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Big Data - Hive

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Lesson Description


Lession - #1133 Hive Drop Database


Drop Database Statement
Drop Database is a statement that drops all the tables and deletes the database. Its syntax is as follows:

DROP DATABASE StatementDROP (DATABASE|SCHEMA>
[IF EXISTS] database_name [RESTRICT|CASCADE];
The following queries are used to drop a database. Let us assume that the database name is userdb.

hive> DROP DATABASE IF EXISTS userdb;
The following query drops the database using CASCADE. It means dropping respective tables before dropping the database.

hive> DROP DATABASE IF EXISTS userdb CASCADE;
The following query drops the database using SCHEMA.

hive> DROP SCHEMA userdb;
This clause was added in Hive 0.6.
JDBC Program
The JDBC program to drop 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 HiveDropDb {
   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("DROP DATABASE userdb">
; System.out.println(“Drop userdb database successful.”>
; con.close(>
; } }
Save the program in a file named HiveDropDb.java. Given below are the commands to compile and execute this program.

$ javac HiveDropDb.java
$ java HiveDropDb
/
Output:

Drop userdb database successful.