DatabaseMetaData 接口返回数据库的信息，例如用户名、驱动程序名称、驱动程序版本、表数、视图数等。参考以下示例。

import java.sql.*;

class Dbmd {

    public static void main(String args[]) {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");

            Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "oracle");
            DatabaseMetaData dbmd = con.getMetaData();

            System.out.println("Driver Name: " + dbmd.getDriverName());
            System.out.println("Driver Version: " + dbmd.getDriverVersion());
            System.out.println("UserName: " + dbmd.getUserName());
            System.out.println("Database Product Name: " + dbmd.getDatabaseProductName());
            System.out.println("Database Product Version: " + dbmd.getDatabaseProductVersion());

            con.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

运行结果：

Driver Name: Oracle JDBC Driver
Driver Version: 10.2.0.1.0XE
Database Product Name: Oracle
Database Product Version: Oracle Database 10g Express Edition Release 10.2.0.1.0 -Production