CREATE DATABASE|SCHEMA [IF NOT EXISTS] <database name>

hive> CREATE DATABASE [IF NOT EXISTS] userdb;

hive> CREATE SCHEMA userdb;

hive> SHOW DATABASES;
default
userdb

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 {
      // 注册驱动程序并创建驱动程序实例

      Class.forName(driverName);
      // 获取连接

      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();
   }
}

$ javac HiveCreateDb.java
$ java HiveCreateDb

Database userdb created successfully.