MyBatis Mapper Files Explained

The MyBatis mapper file is used to define SQL statements and mapping relationships. In the mapper file, developers can write SQL statements, dynamically generate SQL statements through MyBatis’s dynamic SQL feature, and map the results to Java objects.

Mapper files typically contain the following information:

1. SQL commands include database operations such as querying, updating, inserting, and deleting.
2. Parameter mapping: mapping the properties of Java objects to the parameters in SQL statements.
3. Result Mapping: Mapping the query results to Java objects.

Developers can use mapper files to map Java objects to database tables, encapsulate and decouple database operations, and improve code maintainability and readability in the data access layer.