apache hive - Hive Drop Database - hive tutorial - hadoop hive - hadoop hive - hiveql

Drop Database Statement

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

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Syntax

DROP DATABASE StatementDROP (DATABASE|SCHEMA) [IF EXISTS] database_name 
[RESTRICT|CASCADE];

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• The following queries given are used to drop a database.
• Hence we can assume that the database name is userdb

hive> DROP DATABASE IF EXISTS userdb;

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• The following query drops the database which is done using CASCADE.
• This means that dropping the respective tables before dropping the database.

hive> DROP DATABASE IF EXISTS userdb CASCADE;

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• The following query given drops the database using SCHEMA.

hive> DROP SCHEMA userdb;

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• This clause was added in Hive 0.6.

JDBC Program

• The JDBC program to drop a database is given below.

Sample Code

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();
   }
}

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• These are some of the commands which are given to compile and execute this program.

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Sample code

$ javac HiveDropDb.java
$ java HiveDropDb

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Output:

Drop userdb database successful.

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