Massive Extreme Speed Multidimensional Retrieval of Time, Space and Objects-Best Practice of RDS PostgreSQL in Aliyun

Label PostgreSQL, Time, Space, Object Attributes, Multidimensional Retrieval, Massive, Spatial Index, Data Partition, Block Index BRIN, Multilevel Index, GIN Inverted Index, JSON Index, Multilevel Index, Multilevel Index, Multi-Index Scan Merge, Bitmap And Bitmap Or, Physical Scan, ctid Scan, Interect, Index, Partition Index, Partition Index ...

Posted on Tue, 11 Jun 2019 11:00:20 -0700 by Joseph Witchard

Get information about apps (packages) in Android --------------- Use one of PackageManager

How to get information about applications in Android system, mainly including package name, label, icon, occupancy size, etc.It is divided into two parts: 1: Get the packagename,label,icon, etc. of the application; 2: Get the size used by the application, including: cache size, data size. Launcher will be developed with more usage, and the ...

Posted on Tue, 11 Jun 2019 09:27:50 -0700 by latinofever

Android Cache - LruCache

In the development of Android, caching is more or less involved. For example, loading network pictures, not every time to show a network picture, must be downloaded from the network, in this case, not only waste user traffic, but also may cause bad experience. Generally, the image is loaded into the local storage first, and the next time you n ...

Posted on Mon, 10 Jun 2019 15:33:49 -0700 by aquarius

Summary Note 1 of typescript

I. Data Types 1. boolean Boolean values can only be true or false let isSave: boolean = true 2. Character type let name: string = 'Zhang San'; 3. Digital Types let num1: number = 20; let num2: number = 12.3 4. Array types have two representations let ary1: number[] = [1,2,3]; let ary2: Array<number> = [1,2,3]; 5. Tuple rep ...

Posted on Mon, 10 Jun 2019 11:21:48 -0700 by stricks1984

lucene's learning experience

Preface Learning material is version 4.10 of lucene, which is rather old. Look up the latest official documents of version 6.6 of lucene, and sort out the following differences in use. The order from shallow to deep is (Note: not according to version) 1. The Construction Method of IndexWriter Config 2. Directory generation method FSDirecto ...

Posted on Sun, 09 Jun 2019 19:15:55 -0700 by MarineX69

Deeply and Simply Understanding React High-order Components

Blog address: http://www.luckyjing.com/post... background knowledge Before we begin to talk about higher-order components, let's review the definition of higher-order functions: a class of functions that receive functions as inputs or output another function, called higher-order functions. For higher-order components, it describes components th ...

Posted on Sun, 09 Jun 2019 18:20:47 -0700 by binit

Event Distribution Mechanism-ScrollView Nested ListView Problem Generation Principle and Common Solutions

The previous article explained the mechanism of event distribution, and then continued to learn the mechanism of event distribution in a practical scenario. Scenario 2: ScrollView nests ListView, which can only display one item. Analysis: Since it's a high-level problem, first open ScrollView to see the onMeasure() method: @Override p ...

Posted on Sun, 09 Jun 2019 17:20:31 -0700 by Zan

H5 Video Play Solution

Two days ago, Yang Yang Yang H5 launched by the delegation was a hot circle of friends. There are mainly multi-video playback, pause.It sounds simple, but due to Tencent's white list restrictions, in Weichat browser and qq browser, the video without Tencent domain name in the video tag will be automatically full-screen, and video recommendation ...

Posted on Sun, 09 Jun 2019 17:08:47 -0700 by gchouchou

Summary Note 2 of Typeescript

I. Understanding of Generics Generics can be simply understood as type variables, which are special variables and are used only to represent types rather than values. 2. Define a simple generic 1. Defining generics function identity<T>(arg: T): T { return arg; } identity is called generic function 2. Call this func ...

Posted on Sun, 09 Jun 2019 16:17:10 -0700 by amit.patel

JavaScript Data Structure (3): One-way Link List and Two-way Link List

Translator: Crazy Technology HouseEnglish: https://code.tutsplus.com/art...Description: This article is translated from a series of articles, Data Structures With JavaScript, totaling four. The original author is Cho S. Kim, an engineer working in Silicon Valley, USA. This is the third article in this series. The two most common data structures ...

Posted on Sun, 09 Jun 2019 16:10:35 -0700 by Aureole