Native SQL Execution in Spring Data Repositories

Spring Data JPA provides the ability to execute native SQL queries within a Spring Data Repository using the @Query annotation. Unlike typical @Query annotations, which operate on entities, native SQL queries can directly interact with the underlying database.

To execute native SQL within a repository method, set the nativeQuery attribute of the @Query annotation to true. For instance:

@Query(value = "SELECT * FROM MY_TABLE WHERE id = ?", nativeQuery = true)
List findByNativeSql(Long id);

The above method will execute the native SQL query "SELECT * FROM MY_TABLE WHERE id = ?" and map the results to the Entity class.

Furthermore, Spring Data JPA supports named native queries, which are defined in the persistence.xml file. To use a named native query, simply specify its name in the @Query annotation, as follows:

@Query("findByNativeSqlQuery")
List findByNativeSqlQuery(Long id);

By utilizing the @Query annotation with nativeQuery set to true or by leveraging named native queries, developers can seamlessly integrate raw SQL queries into their Spring Data Repositories, allowing for greater flexibility and fine-grained control over database operations.