repository query spring boot

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import java.util.List;

public interface YourEntityRepository extends JpaRepository<YourEntity, Long> {

    @Query("SELECT e FROM YourEntity e WHERE e.someField = ?1")
    List<YourEntity> findBySomeField(String someFieldValue);

}

1. Import necessary Spring Data JPA repository interfaces.

2. Define an interface that extends JpaRepository, specifying the entity type (YourEntity) and the primary key type (Long).

3. Declare a custom query method by using the @Query annotation. In this example, a method named findBySomeField is created to retrieve entities based on a specific field value.

4. Customize the query using JPQL (Java Persistence Query Language) within the @Query annotation. Replace YourEntity with the actual name of your entity class and adjust the field name and parameter accordingly.

5. Specify the method parameters in the query using ?1, ?2, etc. These parameters will be replaced with actual values when the method is invoked.

6. The method returns a List of entities satisfying the query condition.

Note: Ensure that you replace "YourEntity" with the actual name of your entity class, and customize the query based on your entity's fields and requirements.