Level 1: Addition, subtraction, multiplication and division of large integers Task description The task of this level: Master the basic idea of large integers, and use the basic operations of large integers to calculate the factorial of a conventional integer n, and then count the number of digits 0 in the large integer n!. Related […]
Tag: action
Using JTA to implement transaction management of multiple data sources in Spring Boot
Anyone who understands affairs knows that most problems can be solved by transaction management alone in our daily development, but why do we need to bring up JTA? What is JTA? What problem is he specifically here to solve? JTA JTA (Java Transaction API) is an API used to manage distributed transactions on the Java […]
odoo16 front-end framework source code reading – startup, menu, action
odoo16 front-end framework source code reading – startup, menu, action Directory: addons/web/static/src 1.main.js Odoo is actually a single-page application. Judging from the name, this is the entry file for the front end, and the file content is also very simple. /** @odoo-module **/ import {<!– –> startWebClient } from “./start”; import {<!– –> WebClient } […]
Handling simple transactions in Spring Boot
Speaking of transactions, our first impact should be an important concept of database management systems. Transaction is a concept in a database management system (DBMS) that is used to manage a set of operations on the database. These operations are either all executed successfully or all are rolled back (undone). A transaction usually consists of […]
Interaction between MySQL database and python code
Article directory 1. Prepare data Create database Insert data 2. Review of SQL statements Strengthening of SQL statements Create the “Product Classification” table Synchronize table data 3. Steps to operate MySQL in Python Import module Connection object Cursor object 4. Python’s addition, deletion, modification and query operations on MySQL 5. Parameterization 1. Prepare data The […]
Vuex: Helper functions: mapState, mapMutations, mapActions, mapGetters: VOA mode
Description Vuex provides four commonly used auxiliary functions: the purpose is to map the corresponding data and functions in state(), mutaions{}, actions{}, getters{} in vuex, so that we can be more flexible in the component. Simply use these data and functions mapState mapMutations mapActions mapGetters Usage cases /src/store/index.jsState Manager import axios, { Axios } from […]
OSG interaction: select the scene model and highlight it
1. Purpose You can select the specified model entity in the osg view and highlight it. There are two types, one is mouse click selection and the other is frame selection. 2. Mouse click 2.1 Function Description Generate two groups of objects, one group of cow objects can be selected, and the other group of […]
Interaction between WebRTC and IP camera
WebRTC Media Gateways for media interoperability For integrating IP cameras into WebRTC applications, media interaction needs to be implemented first. This means that the media stream provided by the camera needs to be compatible with the WebRTC codec and the format supported by the browser. This also means translating what the IP camera spits out […]
High-precision subtraction (implemented in C language)
High-precision subtraction (implemented in C language) Introduction As we all know, integers are stored in three different sizes of data in C and C++: int, long, and long long. The maximum data size can be Up to 2^64, but in actual use, we will inevitably encounter extremely large number operations that explode long long. At […]
C# inheritance, abstraction, interface, generic constraints, extension methods
Article directory Preface Simulation requirements Scenario simulation Highly repetitive needs Initial class structure Inheritance optimization abstract class Requirement 1: Print CreateTime Method 1: Use overloading Method 2: Base class function Method 3: Generic constraints Method 3.1: Ordinary generic methods Method 3.2: Advanced generic constraints, extension methods Summarize Extra: Generic methods and interfaces Generic constraint abstract […]