Django restframework user authority authentication component addition and source code analysis

Source code analysis of user authorization verification is similar to user login verification, but in order to increase memory, it is necessary to add again, Note: be sure to follow the blogger's comments to see the Chinese comments of the code and the following line of code!!! 1. Prepare a routing and view class. The global routing configurati ...

Posted on Mon, 01 Jun 2020 05:53:49 -0400 by if

Spring Data Rest encounters a composite primary key

If the project persistence layer uses Spring Data JPA and some data tables contain composite primary keys (Union primary keys), how can the interface generated by Spring Data Rest access the data corresponding to a primary key in these data tables? Suppose the database has two data tables film with compound primary key ...

Posted on Sun, 31 May 2020 06:05:01 -0400 by rathlon

Openlayers 6 aggregation diagram (download with source code)

preface I wrote a map aggregation map article in openlayers 4 before, but because it is written by encapsulating a layer of js code, many beginners seem to be a bit laborious, so this article rewrites a map thermal map article, directly based on the latest version of openlayers 6, in the form of pure html + js + css, without any encapsulati ...

Posted on Sun, 31 May 2020 00:33:30 -0400 by mattr

Installation and verification of JWT Auth in laravel (example)

Installation and verification of JWT Auth in laravel   1. Use composer to install jwt, cmd to the project folder; Composer require tymon / JWT auth 1.0. * (here the version number is written according to your own needs) Install jwt, refer to official documentation https://jwt-auth.readthedocs.io/en/docs/laravel-installation/ 2. If the laravel v ...

Posted on Thu, 28 May 2020 08:48:45 -0400 by bacarudaguy

You robbed so many red envelopes. Do you know how it works?

With the popularity of electronic payment, red envelopes are very popular in social software such as wechat nails. Generally, the amount of red envelopes does not need to be very large, which can achieve the way to improve everyone's enthusiasm. In fact, robbing red envelopes is more of a pastime. It's a joy that can't be imagined. As our tra ...

Posted on Mon, 25 May 2020 23:16:21 -0400 by wee_eric

C++98/11/17 Expression Categories

target Can the following code be compiled and passed, and run as expected?(Click to expand)#include <utility> #include <type_traits> namespace cpp98 { struct A { }; A func() { return A(); } int main() { int i = 1; i = 2; // 3 = 4; const int j = 5; // j = 6; i = j; func() = A(); return 0; } } name ...

Posted on Sat, 23 May 2020 12:44:44 -0400 by luzlin

Summary of Ultra-Detailed Production-Level Load Balancing Algorithms

Detailed production-level load balancing algorithm Introduction to load balancing Load Balance, the English name for Load Balance, refers to a collection of servers that are symmetrically composed of multiple servers, each of which has an equivalent status and can be served independently without the assistance of other servers.With a load-sh ...

Posted on Mon, 18 May 2020 12:36:53 -0400 by launchcode

FP growth algorithm finds frequent itemsets -- building FP Tree

There are two common algorithms for mining frequent itemsets, one is Apriori algorithm The other is FP growth. Apriori mining frequent item sets by constantly constructing candidate sets and filtering candidate sets needs to scan the original data many times. When the original data is large, the disk I/O times are too many and the efficiency is ...

Posted on Mon, 18 May 2020 02:30:54 -0400 by wilbur

I finally found an article titled "ServiceManager Relationships at the Java and Native tiers"

Relationship between Java Layer ServiceManager and Native Layer ServiceManager. From Here .Thank you for writing such articles for reference.However, I can't remember what others said. One day, one day, I will rewrite it myself:) Initialization of Java-tier Binder Ultimately, Binder has to deal with its drivers. What the Java la ...

Posted on Wed, 13 May 2020 12:39:49 -0400 by toniknik1982

Don't look for it. Answer the life cycle of Bean in Spring. Here's a summary for you

The life cycle of Bean in ApplicationContext Here's a picture:   You must have been blinded to see this picture. Don't worry, I'll explain it slowly: from getBean( )To trigger points, the Spring container's Bean life cycle has gone through the life cycle in the figure, which is divided into two classes: The three steps of the green arrow and ...

Posted on Tue, 12 May 2020 05:48:07 -0400 by widox