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This tutorial aims to solve the problem of repetition of @ExceptionHandler method in Spring application. By abstracting multiple similar exception handling logic into a general private auxiliary method, effective refactoring of the code is achieved, thereby improving the readability and maintainability of the code, and following the DRY (Don't Repeat Yourself) principle to reduce redundant code.
Aug 05, 2025 pm 03:18 PM
This article explains in detail the configuration of multiple JPA data sources in Spring Boot applications and solves the problem of native SQL query errors pointing to the primary data source. By configuring a unique persistence unit name for each data source and ensuring that the EntityManager correctly references the corresponding persistence unit, it can effectively avoid native query confusion and achieve accurate operations on different databases.
Aug 05, 2025 pm 03:15 PM
This article details how to configure and manage multiple JPA data sources in Spring Boot applications, focusing specifically on how to solve the "table does not exist" problem that you may encounter when using native SQL queries. By introducing PersistenceUnitName, it is clear that EntityManager is bound to a specific data source, and combined with @EnableJpaRepositories and @Transactional annotations, it ensures the correctness and isolation of entity management and transaction operations on different data sources.
Aug 05, 2025 pm 03:12 PM
This article describes how to access and use client objects in different module files in the Discord.js project. Typically, there is no need to explicitly pass the client to each file, as it can be retrieved from the callback function. This article will explain in detail how to get client objects from event callbacks, and how to pass client objects through parameters if necessary, and provide sample code and considerations.
Aug 05, 2025 pm 03:09 PM
This article aims to guide developers how to simplify multiple exception handling methods with similar method bodies into one general method by extracting common logic. In this way, code redundancy can be significantly reduced, maintainability and readability of the code can be improved, and DRY (Don't Repeat Yourself) principle can be followed.
Aug 05, 2025 pm 03:06 PM
This article aims to explore how to correctly and efficiently access Discord.js Client objects in different module files (especially event processing files) when developing Discord robots in the Node.js environment. We will introduce two main methods: directly obtaining the Client instance through event callback parameters, and explicitly passing the Client instance through event listeners. The article will elaborate on the implementation details, applicable scenarios and precautions of each method to help developers build a Discord robot application with clear structure and easy to maintain.
Aug 05, 2025 pm 03:03 PM
This tutorial explores in-depth discussions on the common coordinate system origin definition problem in solvePnP function when using OpenCV for ArUco code pose estimation. The article points out that incorrect markerPoints settings can lead to pose visualization bias and provides a solution to accurately center the origin of the ArUco code coordinate system at the mark. By adjusting the object point definition, ensure that the pose estimation results are consistent with the visual presentation, thereby achieving accurate 3D pose analysis and application.
Aug 05, 2025 pm 03:00 PM
This tutorial details how to efficiently extract specific advanced custom field (ACF) values from all articles with custom PHP functions in WordPress and organize them into an alphabetical index list, while providing links to the original article for each entry. This method uses WP_Query for data retrieval, and combines PHP array functions for sorting and formatting output, which is suitable for building custom content directories or keyword indexes.
Aug 05, 2025 pm 02:57 PM
This article details how to programmatically use WordPress’ WP_Query and Advanced Custom Fields (ACF) plug-ins to extract the values of the specified ACF fields (such as "keywords") from the site-wide article. The tutorial will guide you how to collect links to these keywords and their corresponding articles and sort them alphabetically, and ultimately generate a clearly structured and clickable keyword index list, greatly improving the discoverability of website content and user navigation experience.
Aug 05, 2025 pm 02:54 PM
In Discord.js application development, when the project structure is split into multiple files, developers often face the problem of how to access Discord client instances in different event processing files. This article will introduce two main methods in detail: one is to obtain the client object through event callback parameters, and the other is to optionally explicitly pass the client instance when event registration. Through code examples and considerations, help developers understand and choose the method that best suits their project needs, ensuring the correct and efficient use of client instances.
Aug 05, 2025 pm 02:51 PM
This tutorial is intended to guide developers how to simplify the repeated exception handling methods in Spring Boot applications by extracting public logic. By abstracting similar code blocks into a reusable private helper method, code redundancy can be significantly reduced, code readability and maintainability can be improved, and the exception handling logic can be made clearer and more efficient.
Aug 05, 2025 pm 02:48 PM
This tutorial discusses in detail the pointing error issues that native queries may encounter when configuring multiple JPA data sources in Spring Boot applications. When two primary and secondary PostgreSQL databases are configured and JPA native SQL queries are executed on the secondary database, the system may incorrectly route the query to the primary database. The core solution is to use the unitName attribute annotated by @PersistenceContext, combine the setPersistenceUnitName method of LocalContainerEntityManagerFactoryBean to clearly specify the association of EntityManager and a specific persistence unit.
Aug 05, 2025 pm 02:45 PM
In Discord.js robot development, accessing the main client instance from event processing files (such as guildMemberAdd.js) is a common requirement when a project is split into multiple files. This article will introduce two main methods: one is to use the client attributes that come with the event callback parameters, which is a recommended and more concise way; the other is to explicitly pass the client instance through the event listener and discuss its potential precautions to help developers build a modular Discord robot with clear structure and complete functions.
Aug 05, 2025 pm 02:42 PM
This article will introduce in detail how to programmatically obtain the values of specific ACF fields (such as keywords) in all articles and organize them into an alphabetical list, each keyword comes with a link to the article it belongs to, thereby creating a dynamic article keyword index. This method uses WP_Query to query articles, collects ACF field values and article links, and sorts and outputs them through PHP array functions.
Aug 05, 2025 pm 02:39 PM
This tutorial details how to use the opensearch-py library to overcome the limit of 10,000 results in a single query through OpenSearch's Scroll API, thereby efficiently getting all matching query results. The article will provide specific Python code examples to guide users how to initialize the client, build queries, initiate rolling queries, and iterate over and process a large amount of data, and ultimately implement full data export or analysis.
Aug 05, 2025 pm 02:36 PM
This article discusses how to efficiently manage a PHP file so that it can be used as an API interface for front-end AJAX requests and as an internal library function for back-end PHP scripts. The core solution is to use the conditional judgment mechanism to distinguish HTTP requests from internal references, thereby avoiding unnecessary code execution and ensuring the flexibility and correctness of the script. The article will provide specific code examples and discuss related best practices.
Aug 05, 2025 pm 02:33 PM
This article aims to explain how to use componentization ideas to efficiently modify the attribute values of SVG elements and add new nodes in Next.js or React applications. The article will explore the advantages of using SVG as a direct rendering of React components in depth, and provide specific code examples covering dynamic adjustments of text content, color, position, and on-demand addition of new graphic elements, thereby circumventing the complexity and limitations of traditional DOM operations.
Aug 05, 2025 pm 02:30 PM
This tutorial details how to efficiently retrieve over 10,000 query results using the OpenSearch Scroll API using the opensearch-py library. The article first explains the limitations of the standard search API, and then explains in-depth how the Scroll API works, including its context management and iterative mechanism. Through specific Python code examples, we demonstrate how to initialize the client, initiate the first search request with scroll parameters, and how to loop the client.scroll() to continuously obtain all matching documents and export them to a CSV file.
Aug 05, 2025 pm 02:27 PM
This article introduces in detail the efficient methods of dynamically modifying SVG attribute values and adding new nodes in Next.js applications. The core strategy is to convert SVG into reusable React components, use the component's props and state to flexibly control the text, style and location of SVG elements, and implement conditional rendering or loop generation of new nodes, thereby avoiding the complexity of direct DOM operations and improving development efficiency and maintenance.
Aug 05, 2025 pm 02:24 PM
This article details how to use the Scroll API of the opensearch-py client to overcome the limitation of OpenSearch's default 10,000 results, so as to efficiently retrieve all documents that match the query criteria. The article will elaborate on how the Scroll API works and provide Python code examples to guide users on how to initialize the client, build queries, initiate initial scrolling requests, and how to obtain and process a complete query result set through loop iteration to ensure that all relevant information can be obtained when processing large-scale data.
Aug 05, 2025 pm 02:21 PM
This article discusses in detail how to optimize PHP API assistive scripts so that they can efficiently serve front-end AJAX requests and back-end PHP internal calls at the same time. By introducing conditional execution logic, API processing is separated from function definitions to ensure that scripts behave consistently in different calling scenarios without side effects. The tutorial covers PHP file structure design, jQuery AJAX front-end call methods, and the back-end PHP's strategy of reusing code through include, aiming to improve the maintainability and reusability of the code.
Aug 05, 2025 pm 02:18 PM
This article explores in-depth efficient ways to dynamically modify SVG properties and add new nodes in Next.js or React applications. By directly defining the SVG structure as a React component, we can flexibly control the text, style, location and dynamic addition and deletion nodes of the elements inside the SVG, thereby achieving highly customizable and interactive SVG content, avoiding the complexity of traditional DOM operations and seamlessly integrating with React's declarative paradigm.
Aug 05, 2025 pm 02:15 PM
In Python, object instances usually do not store their variable names directly. This article explores an advanced technique to identify and obtain the variable name corresponding to the object instance by dynamically checking variable references in the current scope (global or local). The article elaborates on its implementation principles and code examples in detail, and focuses on analyzing the limitations of this method, performance considerations, and applicable scenarios and alternatives in actual development. It aims to help developers understand the nature of Python object references and make informed design choices.
Aug 05, 2025 pm 02:12 PM
This article will explore in-depth how to optimize PHP files so that they can serve as both an API interface for front-end AJAX requests and a function library that can be safely referenced by back-end PHP scripts. We will analyze common problems, such as accidental execution of complete logic when a file is included, and provide various strategies such as conditional judgment, modular design, and consistent parameter management to ensure the clearness, efficiency and maintainability of the code, while taking into account the different needs of front-end and back-end calls.
Aug 05, 2025 pm 02:09 PM
This article explores how to optimize complex if conditional statements in Java, and significantly improve the readability and maintenance of the code by analyzing redundant logic and adopting if-else if structure. The article shows how to simplify conditional judgment with specific code examples and provides general principles for writing clear and efficient conditional logic, aiming to help developers avoid common pitfalls and write more robust code.
Aug 05, 2025 am 08:33 AM
This article explores in-depth how to automatically generate solveable puzzles for the Double-Choco puzzle game. We will introduce an efficient data structure - a cell object based on a 2D grid that contains boundary information, color, and state. On this basis, we will elaborate on a recursive block recognition algorithm (similar to depth-first search) and how to integrate it into the iterative puzzle generation process to ensure that the generated puzzles meet the rules of the game and are solveable. The article will provide sample code and discuss key considerations and optimization strategies in the generation process.
Aug 05, 2025 am 08:30 AM
This article aims to solve the problem that when calculating the intersection of two arrays in Java, the first position of the new array appears unexpectedly "0". The core reason is the inaccurate calculation of the array size and the error in placing the index of elements in the new array. The article will analyze the problem code in depth and provide two corrections: one is to use fixed-size arrays and correctly manage the index, the other is to adopt a more flexible ArrayList, and ultimately provide debugging techniques and best practice suggestions to help developers avoid such common mistakes.
Aug 05, 2025 am 08:27 AM
This tutorial aims to explain in detail how to use Flexbox to achieve vertical/horizontal layout switching of the parent container, and dynamically adjust the arrangement of its internal child elements in combination with JavaScript. By introducing additional wrapper layers and JavaScript logic, we can flexibly switch text input boxes between a single column vertical stack and a multi-row horizontal arrangement according to the main layout direction, enabling more granular and responsive interface control.
Aug 05, 2025 am 08:24 AM
This article aims to explore how to efficiently create a series of object instances based on an array of strings in JavaScript. We will introduce two main strategies: storing instances in an array, or in an object with the original string as the key. By using methods such as for...of loops and Array.prototype.map, you can avoid manually creating a large number of instances, and automate and modularize the code, while avoiding the bad practice of creating global variables.
Aug 05, 2025 am 08:21 AM
This article aims to resolve the Cannot find name 'styled'.ts(2304) error encountered in TypeScript projects. This error is usually caused by not importing the styled object correctly when using CSS-in-JS libraries such as Emotion or Styled Components. The tutorial will provide detailed instructions on how to eliminate this compilation error by adding necessary import statements to ensure the normal use of style components, thereby improving development efficiency and code maintainability.
Aug 05, 2025 am 08:18 AM
