How to establish connection with HIVE using JDBC? - hadoop

Question

HOW TO CONFIGURE JDBC WITH HIVE
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;
public class table {
private static String driverName = "org.apache.hadoop.hive.mysql.jdbc.Driver";
public static void main(String[] args) throws SQLException {
// Register driver and create driver instance
try {
Class.forName(driverName);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:1000/default", "", "");
Statement stmt = con.createStatement();
stmt.executeQuery("CREATE DATABASE userdb");
// System.out.println(“Database userdb created successfully”);
con.close();
}
}
akshay#akshay:~$ javac table.java
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
akshay#akshay:~$ java table
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
java.lang.ClassNotFoundException: org.apache.hadoop.hive.mysql.jdbc.Driver
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at table.main(table.java:14)
Exception in thread "main" java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:1000/default
at java.sql.DriverManager.getConnection(DriverManager.java:689)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at table.main(table.java:20)
My hive-site.xml contains
<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
<description>MySQL JDBC driver class</description>
</property>
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://localhost/metastore?createDatabaseIfNotExist=true</value>
<description>metadata is stored in a MySQL server </description>
</property>
I have configured meta store of hive with MySQL. So what should my ConnectionURL and Drivername in JAVA connection code?
I am not getting where I am going wrong. Please provide solution for above problem.

Answer 1

For running hive queries using JDBC API's, you need to start your hiveserver2 first. Configure the thrift server port in your hive-site.xml file as shown below
<property>
<name>hive.server2.thrift.port</name>
<value>10000</value>
<description>TCP port number to listen on, default 10000</description>
</property>
Start the hiveserver2 using the command
cd $HIVE_HOME/bin
./hiveserver2
Also you need to add the below dependencies to your project.
Hive-jdbc-*-standalone.jar
hive-jdb-*.jar
hive-metastore-*.jar
hive-service-*.jar
After that try running the program. You can refer to this blog for more information on step by step procedure to run hive queries using java programs.