Article Introduction：Redis provides commands for clearing cached data, including: deleting a single key: DEL, UNLINK clearing the entire database: FLUSHDB, FLUSHALL

2024-04-19 comment 0  1221

Article Introduction：The PHP file cache class extracted from the CI community's stblog and CI's file_helper class is a simple file-based key->value cache class. This class can be used to cache some basic information, such as some infrequent changes in the header, footer, and sidebar of the blog, and the content taken out from the database. Before fetching the data, first determine whether the content in the file cache has expired. If it has not expired, take it out. , if it expires, connect to the database to query, rewrite the results into the file cache, and update the expiration time.

2018-05-26 comment 0  2125

Article Introduction：How to clear the cache in MySQL requires specific code examples. Caching is one of the important performance optimization technologies in the MySQL database. MySQL uses cache to store frequently queried data and query results to improve the reading speed of the database. However, in some cases, query results may be inaccurate or outdated due to the presence of cache. To solve this problem, we can manually clear the MySQL cache. MySQL's cache is generally divided into two types: query cache and InnoDB cache. The following describes how to clear

2024-02-19 comment 0  803

Article Introduction：Why is the cache deleted instead of updated? If it is an update, there is a distributed transaction problem, the cache may be modified, and the database modification may fail. If you just delete the cache, even if the database modification fails, the next query will directly fetch the data from the database, and no dirty data will appear. What is delayed double deletion? That is, when adding, deleting or modifying an entity class, the cache of the entity class must be cleared. The clearing position is before and after the database operation method. Using the method of proof by contradiction, only deleting the conclusion first and then deleting it later leads to the conclusion that both deletion before and after deletion are problematic. Therefore, the strategy of delayed double deletion is adopted. Thinking 2: Why is delay still a proof by contradiction? The situation in the figure below shows the situation where the old cache still exists after double deletion. The delay is to ensure that the change cache operations of other transactions have been completed before modifying the database -> clearing the cache.

2023-05-26 comment 0  3169

Article Introduction：The class library itself contains many classes that have state dependencies. Such as FutureTask, BlockingQueue, etc. Some operations in these classes are based on state preconditions. For example, you cannot delete elements from an empty queue or obtain the calculation result of an unfinished task. Between these two operations...

2018-07-19 comment 0  2636

Article Introduction：Laravel is a popular PHP framework that provides convenient caching features to speed up applications. Sometimes we need to change the cache value, this article will introduce how to change the cache value in Laravel. 1. Understand Laravel cache In Laravel, we use the Cache class to operate the cache. Laravel supports a variety of cache drivers, including file cache, database cache, Redis cache, etc. We can use get, put, in provided by the Cache class

2023-04-12 comment 0  758

Article Introduction：Detailed explanation of MyBatis caching mechanism: One article to understand the principle of cache storage Introduction When using MyBatis for database access, caching is a very important mechanism, which can effectively reduce access to the database and improve system performance. This article will introduce the caching mechanism of MyBatis in detail, including cache classification, storage principles and specific code examples. 1. Cache classification MyBatis cache is mainly divided into two types: first-level cache and second-level cache. The first-level cache is a SqlSession-level cache. When

2024-02-23 comment 0  1031

Article Introduction：Laravel is a popular PHP framework that is widely used for web development. It provides many convenient functions such as routing, database operations, view templates, etc. Caching and automatic loading are two very important concepts when using Laravel. This article will detail how to clear cache and use autoloading in Laravel. 1. Clear the cache The cache in Laravel can help us improve the performance of the website and reduce the server load. The Laravel framework cache includes view templates, routing, database queries, and more

2023-04-14 comment 0  1628

Article Introduction：Recently, some users reported that they encountered the problem of being unable to log in when using the Gitee website. Gitee is a code hosting platform, similar to GitHub, which provides Git warehouse, code management, version control, project collaboration and other functions. If you cannot log in to Gitee, it will affect the normal user experience, so this problem needs to be solved as soon as possible. First, users can try clearing browser cache and cookies. Sometimes, expired cookies can cause login issues. After clearing cache and cookies, visit Gitee again.

2023-05-17 comment 0  1747

Article Introduction：Java uses the subList() function of the List class to intercept a sublist of a list. During the programming process of Java, we often encounter situations where we need to intercept a sublist of a list. In order to meet this need, Java's List class provides the subList() function, which can quickly intercept a part of the original list and return a new sublist. This article introduces the method of intercepting sublists using the subList() function of the List class, and provides some code examples. When using subL of List class

2023-07-25 comment 0  1453

Article Introduction：As one of the most popular short video social platforms in the world, Douyin provides users with personalized content through recommendation algorithms. Sometimes users may want to reset their preferences to get different types of recommended content. So, how to reset personal preferences on TikTok? In addition, users can also adjust the content they are interested in by changing the recommendation type. 1. How to reset personal preferences on TikTok? Clear cache: Users can try to clear Douyin’s cache data to help Douyin clear old preference data and possibly re-adjust recommended content. In the phone settings, find the cache clearing option of the Douyin application and click Clear Cache. This can help Douyin clear old preference data and possibly re-adjust recommended content. Log in again: Users can try to log out of the anti-yin account and then log in again.

2024-03-28 comment 0  1866

Article Introduction：Getting Started with Guava Caching Made Easy: Introduction to Optimizing Your Code Performance In software development, caching is a common technique that stores frequently used data in memory for quick access. This improves program performance by avoiding the need to read data from a database or other storage medium each time. Guava is a popular Java library that provides many useful tools and classes, including caching classes. Guava cache is a high-performance, thread-safe cache implementation that can help you easily cache data

2024-02-01 comment 0  1003

Article Introduction：Getting started with PHP crawlers: How to choose the right class library? With the rapid development of the Internet, a large amount of data is scattered across various websites. In order to obtain this data, we often need to use crawlers to extract information from web pages. As a commonly used web development language, PHP also has many class libraries suitable for crawlers to choose from. However, there are some key factors to consider when choosing a library that suits your project needs. Functional richness: Different crawler libraries provide different functions. Some libraries can only be used for simple web scraping, while others

2023-08-09 comment 0  1306

Article Introduction：__autoload implements automatic loading; however, due to the introduction of multiple class libraries, __autoload maintenance will be complicated, so spl_aotoload is introduced. spl implements manual registration and removal of an autoloading function list. Let's take a look at the specific content.

2018-09-07 comment 0  7853

Article Introduction：Solution to the problem that the DreamWeaver cms user group is not displayed: 1. Confirm the user group settings and check whether each created user group is correctly configured. Make sure that each user group has a unique name and corresponding permission settings; 2. Clear the cache, click "System" or similar options, and find the "Cache Management" or "Clear Cache" option; 3. Check the template file; 4. Check the permission settings; 5. Update or reinstall DreamWeaver CMS.

2023-08-08 comment 0  1474

Article Introduction：vb connects to sql database: vb connects to sql database and uses DBSQL class to speed up the development of MySQL database programs: When you are writing database programs to access MYSQL, do you find it very troublesome: a large set of functions and parameters, and you also need to check the calls As a result, what is even more troublesome is that each program must contain the database name, user, password, etc., which is not easy to modify. But if you use the DBSQL class in PHPLIB, these problems will be easily solved. This article will teach you how to use DBSQL classes. 1. Obtain DBSQL. How to obtain DBSQL? There are two ways: - Since DBSQL is part of PHPLIB, you can get it from this site or http:/

2016-07-29 comment 0  1322

Article Introduction：When we use PHP to develop a CMS system, cache processing is essential. Cache processing is helpful to the execution efficiency of the program. The PHP cache class can be used to detect whether the file is within the set update time and clear the cache. file, generate a cache file name and create a directory based on the current dynamic file. Cache file output and other functions~

2017-08-15 comment 0  2410

Article Introduction：1. Basics of Java file operations In Java, file operations are a basic and important function. You can use the File class and related methods in the Java class library to create, read, write, and delete files. The File class provides a rich API that can meet most file operation needs. Create a file Filefile=newFile("sample.txt");file.createNewFile();Write a fileFileWriterwriter=newFileWriter(file);writer.write("Hello,World!");writer.close();Read a file Fi

2024-02-27 comment 0  1254

Article Introduction：Entity types in Memcached cannot be cached in Memcached without being serialized, so the entity classes need to be processed before they can be cached. Memcached is a high-performance distributed memory object caching system used in dynamic web applications to reduce database load. It improves the speed of dynamic, database-driven websites by caching data and objects in memory to reduce the number of database reads. Memcached is based on a hashmap that stores key/value pairs. Its daemon is written in C, but the client

2017-06-23 comment 0  2113

Article Introduction：IO should be the most commonly used function in daily projects. Whether it is simple file reading or server port monitoring, IO will be used; however, when faced with the complex IO basic class library in the Java IO package, IO is often used. It’s a big question. Should I choose InputStream or Reader? Should I add a Buffer to InputStream? How to choose the appropriate class library according to the application scenario is a problem faced by many coders. Here I have sorted out the commonly used class libraries in the Java IO package, including their organizational structure, functional features, applicable scenarios, etc., to Convenient for subsequent use, you can quickly and easily select the most appropriate IO class according to your needs.

2017-09-26 comment 0  2316