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  <=> operator in MySQL

Have you ever seen "<=>" in a SQL query while using MySQL? Does it mean less and equals to and greater than? Actually if you consider it as the union of <= and =>, great, you are close to it. This is one form of equal operator in MySQL, it has the similar meaning to the = operator with some subtle difference. According to MySQL documentation, <=> is NULL-safe equal. This operator performs an equality comparison like the = operator, but returns 1 rather than NULL if both operand...

   MySQL,NULL safe,<=>     2014-03-24 06:23:22

  Understanding Twitter Bootstrap 3

On 27, July, Twitter Bootstrap 3 RC 1 was released, if there are no major bugs found in this release, then it will be the final released Twitter Bootstrap 3 with some minor changes. What changes does Bootstrap 3 have compared to Bootstrap 2? After checking the documents, we can find that there are mainly 3 changes. Embrace flat design In Bootstrap 3, it begins to embrace flat design. First from the official webpage of Bootstrap 3, we can find elements are flat designed. Also, all buttons have no...

   Bootstrap 3,Change,Bootstrap 2     2013-08-05 07:06:22

  Canonicalize XML in Java

XML canonicalization is often used when there is need to create digital signature to be sent to peers for verification. Since digital signature is created based on XML data, the XML data has to be canonicalized before its signature value can be calculated. Even an extra space may affect the signature value calculated, hence it must follow some rules to canonicalize the XML data so that it has a standard format. This is why W3C created specification Canonical XML Version 1.1. This specificat...

   JAVA,XML,JAVA SECURITY     2016-01-20 01:39:45

  Sending message to Slack Incoming Webhook using PHP

Slack is a popular work collaboration tool and it provides many features which help teams collaborate. It has one function which allows sending messages to channels from external source such as your own web service -- Incoming Webhook. This is extremely useful when want to monitor something and get notified when some event occurs and it doesn't require complicated setup. To send messages using Incoming Webhook, a service URL has to be generated on Slack and then the message can be posted to this...

   PHP,CURL,SLACK,INCOMING WEBHOOK     2017-03-11 21:32:28

  An easy way to log client side information to server

JavaScript debug is a very troublesome thing in web application development. Because many web browsers will not notify you if there is any error in the JavaScript codes you write. They just silently fail and block the following codes execution. In order to debug JavaScript codes, we need a good log mechanism which will help us log the error information,, we often need to log errors in JavaScript codes to server for debug purpose in a production web application, What should we do? The first ...

   JavaScript log, Ajax,Image,Debug     2012-12-30 09:16:50

  The use of Erlang in Facebook chat

Erlang  is a general-purpose concurrent, garbage-collected programming language and runtime system. It stays strong while building concurrency programs. Erlang provides language-level features for creating and managing processes with the aim of simplifying concurrent programming. It has large application in many chat service well known now such as Whatsapp and initial version of Facebook chat. Previously we have written an article Use of Erlang in WhatsApp. In this post, we will talk about...

   Facebook,Erlang     2014-02-25 07:12:36

  Measure the improvement of Google search algorithm

On the day of Google's 15th birthday, Google released its new "Hummingbird" search algorithm, this is the first time that Google changes its search algorithm since 2010 after the Caffeine algorithm. It will affect 90% of search results, according to Amit Singhal, Lead of Google Search. Some may be curious about how Google measures the improvement of a new search algorithm. There are many factors need to be considered, for example, accuracy, relevance, search depth etc. According to Amit Singhal...

   Google search,Algorithm, improvement     2013-09-29 23:25:53

  About go get and go install in Go 1.16

Go version 1.16 beta1 has been released on 18 Dec 2020, major features of Go 1.16 have been finalized with this beta release. Many people are discussing about the support of Apple M1, however, this post will not cover this topic. Instead the focus will be on go get and go install changes. There are lots of changes related to modules in Go 1.16, the details can be found in the release note. Below are some of the key highlights. GO111MODULE is on by default, if wanna keep old behavior, needs...

   GOLANG,GO 1.16,GO INSTALL     2020-12-26 00:26:58

  Understanding an interesting JavaScript map function question

With the evolvement of JavaScript, lots of new features have been added this old but robust language.  Among them are lots of functional programming language related functions like map, filter, each etc. In this post, we will cover one function map and its interesting behavior. Before dive into the details, let first take an example, do you know the output of below function call? ['1', '7', '11'].map(parseInt) You may think that it's easy and the output would be [1, 7, 11] Can you try to ru...

   JAVASCRIPT,MAP,FUNCTIONAL PROGRAMMING     2019-06-14 08:34:46

  Dieter Rams' 10 principles of good web design

Dieter Rams is one of the most important designers of the 20th century but his famous 10 principles for good design focused on industrial design. Here Lisbon-based designer Nuno Loureiro applies them to web design “My heart belongs to the details. I actually always found them to be more important than the big picture. Nothing works without details. They are everything, the baseline of quality”  â€“ D...

   Web design,Principle,Innovation     2012-02-08 10:29:32

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