What are the problems with MyBatis caching and how can they be solved?

The cache issues in MyBatis mainly consist of first-level and second-level cache issues. Below are the respective explanations of these two cache problems and their solutions.

1. First level cache issue:
2. In the same SqlSession, if the same data is modified and then queried again, the old value will be retrieved from the cache, leading to inconsistent data. The solution is to manually clear the cache after the modification operation, which can be done using the clearCache() method to clear the first-level cache.
3. When conducting batch insertions, updates, or deletions within the same SqlSession, it will result in cache invalidation, causing subsequent queries to retrieve the latest data from the database. To resolve this, manually clear the cache after batch operations using the clearCache() method to clear the first-level cache.
4. Secondary cache issue:
5. When modifications are made in multiple SqlSessions, it can lead to inconsistencies between the data in the second-level cache and the database. The solution is to manually clear the second-level cache after the modification operation, which can be done using the clearCache() method.
6. Batch operations across multiple SqlSessions can result in inconsistencies between the data in the second-level cache and the database. To resolve this issue, manually clear the second-level cache after batch operations using the clearCache() method.
7. When using caching, it is important to consider the serialization of cached objects. If the cached object does not implement the Serializable interface, it may result in the cache being unable to store or retrieve the object properly. The solution is to implement the Serializable interface in the cached object.

In summary, the main way to solve MyBatis cache issues is to manually clear the cache using the clearCache() method for both first level and second level caching. Additionally, it is important to manually clear the cache after batch operations or modification operations to avoid data inconsistency issues. Furthermore, attention should be paid to the serialization of cache objects.