https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repository-query-keywords

2023
https://www.baeldung.com/spring-data-jpa-modifying-annotation
    @Modifying
2022
https://www.baeldung.com/spring-data-derived-queries
https://www.baeldung.com/spring-jpa-like-queries
2020
https://medium.com/@hashanlahiru6/all-about-query-methods-in-spring-data-jpa-52d74e5d2be7
    DonHash - Query Methods - Spring Data JPA - Learn All About Query Methods in 30 minutes 0:00 of 28:13
    https://www.youtube.com/watch?v=1EOunDOvJVA
    https://github.com/lahiruhashan/JPAQueryMethods
    https://github.com/lahiruhashan/JPAQueryMethods/blob/master/pom.xml
        spring-boot-starter-jpa
        spring-boot-devtools
        spring-boot-starter-test
    https://github.com/lahiruhashan/JPAQueryMethods/blob/master/src/main/resources/application.properties
        spring.jpa.hibernate.ddl-auto=update
        spring.datasource.url=jdbc:mysql://localhost:3306/query-methods
        spring.datasource.username=root
        spring.datasource.password=root
    https://github.com/lahiruhashan/JPAQueryMethods/blob/master/src/main/java/hashtips/querymethods/services/UserService.java
        @Service
        public class UserService {
            @Autowired
            private UserRepository repository; 
            ....
        }
    https://github.com/lahiruhashan/JPAQueryMethods/blob/master/src/main/java/hashtips/querymethods/repos/UserRepository.java
        @Repository
        public interface UserRepository extends CrudRepository<User, Long> {
            List<User> findByFirstName(String firstName); // get , query, read, stream
            List<User> findByFirstNameAndLastName(String firstName, String lastName);
            List<User> findByFirstNameOrLastName(String firstName, String lastName); 
            ...
        }
    https://github.com/lahiruhashan/JPAQueryMethods/blob/master/src/main/java/hashtips/querymethods/domains/User.java
        ublic class User {
            @Id
            @GeneratedValue(strategy = GenerationType.IDENTITY)
            private Long userId;
            private String username, email, firstName, lastName;
            private LocalDate dob;
            private Integer age;
            private Boolean active;
            @Embedded
            private Address address;