import tk.mybatis.mapper.common.Mapper;

As an AI language model, I don't have the ability to provide an explanation of the code snippet you provided. However, I can tell you that `tk.mybatis.mapper.common.Mapper` is a Java interface that provides common database operations for MyBatis-based applications. It defines methods for CRUD (create, read, update, delete) operations, as well as other database-related operations. The interface is typically implemented by MyBatis mappers, which are Java classes that map database tables to Java objects.