entitygraph

问题 I use EclipseLink 2.6.3 as JPA provider. I have two entities: @Entity public class ClassA{ @Id private String uuid; private String comment; @OneToMany(fetch = FetchType.EAGER,cascade = CascadeType.ALL,mappedBy = "classA",orphanRemoval = false) @MapKey(name="code") private Map<String,ClassB> texts; //+ getters and setters } @Entity public class ClassB { @Id private String uuid; private String code; private String name; @ManyToOne @JoinColumn(name = "comeColname") private ClassA classA; //

问题 I use EclipseLink 2.6.3 as JPA provider. I have two entities: @Entity public class ClassA{ @Id private String uuid; private String comment; @OneToMany(fetch = FetchType.EAGER,cascade = CascadeType.ALL,mappedBy = "classA",orphanRemoval = false) @MapKey(name="code") private Map<String,ClassB> texts; //+ getters and setters } @Entity public class ClassB { @Id private String uuid; private String code; private String name; @ManyToOne @JoinColumn(name = "comeColname") private ClassA classA; //

来源： https://stackoverflow.com/questions/50949656/spring-data-jpa-parametrize-entitygraph-in-crudrepository-interface

来源： https://stackoverflow.com/questions/50949656/spring-data-jpa-parametrize-entitygraph-in-crudrepository-interface

来源： https://stackoverflow.com/questions/31703532/why-we-need-to-use-entity-graph

来源： https://stackoverflow.com/questions/31703532/why-we-need-to-use-entity-graph

来源： https://stackoverflow.com/questions/31703532/why-we-need-to-use-entity-graph

问题 Given the following domain model, I want to load all Answer s including their Value s and their respective sub-children and put it in an AnswerDTO to then convert to JSON. I have a working solution but it suffers from the N+1 problem that I want to get rid of by using an ad-hoc @EntityGraph . All associations are configured LAZY . @Query("SELECT a FROM Answer a") @EntityGraph(attributePaths = {"value"}) public List<Answer> findAll(); Using an ad-hoc @EntityGraph on the Repository method I can

问题 Given the following domain model, I want to load all Answer s including their Value s and their respective sub-children and put it in an AnswerDTO to then convert to JSON. I have a working solution but it suffers from the N+1 problem that I want to get rid of by using an ad-hoc @EntityGraph . All associations are configured LAZY . @Query("SELECT a FROM Answer a") @EntityGraph(attributePaths = {"value"}) public List<Answer> findAll(); Using an ad-hoc @EntityGraph on the Repository method I can

问题 I have the following design: For reference, I'm only posting the SimpleGame entity: @Entity @Table(name = "\"SimpleGames\"") @NamedQuery(name = SimpleGame.FIND_ALL, query = "SELECT ga FROM SimpleGame ga") @NamedQuery(name = SimpleGame.FIND_ALL_JOIN_SCORES_GROUP_BY_GAME_ID, query = "SELECT ga FROM SimpleGame ga JOIN ga.simpleScores sc GROUP BY ga.id") @NamedEntityGraph(name = SimpleGame.FETCH_SCORES, attributeNodes = {@NamedAttributeNode("simpleScores")}) public class SimpleGame implements