Why should the front end use modularity?

React's main functions include componentized thinking, state management and virtual DOM. 1) The idea of ​​componentization allows splitting the UI into reusable parts to improve code readability and maintainability. 2) State management manages dynamic data through state and props, and changes trigger UI updates. 3) Virtual DOM optimization performance, update the UI through the calculation of the minimum operation of DOM replica in memory.

It is impossible to view MongoDB password directly through Navicat because it is stored as hash values. How to retrieve lost passwords: 1. Reset passwords; 2. Check configuration files (may contain hash values); 3. Check codes (may hardcode passwords).

Recovering deleted rows directly from the database is usually impossible unless there is a backup or transaction rollback mechanism. Key point: Transaction rollback: Execute ROLLBACK before the transaction is committed to recover data. Backup: Regular backup of the database can be used to quickly restore data. Database snapshot: You can create a read-only copy of the database and restore the data after the data is deleted accidentally. Use DELETE statement with caution: Check the conditions carefully to avoid accidentally deleting data. Use the WHERE clause: explicitly specify the data to be deleted. Use the test environment: Test before performing a DELETE operation.

The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting

Do you want to know how to display child categories on the parent category archive page? When you customize a classification archive page, you may need to do this to make it more useful to your visitors. In this article, we will show you how to easily display child categories on the parent category archive page. Why do subcategories appear on parent category archive page? By displaying all child categories on the parent category archive page, you can make them less generic and more useful to visitors. For example, if you run a WordPress blog about books and have a taxonomy called "Theme", you can add sub-taxonomy such as "novel", "non-fiction" so that your readers can

Summary: Navicat cannot view SQLite passwords because: SQLite does not have traditional password fields. SQLite's security relies on file system permission control. If the file password is forgotten, it cannot be retrieved (unless the database is encrypted, the key is required).

CentOS will be shut down in 2024 because its upstream distribution, RHEL 8, has been shut down. This shutdown will affect the CentOS 8 system, preventing it from continuing to receive updates. Users should plan for migration, and recommended options include CentOS Stream, AlmaLinux, and Rocky Linux to keep the system safe and stable.

The core of Oracle SQL statements is SELECT, INSERT, UPDATE and DELETE, as well as the flexible application of various clauses. It is crucial to understand the execution mechanism behind the statement, such as index optimization. Advanced usages include subqueries, connection queries, analysis functions, and PL/SQL. Common errors include syntax errors, performance issues, and data consistency issues. Performance optimization best practices involve using appropriate indexes, avoiding SELECT *, optimizing WHERE clauses, and using bound variables. Mastering Oracle SQL requires practice, including code writing, debugging, thinking and understanding the underlying mechanisms.