It happened to be Double Eleven some time ago. Usually before and after Double Eleven, there will be a small climax of part-time orders for Python. During this period, the demand for reptiles and data classification in various industries will increase dramatically! Many friends in the circle are busy during weekends, and many of them […]
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ADO interface _RecordsetPtr pointer
Original reference: ADO interface_RecordsetPtr-CSDN blog _RecordsetPtr smart pointer, which is a pointer specially set up for operating the database through the recordset. Through this interface, various operations can be performed on the records, fields, etc. in the database table. To be clear: the database and the ADO record set are two different concepts, two storage […]
Linux SSH password-free login
Table of Contents Introduction Create Linux users and user groups Configure LINUX static IP Edit IP mapping SSH password-free login configuration Login test Introduction SSH (Secure shell) is a protocol that can provide secure communication in applications. Network data can be transmitted securely through SSH. Its main principle is to use an asymmetric encryption system […]
[javaScript Core] High-order functions
Foreword “In JavaScript, functions are first-class citizens.” We can always see this sentence in various books and articles. The popular explanation is: functions in JS are also objects. They can have attributes, can be assigned to a variable, can be placed in an array as elements, and can be used as attributes of other objects. […]
Echart polar coordinates, azimuth and distance diagram, icon symbol rotation and size, color gradient
Background: Participating in an interactive chart project, the customer had a need for polar coordinate comparison to display different types of indicator data in different directions and distances. Specifically, the attribute fields are: Source, distance, orientation, ID, rotation angle, size Let’s look at the renderings first: Technical points: Legend description: The distance is the radial […]
jsp+servlet online ordering system (front desk, backend) based on javaweb+mysql (java+jsp+servlet+mysql+dbutil+tomcat)
jsp + servlet online ordering system (front desk, backend) based on javaweb + mysql (java + jsp + servlet + mysql + dbutil + tomcat) Private message Source code acquisition and debugging communication Operating environment Java≥8, MySQL≥5.7, Tomcat≥8 development tools eclipse/idea/myeclipse/sts, etc. can be configured to run Be applicable Course design, major assignments, graduation projects, […]
Java SE packages, packages, static keywords and code blocks
1. Encapsulation 1.1 Concept of encapsulation There are three major characteristics of object-oriented programs: encapsulation, inheritance, and polymorphism. In the class and object stage, the main research is on encapsulation characteristics. What is encapsulation? simply put It’s the shell shielding details. Encapsulation: organically combine data and methods of operating data, hide the properties and implementation […]
[JUC] 1. synchronized keyword and Lock interface
Article directory 1. JUC 2. Processes and threads 3. Concurrency and parallelism 4. User thread and daemon thread 5. Object locks and class locks 6. Synchronized keyword 7. synchronized case 8. Lock interface 1.JUC JUC, the java.util.concurrent toolkit for processing threads, started with JDK1.5, and has three packages: Basic package Atomic package Lock bag 2. […]
A brief discussion on CoordinatorLayout
Directory Article directory Table of contents 1.What is CoordinatorLayout 2. Features of CoordinatorLayout 3. Usage of CoordinatorLayout 4.CoordinatorLayout related attribute methods Properties of CoordinatorLayout Behavior method Methods of CoordinatorLayout 4.Usage of CoordinatorLayout In Android development, we often need to deal with complex interface interactions and coordination operations. CoordinatorLayout is a useful layout container from the […]
Two ways to convert Java word to html
The key points are highlighted. . . Method 1: Use the toolkit poi provided by apache. poi uses version 4.1.2 Disadvantages: Inaccurate processing of font styles; inaccurate conversion of wmf formula image parts, this document only supports doc format Advantages: The conversion speed is relatively fast and local debugging is convenient Method 2: Use libreoffice, […]