Programmer Group

Preface: After dealing with the problem of internal leakage in the framework, see the previous part: Sagit.Framework Solution: IOS Memory Leakage Caused by Bidirectional Reference (C) - IOS Unknown Bug It was found that there was a place in the business code where memory was not released for a very simple reason: self is used in block s, c ...

Vue+Django REST framework Set up a website of fresh supermarket with front and back ends separated Django rtf completes mobile phone registration and user login (2) user serializer and validator validation (registration function) The registration page requires us to enter the phone number verification number and password. django ...

We used many chapters earlier to discuss how to move data from the background database to memory and then perform line-by-line operations. The solution we chose was to convert background data into data streams in memory. Whether it is opening database tables or reading data from the database, it involves the safe use of database tables as a res ...

Recently, Crash on APP has been started to correspond, and many common problems have been found. The same problem appears in many APPs. Here are some common errors. crash Log: org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: com.google.gson.stream.MalformedJsonException: Unterminated string at line 1 ...

Realization of Explosion EffectWhen an airplane is hit by an artillery shell, it needs an explosive effect to make our picture more exciting. Explosive effects are also common in game development.We define the Exlode class to represent the information of the explosion. The difference between the explosion class and the ordinary class is that it ...

1. Egg language example do(define(x, 10), if(>(x, 5), print("large"), print("small")))Equivalent to js code: x = 10; if(x>5) print("large"); else print("small"); 1. Parser Read a piece of code and convert it into a data structure, which can accurately reflect the program structure of the code. Everything i ...

Blog address: http://blog.csdn.net/FoxDave SharePoint sites, lists, and list items all belong to the SecurableObject type. By default, a secure object inherits the privileges of its parent. To set custom permissions for an object, you need to break its inheritance from the parent and customize permissions by adding or deleting role assignments. ...

Preface This article is an advanced article in the MultiItem series. It focuses on the usage and implementation of header footer and drop-down refresh loading for more functions. MultiItem Usage and Detailed-Elegant Implementation of Multi-Type RecyclerView Adapter Some basic usages and dependencies are explained. Students who haven't seen them ...

Case classification Case has two formats: 1. Simple Case function and 2.Case search function. Simple Case function: CASE sex WHEN '1' THEN 'male' WHEN '2' THEN 'female' ELSE 'Other' END Case search function CASE WHEN sex = '1' THEN 'male' WHEN sex = '2' THEN 'female' ELSE 'Other' END The same function can be achieved ...

[Title link] http://acm.hdu.edu.cn/showproblem.php?pid=6020 [title] Give you a number with length n, and then let you delete k numbers. Ask if you have a deletion plan so that the remaining N-K numbers are multiples of three. [Abstract] Here we enumerate the last N-K number, which is the highest number. In this way, we can directly det ...