JDBC PreparedStatement接口完成增删改

package JDBC;

import java.sql.*;
import java.util.ResourceBundle;

public class JDBC_prestatement {
    public static void main(String[] args){
        Connection conn = null;
        PreparedStatement ps = null;
        //同步替换变量名shift+F6
        ResultSet rs = null;
        //资源绑定器
        ResourceBundle bundle = ResourceBundle.getBundle("resourses/db");
        String driver= bundle.getString("driver");
        String url = bundle.getString("url");
        String user = bundle.getString("user");
        String password = bundle.getString("password");


        try{
            //1.注册驱动的第二种方式：类加载注册
//            Class.forName("com.mysql.jdbc.Driver");//可以写到配置文件当中
            Class.forName(driver);
            //2.获取连接
//            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/trade_for_book","root","002415");
            conn = DriverManager.getConnection(url,user,password);
            //3.获取数据库操作对象
//            实现插入
//            String sql = "insert into t_user(login_name,login_pwd,real_name) values (?,?,?)";
//            ps = conn.prepareStatement(sql);
//            ps.setString(1,"admin_01");
//            ps.setString(2,"002415");
//            ps.setString(3,"xx03");
//            实现更新
//            String sql = "update t_user set login_name = ? where login_name = ?";
//            ps = conn.prepareStatement(sql);
//            ps.setString(1,"fuuuuuk");
//            ps.setString(2,"admin_01");
//            实现删除
            String sql = "delete from t_user where login_name = ?";
            ps = conn.prepareStatement(sql);
            ps.setString(1,"fuuuuuk");
            //4.执行sql语句
            int count = ps.executeUpdate();
            System.out.println(count);
        }catch(Exception e){
            e.printStackTrace();

        }finally {
            if (rs != null){
                try{
                    rs.close();
                }catch(SQLException e){
                    e.printStackTrace();
                }
            }

            if (ps != null){
                try{
                    ps.close();
                }catch(SQLException e){
                    e.printStackTrace();
                }
            }

            if (conn != null){
                try{
                    conn.close();
                }catch(SQLException e){
                    e.printStackTrace();
                }
            }
        }

    }
}