JDBC練習五

/*執行DQL語句 */import java.sql.*; import java.util.*;public class JDBCTest05 {public static void main(String[] args) {// 1、注冊驅動// 2、建立連接// 3、獲取數據庫操作對象// 4、執行sql語句// 5、獲取查詢結果集// 6、釋放資源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);*//*// 按下標取出，程序不健壯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();}}}} }

運行結果:

總結

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