IDEA操作jdbc总结

今天学习IDEA操作JDBC，MySQL包导入到项目

// 1、注册数据库的驱动
//        Driver driver=new com.mysql.jdbc.Driver();
//        DriverManager.registerDriver(driver);
        String driver = "com.mysql.jdbc.Driver";
        Class.forName(driver);//java基础反射

        // 2.获取数据库连接

        String url = "jdbc:mysql://localhost:3306/fresh";
        Connection connection = DriverManager.getConnection(url, "root", "");

        //3.获取操作数据库的对象
        Statement statement = connection.createStatement();
        String sql = "select * from user";
        ResultSet resultSet = statement.executeQuery(sql);

        //4.遍历结果集，取出数据
        while (resultSet.next()){
           String name =  resultSet.getString("name");
            System.out.print("名字："+name);
        }
        connection.close();

//更新数据
String sql = "UPDATE user set name='小萌' where id=1";
int resule = statement.executeUpdate(sql);

System.out.println(resule);

statement.close();
connection.close();

Junit单元测试  
项目=》新建test目录 ，project structure=>选中test文件点击sources如此即可在test文件夹下创建java文件