What are the reasons for pagehelper not working?

There are several possible reasons why PageHelper may not be functioning properly.

1. Failure to correctly import the PageHelper dependency: Before using PageHelper, it is necessary to import the relevant dependency, otherwise it will not work properly. This issue can be resolved by adding the necessary dependency in the pom.xml file.
2. Configuration error: Before using PageHelper, the necessary configuration needs to be done. If there are configuration errors, such as not correctly configuring the database type or the pagination plugin not being effective, PageHelper will not work. This issue can be resolved by checking the relevant configuration options in the configuration file.
3. Incorrect code usage: When using PageHelper in the code, there may be errors such as not correctly calling the PageHelper.startPage method or not correctly calling the count method. This issue can be resolved by checking the usage in the code.
4. Some databases do not support pagination, such as earlier versions of MySQL. If you are using a database that does not support pagination, PageHelper will not work properly. You can try upgrading your database version or using another database that supports pagination to solve this issue.
5. Version mismatch: PageHelper has different versions, which may have differences and compatibility issues. If the version of PageHelper being used does not match the versions of other components in the application, it may result in PageHelper not functioning properly. You can try upgrading or downgrading the version of PageHelper to resolve this issue.