Tencent Cloud Technology Sharing: MySQL AHI Implementation Analysis

The process of locating user records in MySQL can be described as: opening index - > searching B + tree branch node layer by layer according to index key value - > locating leaf node, locating cursor on rec satisfying condition; if tree height is N, then reading N nodes in index tree and comparing them. If buffer_pool is small, a large nu ...

Posted on Thu, 18 Apr 2019 22:36:33 -0400 by dcj1978

Summary of node express mongoDB personal blog

1 Registration, login and exit 1.1 User Registration and Login Configuration template engine, mongoDB database driver, static file path and post request parsing Middleware Unified data return format for api.js routing // Unified return data format var responseData; // Initialize each request router.use(function (res, req, next) { responseDa ...

Posted on Thu, 18 Apr 2019 17:21:33 -0400 by obsidian

C# Transaction Processing (II) ADO.NET Transaction

Before publishing the System.Transaction name, you can use ADO.NET to create transactions, or you can use components, features, and COM+ (located in System. Enterprise Services) runtime for transaction processing. 1.ADO.NET transaction First, look at the traditional ADO.NET transactions. If you don't create transactions manually, every SQL ...

Posted on Thu, 18 Apr 2019 15:21:33 -0400 by jipacek

HTML5 Local Storage - How to Implement Timed Storage

HTML5 provides two new ways to store data on the client side: localStorage - Data Storage without Time Limits Session Storage - Data storage for a session However, today I'm going to talk about "how to store localStorage on a regular basis". Normally, when localStorage is stored in key-value, it can be used permanently ...

Posted on Thu, 18 Apr 2019 14:39:32 -0400 by roy

Use of mysql cursor cursor, example

Original articles: http://crocodile.iteye.com/blog/1467189 After the acquisition of MySQL by oracle, starting with mysql-5.5, InnoDB as the default storage engine is a major breakthrough. InnoDB, as a storage engine supporting transactions, has related RDBMS features, including ACID transaction support, data integrity (external health), di ...

Posted on Thu, 18 Apr 2019 14:09:33 -0400 by Rupo

day10 Accounting Software

package account; import java.util.Scanner; /** Household Accounting Software Analysis: 1. Record the amount of revenue and expenditure each time. 2. Recording the total amount of revenue and expenditure 3. Recorder's Statement of Income and Expenditure 4. Record each revenue and expenditure container String[] dbs 5. Record e ...

Posted on Thu, 18 Apr 2019 13:27:33 -0400 by Abz

Example of Spring-Data-Mongodb database connection code

Example of Spring-Data-Mongodb database connection code As a qualified programmer, besides considering the functional implementation of requirements, we must also pay attention to the robustness of the program. At the same time, for programmers with operational experience, we should also pay attention to the security of the program. The furio ...

Posted on Thu, 18 Apr 2019 03:15:34 -0400 by satre

Game Planning Tables and Automatically Update to Database

In game development, numerical value is indispensable. The numerical value is usually derived from the planning design, and then developed and applied to the game code. However, the planning requirements are always changing, which leads to the correction of the numerical channel. If you update the code every time to import, it will bring a lot ...

Posted on Wed, 17 Apr 2019 18:51:32 -0400 by itarun

Limitation of Password Encryption and Logon Failures in SpringBoot+Shiro Learning

This project has been written up to now, the basic prototype has come out. Thank you for the children's shoes that have always been concerned about. Send you a chicken soup that you just learned recently: Never forget, there must be a response. Put up another ui picture: ········································································· ...

Posted on Wed, 17 Apr 2019 18:09:34 -0400 by shortkid422

Implementation of ORM Object Relational Mapping with Java Custom Annotations

First, ORM concept ORM is Object Relation Mapping, Object is object, Relation is relational database, Mapping mapping, that is, there is a corresponding relationship between objects in Java and tables in relational database. Now common ORM frameworks, such as Hibernate and mybatis, adopt ORM. The basic principle is the correspondence of clas ...

Posted on Wed, 17 Apr 2019 17:30:33 -0400 by eb1024