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Adding a new column to a core MySQL order table with tens of millions of rows can lock the table and disrupt services, so this article explores safe alternatives such as master‑slave switching, online schema change tools, extension tables, JSON fields, and clever reuse of existing redundant columns.
This comprehensive guide explains the purpose, configuration attributes, and practical usage of Spring MVC request‑mapping annotations, Spring dependency‑injection annotations, scope settings, and conditional annotations, providing code snippets and visual examples for each feature.
An easy-to-understand walkthrough explains Docker images as static system snapshots, containers as runnable instances, Dockerfile and docker‑compose recipes, and how Kubernetes Pods orchestrate containers, highlighting why these tools enable “run anywhere” deployment and scalable management across clusters.
The article explains how excessive, fake, or chaotic encapsulation creates hidden risks, reduces maintainability, and hampers extensibility, then provides concrete refactoring examples and practical principles to achieve clean, purposeful encapsulation in backend code.
This article explains why pagination only becomes complex when querying across sharded databases, compares three common solutions—including global search, sequential ID‑based paging, and the discouraged secondary query method—provides practical SQL examples, outlines pros and cons, and offers a STAR‑style interview answer.
This guide walks through Maven’s core workflow for Java backend development, covering plugin configuration, automatic project setup in IntelliJ IDEA, detailed pom.xml settings—including properties, dependencies, plugins—and code examples for Servlets and JSPs, plus dependency scope handling to avoid runtime conflicts.
This article explains how to replace manual encryption code with a lightweight, annotation‑driven solution that uses a custom MyBatis interceptor to automatically encrypt and decrypt sensitive fields such as phone numbers, emails, and ID cards, improving code readability, maintainability, and security compliance.
This article explores common pitfalls and nuanced behaviors in Nginx configuration, illustrating how trailing slashes affect proxy_pass routing, detailing location matching priorities, comparing reload commands, guiding offline installation across architectures, and providing comprehensive settings for deploying Unity WebGL WASM applications with proper MIME types and security headers.
Easy Work is a Java workflow engine that offers a simple API and modular components, enabling developers to create, execute, pause, and serialize complex workflows using code, JSON definitions, and rich conditional predicates, with detailed examples covering repeat, sequential, parallel, and conditional flows.
The article analyzes a custom TraceIdGenerator that uses a simple AtomicInteger counter and IP‑based prefix, identifying how its reset logic and CAS competition can cause duplicate IDs in high‑concurrency scenarios, and proposes timestamp checks, larger ranges, retry mechanisms, and true Snowflake implementation as solutions.
