Howard Lee Cloud

學習 Laravel 5.5 Eloquent relation whereHas and whereRaw usage

By Howard Lee 13 June 2018

Version: Laravel 5.5 Model: Post, Comment Post’s columns: id, title, content, created_at, updated_at Comment’s columns: id, post_id, content, c_date, c_time, u_date, u_time Relation: A post has many comments and a comment belongs to a post. The following shows how to get posts, which had been comments in recent 24 hours. use CarbonCarbon; // use package Post::whereHas('comments', function ($query) { $query->whereRaw('(u_date = ? AND u_time >= ?) OR (u_date =? AND

生活 2018年做了哪些事情

By Howard Lee 07 June 2018

看過長榮航空 2016 和 2017 年財務年報看過 udemy android app 開發課 https://www.udemy.com/master-android-7-nougat-java-app-development-step-by-step/ database 資料庫相關章節的第 166~248 節 . 20180630 補充：已經看完第 249-263 節. 基礎課程的 introduction , downloading and setup, helloworld app, button-counter app. 看完 Youtuber hvass 機器學習

心得調整閱讀文件的順序

By Howard Lee 27 May 2018

日前在選備份 postgres 資料庫的方案選項時，認為應該先看過內建功能的備份和 HA 功能，再考慮要用內建或是外部套件進行，所以細讀一遍 postgres 10.3 的第 26 章和 31 章。預期

軟體工程 Postgres WAL 概述

By Howard Lee 10 May 2018

PostgreSQL version 10 WAL 設定概述參數： checkpoint_timeout default is 5 minute max_wal_size default is 1GB archive_timeout full_page_writes checkpoint_warning checkpoint_completion_target default is 0.5 and only be fraction of checkpoint_timeout pg_test_fsync can measure average speed in microsecond of single WAL flush operation. Half of its value is effective for reporting average time setting that it flush single 8KB write operation to commit_delay. pg_test_fsync doesn’t care whether fsync

軟體工程 Deploy problems when upgrading to rails 5.2.0 from 4.2.5

By Howard Lee 28 April 2018

Capistrano 部署 production 環境從 Rails 4.2.5.1 升級到 Rails 5.2.0 的環境時遭遇了兩個問題 Cannot find gem bundler >= 0.a Solution for your production environment: reinstall rvm and bundler gem rvm implode rvm get head rvm reload rvm reset rvm use 2.4.1 rvm gemset create rails5.2.0 rvm use [email protected] --default gem install bundler which bundle modify config/deploy.rb content and

軟體工程採用新技術的考量方式

By Howard Lee 12 April 2018

團隊成員若建議使用新技術，我建議團隊主管一定要請這個團隊成員，除了自己以外，還要訓練好最少兩個人。若其他產品團隊會使用到新技術開發的功能，建

About

Category

Tag

Social