DQL language learning

Alias the field during query (if there are special symbols in the alias, it is recommended to enclose the alias in double quotation marks / single quotation marks) select Column name 1 as Alias 1, Column name 2 as Alias 2 from Table name; select Column name 1 Alias 1, Column name 2 Alias 2 from Table name; ...

Posted on Fri, 26 Nov 2021 22:16:23 -0500 by midgar777

The adjacency table is used to represent AOV network and judge whether it is a directed acyclic graph

1. Note: the idea in this code comes from s1mba. Worship the great God! 2. This code creates an adjacency table based on the adjacency matrix. The convenience of this is that in the adjacency matrix, we can intuitively show whether the two vertices are connected, and distinguish whether they are digraphs by whether they are symmetric matrices ...

Posted on Fri, 26 Nov 2021 22:09:05 -0500 by fekaduw

Matplotlib data visualization

Task04 This study refers to Datawhale open source learning: https://github.com/datawhalechina/fantastic-matplotlib The content is generally derived from the original text and adjusted in combination with their own learning ideas. Personal summary: first, Matplotlib mainly has two ways to create text: pyplot API and objective oriented API. 2. Te ...

Posted on Fri, 26 Nov 2021 22:46:14 -0500 by harnacks

Go Web framework Gin source code structure analysis

You can read this article before you read it Last article , have an understanding of the core components of the Web framework.Directory structure of source codeTaking v1.7.4 as an example, the source directory structure of Gin is shown in the figure below+---.github | ISSUE_TEMPLATE.md | PULL_REQUEST_TEMPLATE.md | +---binding ...

Posted on Fri, 26 Nov 2021 23:04:27 -0500 by Mystis

C#:C#Call WebService

Reference web address: https://www.cnblogs.com/dotnet261010/p/12461930.html 1. Preface In your daily work, when it comes to interface docking with third parties, some use the WebService approach. This article focuses on how to invoke WebService in the.NET Framework. First, we create a WebService with two methods: one without parameters and one ...

Posted on Fri, 26 Nov 2021 22:55:42 -0500 by DoctorWho

[embedded] STM32 OLED screen display based on SPI communication protocol

1, SPI protocol and OLED introduction 1. Introduction to SPI protocol SPI(Serial peripheral interface), that is, serial peripheral interface, is a communication protocol based on high-speed full duplex bus, which was first defined by Motorola on its MC68HCxx Series MCU. (high speed, full duplex, really powerful) is widely used between ADC ...

Posted on Fri, 26 Nov 2021 23:12:59 -0500 by osram