The simplest push reminder service - Bark

In a building, a real-time monitoring device was installed. But because the building is still in the state of full construction, so this monitoring equipment, constantly pinched by the construction party, disconnected network and so on, is in a state of great danger. So, I've been wondering if there ...

Posted on Mon, 29 Jul 2019 22:12:53 -0700 by bhogg

Thinking in Java - Interface

9. Interface 9.1 abstract classes and methods Abstract classes: classes containing abstract methods that cannot be instantiated by themselves Abstract method: only declaration, no method body Relationships: abstract methods are sufficient and unnecessary conditions for abstract classes, so abstract classes allow method implementations to coexi ...

Posted on Mon, 29 Jul 2019 03:38:45 -0700 by donbonzo

Phase 13 - Data analysis: the use of Matplotlib

Use of Matplotlib Matplotlib is a Python 2D drawing library. With Matplotlib, developers can generate drawings, histograms, power spectra, bar graphs, error graphs, scatter plots and so on with only a few lines of code. Why Learn Matplotlib It can make the data visualized and more intuitive to u ...

Posted on Mon, 29 Jul 2019 01:20:40 -0700 by ixos

The elasticsearch join query is based on es5.1.1

There are two ways to implement connection queries for ElasticSerch nested parent and child Association queries nested Storage Structurenested is stored in the same type as other fields and in an arrayIn type, the format is as follows: PUT index_test/type_info/1000 { "userId": 1000, "mobile": "133010202 ...

Posted on Sun, 28 Jul 2019 09:43:52 -0700 by limitphp

MYSQL II - Data Management (Foreign Key, Add or Delete)

Mysql: MySQL Data Management Foreign Key Management Foreign key concept If the public key is the primary key in a relationship, then the public key is called the foreign key in another relationship. Thus, foreign keys represent the correlation between the two relationships. A table with another fo ...

Posted on Sat, 27 Jul 2019 00:33:38 -0700 by schajee

Data Analysis Day 7 - Data Visualization

brief introduction When data processing and data analysis are completed, the results of data analysis are obtained, but such a pile of tables can not make it easy to observe and understand the results of data analysis, so finally we need data visualization to clearly present the results of analysis.Da ...

Posted on Fri, 26 Jul 2019 20:39:27 -0700 by osti

Design Patterns-Prototype Patterns

Prototype Pattern: Used to create duplicate objects while ensuring performance. This type of design pattern belongs to the creation pattern, which provides the best way to create objects. This pattern implements a prototype interface for creating clones of current objects. This pattern is used when ...

Posted on Wed, 24 Jul 2019 21:23:54 -0700 by quiksilver

vue encapsulates checkBox list components (custom display options)

I. Preface [Repeated wheels!!! ] vue has many ready-made UI frameworks. The blogger's mobile phone uses mintUI, but the mintUI style can't be changed to what he wants, so he encapsulates a checkBox component himself. Let's start with an effect map: II. Text 1. Explanation Use checkBox to bind ...

Posted on Wed, 24 Jul 2019 04:21:27 -0700 by ziah75

camera provider Start of Android Camera Principle

1.camera provider process introduction: cameraserver 736 1 274664 69564 binder_thread_read f3de10cc S android.hardware.camera.provider@2.4-service   The pid is 736, which indicates that the camera provider process started earlier, and the permission group is cameraserver. Mobile phone running android.hardware.camera.provider@2.4-service Pr ...

Posted on Tue, 23 Jul 2019 09:59:49 -0700 by lisa007

openCamera Module for Android Camera Principles

In the previous article, OpenCamera Module of Android Camera Principles (1), we mainly introduced the calling process of openCamera and the calling relationship between the four levels involved in the camera module, but some details are not explained. In this article, we add some details to enrich the whole openCamera module.Knowledge system. s ...

Posted on Tue, 23 Jul 2019 09:51:41 -0700 by erasam