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数据结构与本地数据库 06：把卡片迁移到 SQLite · App Inventor 2 中文网
...E TABLE IF NOT EXISTS meta(k TEXT PRIMARY KEY, v TEXT)", list())
if 建表 and 元数据 {
var 版本 = SQLite1.SelectSQL("SELECT v FROM meta WHERE k = ?", list("migration"))
if length(版本) = 0 {
SQLite1.BeginTransaction()
var 成功 = true
foreach 项 in 卡片 {
var 写入 = SQLite1.Execute("IN...
Rails CSRF Protection + Angular.js: protect_from_forgery makes me to log out on POST
..._forgery option is mentioned in application_controller, then I can log in and perform any GET requests, but on very first POST request Rails resets the session, which logs me out.
...
MongoDB: Combine data from multiple collections into one..how?
...you can use as an _id.
For example, let's say you have a users collection and a comments collection and you want to have a new collection that has some user demographic info for each comment.
Let's say the users collection has the following fields:
_id
firstName
lastName
country
gender
age
And...
Stripping out non-numeric characters in string
... fractions, subscripts, superscripts, Roman numerals, currency numerators, and encircled numbers. This method contrasts with the IsDigit method, which determines whether a Char is a radix-10 digit." msdn.microsoft.com/en-us/library/yk2b3t2y.aspx
– LukeH
Oct 20 ...
Getting ssh to execute a command in the background on target machine
...w do you use ssh in a shell script? question. If I want to execute a command on the remote machine that runs in the background on that machine, how do I get the ssh command to return? When I try to just include the ampersand (&) at the end of the command it just hangs. The exact form of the comm...
String formatting: % vs. .format vs. string literal
... slightly different syntax from the existing % operator. Which is better and for what situations?
16 Answers
...
Algorithm to implement a word cloud like Wordle
...re's how Wordle actually works:
Count the words, throw away boring words, and sort by the count, descending. Keep the top N words for some N. Assign each word a font size proportional to its count. Generate a Java2D Shape for each word, using the Java2D API.
Each word "wants" to be somewhere, such...
Using jQuery to see if a div has a child with a certain class
... postfix: "",
imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9....
How Can I Set the Default Value of a Timestamp Column to the Current Timestamp with Laravel Migratio
...r/Migrations. I have gone through the Laravel documentation several times, and I don't see how I can make that the default for a timestamp column.
...
Set custom HTML5 required field validation message
...sign a function, it can accept a reference to the input element (DOM node) and it must return a string which is then displayed as the error message.
Compatibility
Tested in:
Chrome Canary 47.0.2
IE 11
Microsoft Edge (using the up-to-date version as of 28/08/2015)
Firefox 40.0.3
Opera 31.0
Ol...