jdbc 02: 连接mysql，并实现删除与更新

jdbc连接mysql，并实现删除与更新

package com.examples.jdbc.o2_删除与更新;

import java.sql.*;
//连接与插入
/*
    jdbc删除操作
 */
public class Test {
    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        try {
            //1. 注册驱动
            Driver driver = new com.mysql.jdbc.Driver();
            DriverManager.registerDriver(driver);

            //2. 获取数据库连接对象
            String url = "jdbc:mysql://ip:3306/数据库名";
            String userName = "XXXX";
            String passWord = "XXXX";
            connection = DriverManager.getConnection(url, userName, passWord);

            //3. 获取数据库操作对象
            statement = connection.createStatement();

            //4. 执行sql语句
            //String sql = "delete from student where id=4";
            String sql = "update student set sname = '郭郭' where sname = '小涵'";
            int num = statement.executeUpdate(sql);
            //System.out.println(num == 0? "删除失败" : "删除成功");
            System.out.println(num == 0? "修改失败" : "修改成功");

            //5. 查询结果集
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            //6. 关闭资源
            if(statement != null){
                try {
                    statement.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if(connection != null){
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}