Fix MyBatis Mapper Auto-Injection Issues

If you encounter issues with automatic injection when using the mapper, you can try the following solutions:

1. Ensure that the relevant configuration files for MyBatis, including the MyBatis configuration file (usually mybatis-config.xml) and the database connection configuration file (usually database.properties or application.properties), are properly configured. Make sure the configuration files contain the correct database connection information and Mapper scan paths.
2. Make sure the correct annotations are used when injecting Mapper. Use the @Autowired annotation on the class or interface needing to inject the Mapper, or use @Autowired or @Resource annotations on the property needing to inject the Mapper. Also, ensure that the class or interface has the MyBatis annotation @Mapper.
3. Make sure there is an implementation class or interface for the Mapper in the project. The implementation class or interface usually ends with Mapper and includes method definitions for the SQL statements to be executed. Ensure that the @Mapper annotation from MyBatis is used on this class or interface.
4. Make sure that the Spring framework is being used and that the relevant configuration files are correctly set up (usually applicationContext.xml or applicationContext.xml). These configuration files should include the correct package scan path and Mapper scan path.
5. Ensure that there is a configuration file for Mapper in the project (typically Mapper.xml), and that it has been configured in the MyBatis configuration file. The configuration file should contain the correct Mapper mapping relationships and SQL statements.

If the above methods still cannot solve the problem, it is recommended to check the project’s dependencies, configuration files, and annotation usage for correctness, or refer to relevant documents and example codes for debugging and troubleshooting.