spring-data

问题 I'm using a Spring Redis repository and I'm puzzled with the delete operation and the phantom key. When a delete is performed, the phantom key is not deleted, is it a normal behaviour ? If yes, is it possible to force a deletion of the phantom key when the original key is deleted from the code. I was expecting that a delete removes the original key AND the associated phantom key. I planned to use to timeToLive feature to ensure that keys not deleted by my application will expire after a while

问题 I am facing weird issue with an application which is a spring boot application. Details Here: The app has a spring batch job which uses JpaItemWriter for performing the writes to the database. Also, the application is configured to use hibernate ItemWriter configuration as follows: @Bean(name = "itemWriter") @StepScope public ItemWriter<Record> itemWriter() { JpaItemWriter<Record> itemWriter = new JpaItemWriter<>(); itemWriter.setEntityManagerFactory(emf); return itemWriter; } The batch job

问题 This is my enum: public enum FooBarType { Foo, Bar; @javax.persistence.Converter public static class Converter implements AttributeConverter<FooBarType, String> { @Override public String convertToDatabaseColumn(FooBarType t) { return t.toString(); } @Override public FooBarType convertToEntityAttribute(String s) { for (FooBarType value : FooBarType.values()) { if (value.name().equalsIgnoreCase(s)) { return value; } } throw new IllegalArgumentException("Invalid value for enum: " + s); } } }

问题 I have what I thought was a straight forward relation in JPA. Looks like this. CompanyGroup: @Entity @Table public class CompanyGroup implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue private Long id; @Column(name = "name") private String name; @JoinColumn(name = "companies") @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL) private List<Company> companies; } Company: @Entity @Table public class Company implements Serializable {

问题 In Spring-data-mongodb, can we return the single deleted object from query method of repository like below public interface MyRepository extends MongoRepository<MyObject, String>{ Optional<MyObject> deleteByXAndY(String x, String y); } if there will be always single document that's get deleted by above query. I tried it but it throws exception like cant convert Long to MyObject. I think only void, long or List or Stream are supported. Is there any way to achieve what I am trying to do? 回答1:

问题 In Spring-data-mongodb, can we return the single deleted object from query method of repository like below public interface MyRepository extends MongoRepository<MyObject, String>{ Optional<MyObject> deleteByXAndY(String x, String y); } if there will be always single document that's get deleted by above query. I tried it but it throws exception like cant convert Long to MyObject. I think only void, long or List or Stream are supported. Is there any way to achieve what I am trying to do? 回答1:

问题 Basically we have a spring boot application that requires that the user can define his/her own set of fields and that these fields should be persisted in their own class/table through JPA/Hibernate at runtime. These classes will be generated dynamically through bytebuddy. All that should be done dynamically without having to restart the application. The Hibernate Dynamic mapping is not an option, since we will be creating new classes entirely and re-map them. I have also considered an EAV

问题 I'm creating DTO versions of all my entities. I have a problem with an entity that has one Enum value. This is my entity: @Getter @Setter @Table(name = "TIPOS_MOVIMIENTO") @Entity public class TipoMovimiento { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; @Column @Convert(converter = TipoMovEnumConverter.class) private TipoMov tipo; public String getTipo() { return tipo.getTipoNombre(); } @OneToMany(mappedBy = "tipoMov") private List<Movimiento> movimientos; No, I

问题 I have a Spring data repository: @Repository interface SomeRepository extends CrudRepository<Entity, Long> { Stream<Entity> streamBySmth(String userId); } I am calling that method in some Spring bean: @Scheduled(fixedRate = 10000) private void someMethod(){ someRepository.streamBySmth("smth").forEach(this::callSomeMethod); } I am using MySQL database. And when I am running application after some successful method invocations it throws an exception: o.h.engine.jdbc.spi.SqlExceptionHelper : SQL

问题 I want to create an app by implementing DDD using Spring. Let's say I have a business entity Customer and an interface CustomerRepository. Since spring provides CrudRepository and JpaRepository to perform basic CRUD operations and other operations like finder methods by default I want to use them. So my interface becomes @Repository public interface CustomerRepository extends JpaRepository<Customer, Long>{ } But according to DDD, interfaces should be in domain layer and the implementation