JDBC练习五

/*执行DQL语句
*/import java.sql.*;
import java.util.*;public class JDBCTest05 {public static void main(String[] args) {// 1、注册驱动// 2、建立连接// 3、获取数据库操作对象// 4、执行sql语句// 5、获取查询结果集// 6、释放资源Connection conn = null;Statement stmt = null;ResultSet rs = null;try{ResourceBundle rb = ResourceBundle.getBundle("jdbc");String driver = rb.getString("driver");String url = rb.getString("url");String user = rb.getString("user");String password = rb.getString("password");Class.forName(driver);conn = DriverManager.getConnection(url,user,password);stmt = conn.createStatement();rs = stmt.executeQuery("select * from student");while(rs.next()){/*String studentid = rs.getString(1);String studentname = rs.getString(2);System.out.println(studentid + "," + studentname);*//*// 按下标取出，程序不健壮String studentid = rs.getString("studentid");String studentname = rs.getString("studentname");System.out.println(studentid + "," + studentname);*//*// 以指定的格式取出int studentid = rs.getInt(1);String studentname = rs.getString(2);System.out.println(studentid + "," + studentname);*/int studentid = rs.getInt("studentid");String studentname = rs.getString("studentname");System.out.println(studentid + "," + studentname);}} catch(Exception e){e.printStackTrace();}finally{if(rs != null){try{rs.close();} catch (Exception e){e.printStackTrace();}}if(stmt != null){try{stmt.close();} catch (Exception e){e.printStackTrace();}}if(conn != null){try{conn.close();} catch (Exception e){e.printStackTrace();}}}}
}

运行结果: