Article directory 1. Unary operator overloading 1. List of unary operators 2. Implement operator overloading operations for the following classes 3. Use global functions to implement prefix + + auto-increment operator overloading 4. Use global functions to implement prefix – – overloading of the decrement operator 2. Complete code example 1. Unary operator overloading 1. […]
Tag: increment
[C++] Operator overloading ⑤ (Unary operator overloading | use member functions to implement prefix ++ auto-increment operator overloading | use member functions to implement prefix – – auto-decrement operator overloading)
Article directory 1. Unary operator overloading 1. Use member functions to implement prefix + + auto-increment operator overloading 2. Use member functions to implement prefix – – overloading of the decrement operator 2. Complete code example 1. Unary operator overloading 1. Use member functions to implement prefix + + auto-increment operator overloading Use global functions […]
The difference between MySQL 8 and MySQL 5.7 in auto-increment counting
The difference between MySQL 8 and MySQL 5.7 in auto-increment counting Author: Arunjith Aravindan Source of this article: Percona blog, translated by the Axon open source community. This article is approximately 900 words long and should take 2 minutes to read. Auto-Increment The Auto-Increment counting function can generate unique values for the primary key column, […]
Android implementation of App incremental update code implementation.
1. Incremental update implementation ideas 1) The server generates a patch differential package: It is worth noting that different differential packages need to be generated for different versions installed by users, in order to upgrade all versions installed by users to the latest version. 2) The client requests a differential package: When the client makes […]
TI’s incremental PID algorithm
/* ============================================= ==================================== File name: PID_GRANDO.H ================================================== =================================*/ #ifndef __PID_H__ #define __PID_H__ typedef struct {<!– –> _iq Ref; // Input: reference setting value _iq Fbk; //Input: feedback value _iq Out; // Output: controller output _iq c1; // Internal: differential filter coefficient 1 _iq c2; // Internal: differential filter coefficient 2 } PID_TERMINALS; // Note: Placing […]
Motor control miscellaneous notes 2_incremental PID and positional PID
Directory: 1. Preface The PID principle was briefly mentioned in the previous article “Miscellaneous Notes on Motor Control – A Brief Talk on FOC”. Let’s break it down: P represents the proportion of deviation, I is the integral, and D is the differential. The combination of the three It is called a PID automatic controller, […]
MySQL constraints (primary key-auto-increment-default value)
Table of contents 1: MySQL constraints 1. What are constraints? Two: unsigned (remove positive and negative signs) Three: zerofill (not enough digits to fill with zero) Four: not null (not empty) 1. Use constraints (if not added, an error will be reported) Five: default (default value) Six: unique (unique data) 1. Single column is unique […]
[Mysql database backup] Based on XtraBackup, full and incremental backup and restore of Mysql database
Article directory summary Install XtraBackup Create Mysql backup user Directory structure description: Environment variable script (backup_env.sh) Full backup script: `xtrabackup_full.sh` Incremental backup script: `xtrabackup_incremental.sh` Data restoration script: `xtrabackup_restore.sh` Configure scheduled tasks Summary Database backup is one of the key steps to ensure data security and availability. Percona XtraBackup is an open source tool for high-performance […]
mybatis/mp batch inserts non-auto-incrementing primary key data
Article directory Preface 1. The batch insertion of mp is fake 2. Real batch insertion 1.Use sql injector to process 2. Use self-coding to write xml for batch execution The generated content is as follows: Three questions Problem Description problem causes problem solved Paste a copy, compatible collection Replace original file Summarize The difference between […]
Mybatis automatically increments the id after inserting data and obtains it
Requirements We need to return the ID after inserting data (generated by the database’s auto-incremented primary key) for our next operation. like this /** * Get the id after testing the insertion */ @Test public void testinsertStudentCacheId(){<!– –> Student student=new Student(“helloworld”,17,85); System.out.println(“Before inserting: student=” + student); dao.insertStudentCacheId(student); System.out.println(“After insertion: student id=” + student.getId()); } Learn […]