babel-node template

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1	npm install babel-cli babel-preset-env --save-dev

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{   "presets": [     "env"   ] }

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1	nodemon src/index.js --exec babel-node

Completely uninstall apache2 to get fresh config

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1	apt-get remove --purge apache2 apache2-data apache2-utils

Powershell command to debug ios in chrome

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1	remotedebug_ios_webkit_adapter --port=9000

Open safari, browse to the page that is going to be inspected. Then in chrome go to chrome://inspect/#devices and choose the device.

Copy all lastly updated files into a single directory if the version control is horribly not done by git:

Instantiate a git repository (don't need to connect to any remote branch, do everything locally). Create a .sh file at the current directory, and paste:

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#!/bin/bash   git add . git status   updatedFiles=$(git status | awk '{print $2}' | grep -P "\..*$")   touch updates/update.txt git status > updates/update.txt   for file in $updatedFiles do     cp --parents "$file" ./updates     echo "copied $file to ./updates/$file" done;   read -p "Press enter to exit"

mkdir updates and then run the bash script above. Files will be copied into updates directory, and we can manage it by date.

如果用了 spring-boot-devtools 的話，謹記在開啟 SpringApplication 前:

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public class Main {   public static void main(String[] args) {     System.setProperty("spring.devtools.restart.enabled", "false");     SpringApplication.run(Main.class, args);   } }

不然不知為甚麼它有 restart 機制，restart 前後的同一個 class 將不視為同一個 class，database transaction 將發生錯誤。

Hilbernate Database Configuration without XML

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package com.springboot.mvc;   import java.util.Properties; import com.springboot.mvc.models.Customer; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; import org.hibernate.cfg.Environment; import org.hibernate.service.ServiceRegistry;   public class HibernateUtil {   private static SessionFactory sessionFactory;     public static SessionFactory getSessionFactory() {     if (sessionFactory == null) {       try {         Configuration configuration = new Configuration();         // Hibernate settings equivalent to hibernate.cfg.xml's properties         Properties settings = new Properties();         settings.put(Environment.DRIVER, "com.mysql.cj.jdbc.Driver");         settings.put(Environment.URL,             "jdbc:mysql://192.168.99.100:3306/JDBC_spring_mvc_tutorial?useSSL=false&serverTimezone=UTC");         settings.put(Environment.USER, "cclee");         settings.put(Environment.PASS, "ccleedb12345");         settings.put(Environment.DIALECT, "org.hibernate.dialect.MySQL55Dialect");         settings.put(Environment.SHOW_SQL, "true");         settings.put(Environment.CURRENT_SESSION_CONTEXT_CLASS, "thread");         settings.put(Environment.HBM2DDL_AUTO, "create-drop");           configuration.setProperties(settings);         configuration.addAnnotatedClass(Customer.class);        // we add more and more classes here.                           ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()             .applySettings(configuration.getProperties()).build();         sessionFactory = configuration.buildSessionFactory(serviceRegistry);       } catch (Exception e) {         e.printStackTrace();       }     }     // Then:     // Session session = sessionFactory.openSession();     // Transaction transaction = session.beginTransaction();       return sessionFactory;   } }