Course Introduction：MySQL read replica is a read-only instance created through the master-slave replication mechanism, which is used to share the pressure of master library query. The settings steps include: configuring the main library to enable binlog and create a copy account; configuring the slave library to set server-id and start the copy process; verifying the status and monitoring delays and errors regularly. The application layer can utilize read replicas through manual shunt, connection pooling, middleware proxy, or DNS polling. When using it, you need to pay attention to data consistency, connection limit, index optimization and lack of monitoring.
2025-07-18 comment 0 636
Course Introduction：This tutorial discusses in detail the blocking problem that the read method may cause when using the lepiaf\\SerialPort library for serial communication in PHP. By analyzing the internal implementation of the library, we found that even in non-blocking mode, the read method still waits for the delimiter infinitely. The article provides a solution to modify the library source code to introduce a timeout mechanism and guides how to handle serial port read timeout gracefully at the application layer to ensure system stability.
2025-08-23 comment 0 490
Course Introduction：Redis accelerates existing applications: cache queries to reduce server load Core points: Redis effectively accelerates existing applications by caching query results, thereby reducing server stress. It stores query results for a specified time (for example, 24 hours), and then reuses these results, significantly improving application speed. The installation of Redis can be done through the operating system package manager or manually. The installation process includes avoiding common warnings and ensuring that Redis starts automatically after the server restarts. The Predis library works with Redis to provide a memory cache layer for applications. This process involves checking whether the results of the current query exist in the cache, if not, get the result and transfer it
2025-02-17 comment 0 445
Course Introduction：This article explores how to efficiently retrieve associated data through SQL multi-table joins and combines external APIs such as Google Distance Matrix API to solve complex business logic that is difficult to directly handle within a database, such as geographic distance-based filtering. The tutorial details the application of SQL INNER JOIN and FIND_IN_SET functions, as well as the strategy of integrating external services in the application layer (PHP) for subsequent data processing, aiming to help developers build more flexible and powerful data query solutions.
2025-08-16 comment 0 544
Course Introduction：This article details how to use SQL's INNER JOIN statement to jointly query multiple tables to realize the job filtering function based on transaction type and geographical distance. By combining the FIND_IN_SET function to process multi-valued fields and demonstrate how to calculate and filter distances at the PHP application layer by calling external geocoding APIs such as Google Distance Matrix APIs, to build an efficient and fully functional job matching system. The article also provides critical code examples and performance optimization suggestions to help developers build complex business query logic.
2025-08-16 comment 0 863
Course Elementary 13889
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82443
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13237
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24695
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27540
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
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