软件2班20240513-编程知识

软件2班20240513

第三次作业
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package com.yanyu;import java.sql.*;
import java.util.ResourceBundle;public class JDBCTest01 {public static void main(String[] args) {ResourceBundle bundle = ResourceBundle.getBundle("com/resources/db");//  ctrl  alt   vString driver = bundle.getString("driver");String url = bundle.getString("url");String user = bundle.getString("user");String password = bundle.getString("password");Connection con = null;Statement st = null;ResultSet rs = null;
//      注册驱动try {Class.forName(driver);//ctrl  p
//            获取链接对象con = DriverManager.getConnection(url, user, password);//        alt   enter
//        ctrl   单机
//        异常（√）    方法未重写（错）
//            System.out.println(con);com.mysql.cj.jdbc.ConnectionImpl@4ae82894
//            关闭自动  提交事务con.setAutoCommit(false);//            操作对象st = con.createStatement();
//            SQL语句bString sql = "insert into t_user values(1,'yanyu')";
//            执行SQL语句st.execute(sql);//            提交  事务con.commit();} catch (ClassNotFoundException e) {
//            回滚事务if (con != null) {try {con.rollback();} catch (SQLException ex) {throw new RuntimeException(ex);}}throw new RuntimeException(e);} catch (SQLException e) {throw new RuntimeException(e);} finally {
//            关流  操作
//              rs   st    conif (rs != null) {
//                判断变量 是否为  nulltry {rs.close();} catch (SQLException e) {throw new RuntimeException(e);}}if (st != null) {try {st.close();} catch (SQLException e) {throw new RuntimeException(e);}}if (con != null) {try {con.close();} catch (SQLException e) {throw new RuntimeException(e);}}}}
}