What causes the MyBatis-Plus query results to be inconsistent?
Apr 19, 2025 pm 06:57 PM
Analysis of the problem of inconsistent query results caused by MyBatis-Plus cache
This article analyzes a problem of inconsistency in the previous and subsequent search results of MyBatis-Plus. Problem phenomenon: After last value of the database field is updated, the first query reads the new value, but the second query reads the old value, and then the latest value is read again.
The log displays key information:
- First query (17:49:09.423):
lastvalue is 22, then updated to 23, and read immediately tolast = 23. - Second query (17:50:00.010):
lastvalue falls back to 22 abnormally. - The third query (17:50:00.012):
lastvalue correctly reads the latest value 1048.
This phenomenon is likely caused by MyBatis-Plus' caching mechanism. MyBatis-Plus uses Level 1 cache (SqlSession level) and Level 2 cache (Mapper level) by default.
If a secondary cache is used and the cache invalidation strategy is inappropriate, the second query may read the old data from the cache rather than the latest data in the database after updating the data. This explains why the second query result is last = 22 even if last value has been updated multiple times and reaches 1048. After that, the cache is invalid or cleared, and the latest data is read only after the third query.
The database transaction isolation level can also cause problems, but the log shows that the two query intervals indicate that the first transaction has been committed, so the probability of this factor is less.
Solution:
It is recommended to check the MyBatis-Plus cache configuration and consider the following scenarios:
- Turn off Level 2 cache: This is the most direct solution, which can effectively avoid data inconsistencies caused by cache.
- Adjust cache failure strategy: If you need to retain the secondary cache, you need to adjust the cache failure strategy, such as shortening the cache validity time or using a more appropriate failure strategy.
- Check concurrency issues: Troubleshoot whether there are concurrent access to the database in the code, such as multiple threads updating the same data at the same time.
If the above method still fails to solve the problem, you need to further check the database transaction isolation level settings and other potential issues in the code.
The above is the detailed content of What causes the MyBatis-Plus query results to be inconsistent?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What should I do if the Redis cache of OAuth2Authorization object fails in Spring Boot?
Apr 19, 2025 pm 08:03 PM
In SpringBoot, use Redis to cache OAuth2Authorization object. In SpringBoot application, use SpringSecurityOAuth2AuthorizationServer...
Steps to add and delete fields to MySQL tables
Apr 29, 2025 pm 04:15 PM
In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.
Gitstatus In-depth analysis of viewing repository status
May 22, 2025 pm 10:54 PM
The gitstatus command is used to display the status of the working directory and temporary storage area. 1. It will check the current branch, 2. Compare the working directory and the temporary storage area, 3. Compare the temporary storage area and the last commit, 4. Check untracked files to help developers understand the state of the warehouse and ensure that there are no omissions before committing.
How to parse next-auth generated JWT token in Java and get information in it?
Apr 19, 2025 pm 08:21 PM
In processing next-auth generated JWT...
Detailed steps to deploy a Joomla website on PhpStudy
May 16, 2025 pm 08:00 PM
The steps to deploy a Joomla website on PhpStudy include: 1) Configure PhpStudy, ensure that Apache and MySQL services run and check PHP version compatibility; 2) Download and decompress PhpStudy's website from the official Joomla website, and then complete the installation through the browser according to the installation wizard; 3) Make basic configurations, such as setting the website name and adding content.
How to restore the win8 system details steps
May 07, 2025 pm 05:00 PM
The steps to start system restore in Windows 8 are: 1. Press the Windows key X to open the shortcut menu; 2. Select "Control Panel", enter "System and Security", and click "System"; 3. Select "System Protection", and click "System Restore"; 4. Enter the administrator password and select the restore point. When selecting the appropriate restore point, it is recommended to select the restore point before the problem occurs, or remember a specific date when the system is running well. During the system restore process, if you encounter "The system restore cannot be completed", you can try another restore point or use the "sfc/scannow" command to repair the system files. After restoring, you need to check the system operation status, reinstall or configure the software, and re-back up the data, and create new restore points regularly.
Binance official website latest address directly enter
May 20, 2025 pm 05:36 PM
Visiting the latest address to Binance official website can be obtained through search engine query and follow official social media. 1) Use the search engine to enter "Binance Official Website" or "Binance" and select a link with the official logo; 2) Follow Binance's official Twitter, Telegram and other accounts to view the latest posts to get the latest address.
How to package in IntelliJ IDEA for specific Git versions to avoid including unfinished code?
Apr 19, 2025 pm 08:18 PM
In IntelliJ...
