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
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
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
There are two ways to implement connection queries for ElasticSerch
parent and child Association queries
Storage Structurenested is stored in the same type as other fields and in an arrayIn type, the format is as follows:
"mobile": "133010202 ...
Posted on Sun, 28 Jul 2019 09:43:52 -0700 by limitphp
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
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
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
[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:
Use checkBox to bind ...
Posted on Wed, 24 Jul 2019 04:21:27 -0700 by ziah75
1.camera provider process introduction:
cameraserver 736 1 274664 69564 binder_thread_read f3de10cc S firstname.lastname@example.org
The pid is 736, which indicates that the camera provider process started earlier, and the permission group is cameraserver.
Mobile phone running email@example.com Pr ...
Posted on Tue, 23 Jul 2019 09:59:49 -0700 by lisa007
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