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Big Data - Hive

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Lesson Description


Lession - #1130 Hive Create Database


Create Database Statement
Create Database is a statement used to create a database in Hive. A database in Hive is a namespace or a collection of tables. The syntax for this statement is as follows:

CREATE DATABASE|SCHEMA [IF NOT EXISTS] <database name>
Here, IF NOT EXISTS is an optional clause, which notifies the user that a database with the same name already exists. We can use SCHEMA in place of DATABASE in this command. The following query is executed to create a database named userdb:

hive> CREATE DATABASE [IF NOT EXISTS] userdb;
or

hive> CREATE SCHEMA userdb;
The following query is used to verify a databases list:

hive> SHOW DATABASES;
default
userdb
JDBC Program
The JDBC program to create a database is given below.

import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;

public class HiveCreateDb {
   private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";
   
   public static void main(String[] args>
throws SQLException { // Register driver and create driver instance Class.forName(driverName>
; // get connection Connection con = DriverManager.getConnection("jdbc:hive://localhost:10000/default", "", "">
; Statement stmt = con.createStatement(>
; stmt.executeQuery("CREATE DATABASE userdb">
; System.out.println(“Database userdb created successfully.”>
; con.close(>
; } }
Save the program in a file named HiveCreateDb.java. The following commands are used to compile and execute this program.

$ javac HiveCreateDb.java
$ java HiveCreateDb
Output:

Database userdb created successfully.