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

hive> DROP DATABASE IF EXISTS userdb;

hive> DROP DATABASE IF EXISTS userdb CASCADE;

hive> DROP SCHEMA userdb;

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 {

      // 注册驱动并创建驱动实例
      Class.forName(driverName);

      // 获取连接
      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();
   }
}

$ javac HiveDropDb.java
$ java HiveDropDb

Drop userdb database successful.