {
Class.forName(driverName);
} catch (ClassNotFoundException e){
// TODO Auto-generated catch block
e.printStackTrace();
System.exit(1);
}
Connection con = DriverManager.getConnection(“jdbc:hive://localhost:
10000/default”, “”, “”);
Statement stmt = con.createStatement();
String tableName = “testHiveDriverTable”;
stmt.executeQuery(“drop table ” + tableName);
ResultSet res = stmt.executeQuery(“create table ” + tableName + ”
(key int, value string)”);
// show tables
String sql = “show tables ‘” + tableName + “‘”;
System.out.println(“Running: ” + sql);
res = stmt.executeQuery(sql);
if (res.next()) {
System.out.println(res.getString(1));
}
// describe table
sql = “describe ” + tableName;
System.out.println(“Running: ” + sql);
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getString(1) + “t” + res.getString(2));
}
// load data into table
// NOTE: filepath has to be local to the hive server
// NOTE: /tmp/test_hive_server.txt is a ctrl-A separated file with two
 fields per line
String filepath = “/tmp/test_hive_server.txt”;
sql = “load data local inpath ‘” + filepath + “‘ into table ” + tableName;
System.out.println(“Running: ” + sql);
res = stmt.executeQuery(sql);
// select * query
sql = “select * from ” + tableName;
System.out.println(“Running: ” + sql);
res = stmt.executeQuery(sql);
while (res.next()){
System.out.println(String.valueOf(res.getInt(1)) + “t” + res.getString(2));
}
// regular hive query
sql = “select count(1) from ” + tableName;
System.out.println(“Running: ” + sql);
res = stmt.executeQuery(sql);
while (res.next()){
System.out.println(res.getString(1));
}
}
}

Step 2:

JDBC configuration in HIVE-SITE.XML

JAVAX.JDO.OPTION.CONNECTIONURL
JDBC.MYSQL://MYHOST/DBNAME?CREATEDATABASE IF NOEXIT=TRUE

JAVAX.JDO.OPTION.CONNECTDRIVERNAME
COM.MYSQL.JDBC.DRIVER

JAVAX.JDO.OPTION.CONNECTIONUSERNAME
MYDBUSERNAME

JAVAX.JDO.OPTION.CONNECTIONPASSWORD
MYDBPASSWORD

To learn more about the Hive follow: Hive Tutorial

To learn about Hive installation follow: Hive Installation

[Author]

Posts