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mybatis plus groupby

时间: 2023-10-24 15:33:29 浏览: 218

MyBatis Plus does not directly support the GROUP BY clause as it is an Object Relational Mapping (ORM) framework that focuses on simplifying database operations. However, you can achieve grouping by using custom SQL queries with MyBatis Plus. Here's an example: ```java @Mapper public interface MyMapper extends BaseMapper<MyEntity> { @Select("SELECT column1, column2, COUNT(*) AS count FROM my_table GROUP BY column1, column2") List<Map<String, Object>> getGroupedData(); } ``` In this example, `MyEntity` represents your database table entity, and `MyMapper` is an interface that extends `BaseMapper` provided by MyBatis Plus. The `getGroupedData` method uses a custom SQL query with the GROUP BY clause to retrieve aggregated data. You can call the `getGroupedData` method to retrieve the grouped data from the database. The result will be a list of `Map<String, Object>`, where each map represents a row of aggregated data with keys corresponding to column names and values containing the aggregated data. Remember to configure MyBatis Plus properly in your project and inject the mapper interface into your service or controller for usage.

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