PostgreSQL Securities Industry Database Requirement Analysis and Application

Label PostgreSQL, Securities, Time Series Data, JSON, HSTORE, Array, range Index, BRIN Block Index, Time Sharing Trend, Linear Regression, MADlib, Machine Learning background The securities industry produces more data, reading and writing is very frequent. Take stock trading for example, there are thousands of shares in total.There are abou ...

Posted on Mon, 08 Jul 2019 09:15:14 -0700 by WolfRage

Modern c++ development tool folly tutorials series: dynamic _____________

I. Preface People who have used dynamic typed languages such as python and php are certainly familiar with dynamic data types. It is very convenient to use dynamic types for data types that are uncertain in definition and determined only at runtime. C + + is a static typed language, so is it impossible to enjoy the benefits of "dynamic&qu ...

Posted on Sun, 07 Jul 2019 20:03:44 -0700 by nickmgombash

[Front End] H5 Page to check whether app is installed or not

Recently, companies need to optimize the sharing process, one of which is that front-end H5 detects whether the application is installed to make different judgments (download or jump directly to app). The principle is simple: create an iframe to open uri. If you open the app successfully and enter the background, the switch back time will excee ...

Posted on Sun, 07 Jul 2019 18:55:46 -0700 by Cerebral Cow

1 second crack js packer encryption (turn)

From: http://www.cnblogs.com/52cik/p/js-unpacker.html   Actually, it's a bit of a headline party, but that's probably what it means. Get to the point. eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e ...

Posted on Sun, 07 Jul 2019 17:34:21 -0700 by phprocky

Shocked, you may not know the new features of Swift 3.1

Apple recently released Xcode 8.3 and a small version of Swift 3.1. But don't worry, Swift 3.1 and Swift 3 are compatible, which won't cause too much trouble for your Swift 3 project. Unfortunately, Xcode 8.3 ruthlessly removes support for Swift 2.3, so if your project is using pre-3.0 versions, I recommend that you don't rush to update it. fai ...

Posted on Sun, 07 Jul 2019 17:17:56 -0700 by AngelG107

IMWeb Training Camp Operations - todo list

IMWeb Training Camp Operations - todo list Don't talk too much nonsense, put on the effect map first. Students who want the source code can download it at the following address Links: http://pan.baidu.com/s/1sl8nqJb Password: gdvd Now let me talk about the feeling of doing this. 1. First of all, this is a demo to be improved, such as cl ...

Posted on Sun, 07 Jul 2019 13:48:20 -0700 by Helaman

What js can easily be ignored (1)

JavaScript functions start with their own function definition when looking for variables, and look from "inside" to "outside". So the top of the scope starts at the "inside" part. 1 / 3 === (1 - 2 / 3); // false Computers cannot accurately represent infinite cyclic decimals, so there are errors. isNaN(NaN); / ...

Posted on Sat, 06 Jul 2019 12:44:25 -0700 by blue-genie

Update prompt for Android build project - pop-up update prompt box

Get version number# id: Hump Naming: Control Type Location of Control Logical Content Represented by Control /** * Get the version number of the current application * @return */ private String getVersionName(){ //Package manager, get all the information in the manifest file PackageManager pm = getPackageManager(); ...

Posted on Fri, 05 Jul 2019 15:40:30 -0700 by Gighalen

Gson Guidelines for Use (1)

Note: This series is based on Gson 2.4. Gson is confident enough to click off. The main contents of this article are as follows: Basic usage of Gson Use of @SerializedName annotation for attribute renaming Using generics in Gson I. Basic Usage of Gson Gson provides two methods, fromJson() and toJson(), which are directly used fo ...

Posted on Fri, 05 Jul 2019 10:41:41 -0700 by betportal

JavaScript for Learning Notes of Qiwu Academy

How to Write Native JavaScript Basic points of attention JavaScript is responsible for behavior and state change, not for style change. js: Dynamic scripting language. CSS is responsible for style <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Attend to each one's own duties&lt ...

Posted on Thu, 04 Jul 2019 16:01:01 -0700 by twinedev