What are the steps for configuring one-to-many mapping …

The steps for configuring a one-to-many mapping in MyBatis are as follows:

1. Create two entity classes, each representing one side of the one-to-many relationship.
2. Create a Mapper interface and define the query method.
3. Configure the mapping relationship of query results in the Mapper interface using the @Result annotation or in the corresponding XML file using tags.
4. In the corresponding XML file, configure a one-to-many relationship using tags to represent the “many” side and tags to represent the “one” side.
5. In the corresponding XML file, write a query statement using JOIN to link the one-to-many relationships, and use GROUP BY to group the results.
6. Define the parameters and return type for the query method in the corresponding Mapper interface.
7. Configure the scanning path for Mapper interfaces and related configurations for MyBatis in the project’s configuration file.
8. In the code, obtain an instance of the Mapper interface by using the getMapper method of SqlSession, and then call the query method to perform a query.
9. Retrieve the query results, encapsulate them into entity classes using the associated mapping relationships, and obtain a one-to-many result.

The above are the main steps for configuring one-to-many mapping in MyBatis. Adjustments can be made according to actual needs, such as configuring and coding appropriately for inserting or updating one-to-many operations.