entitygraph

EclipseLink query exceptions using EntityGraph: “You must define a fetch group manager at descriptor” AND “Fetch group cannot be set on report query”

由 前提是你 提交于 2020-06-29 03:52:33
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

EntityGraph - You must define a fetch group manager at descriptor in order to set a fetch group on the query

由 谁都会走 提交于 2020-06-23 06:48:32
问题 I would like use Entity Graphs in EclipseLink and GlassFish. @Entity @NamedQueries({ @NamedQuery(name = "invoice.all", query = "SELECT i FROM Invoice i")}) @NamedEntityGraph(name = "graph.invoice", attributeNodes = {@NamedAttributeNode("invoiceNum")}) @Table(name = "INVOICE") public class Invoice implements Serializable { private int id; private String bizonylatSzam; ... } EntityManager em = getEntityManagerFactory().createEntityManager(); EntityGraph eg = em.createEntityGraph("graph.invoice"

JPA EntityGraph based on meta model containing MappedSuperclass not possible?

由 感情迁移 提交于 2019-12-11 02:33:30
问题 I'm trying to use the type safe method EntityGraph.addAttributeNodes(Attribute<T, ?> ... attribute) for constructing my entity graph. I have a type hierarchy with a @MappedSuperclass that basically looks like this: @MappedSuperclass public abstract class BaseEntity { @Id private int dbid; } @Entity public class Entity extends BaseEntity { private String someAttribute; } EclipseLink creates this meta model: @Generated(value="EclipseLink-2.5.2.v20140319-rNA", date="2015-08-07T10:46:31")

JPA entity graphs and pagination

由 ≡放荡痞女 提交于 2019-12-08 06:45:09
问题 In my current project we have multiple search pages in the system where we fetch a lot of data from the database to be shown in a large table element in the UI. We're using JPA for data access (our provider is Hibernate). The data for most of the pages is gathered from multiple database tables - around 10 in many cases - including some aggregate data from OneToMany relationships (e.g. "number of associated entities of type X"). In order to improve performance, we're using result set

Hibernate ignores fetchgraph

由 耗尽温柔 提交于 2019-12-04 03:15:04
问题 This is my entity: public class PersonItem implements Serializable{ @Id @Column(name="col1") private String guid; @Column(name="col2") private String name; @Column(name="col3") private String surname; @Column(name="col4") private Date birthDate; //+getters and setters } This is how I get the list of persons: Query query = em.createQuery("Select p from PersonItem p WHERE p.guid IN (:guids)"); EntityGraph<PersonItem> eg = em.createEntityGraph(PersonItem.class); eg.addAttributeNodes("guid"); eg

What is the difference between FETCH and LOAD for Entity graph of JPA?

由 僤鯓⒐⒋嵵緔 提交于 2019-11-28 08:09:49
I'm new to JPA and I'm trying to use entity graph. And I realized when I retrieve data, I need to specify which EntityGraphType I want to use. I read JPA2.1 specification but I'm still not sure how can I use these 2 options properly... the question is... which option should I use if I don't have any specific reqirement? what is the specific situation when I need to use Fetch and Load? I will begin by answering the second part of your question. what is the specific situation when I need to use Fetch and Load? There are two primary ways to load an entity in JPA, eager loading and lazy loading.

Spring Data JPA And NamedEntityGraphs

由 你说的曾经没有我的故事 提交于 2019-11-27 03:34:07
currently I am wrestling with being able to fetch only the data I need. The findAll() method needs to fetch data dependant on where its getting called. I do not want to end up writing different methods for each entity graph. Also, I would avoid calling entitymanagers and forming the (repetitive) queries myself. Basicly I want to use the build in findAll method, but with the entity graph of my liking. Any chance? @Entity @Table(name="complaints") @NamedEntityGraphs({ @NamedEntityGraph(name="allJoinsButMessages", attributeNodes = { @NamedAttributeNode("customer"), @NamedAttributeNode("handling

What is the difference between FETCH and LOAD for Entity graph of JPA?

由 主宰稳场 提交于 2019-11-27 02:10:11
问题 I'm new to JPA and I'm trying to use entity graph. And I realized when I retrieve data, I need to specify which EntityGraphType I want to use. I read JPA2.1 specification but I'm still not sure how can I use these 2 options properly... the question is... which option should I use if I don't have any specific reqirement? what is the specific situation when I need to use Fetch and Load? 回答1: I will begin by answering the second part of your question. what is the specific situation when I need

Spring Data JPA And NamedEntityGraphs

由 有些话、适合烂在心里 提交于 2019-11-26 09:24:53
问题 currently I am wrestling with being able to fetch only the data I need. The findAll() method needs to fetch data dependant on where its getting called. I do not want to end up writing different methods for each entity graph. Also, I would avoid calling entitymanagers and forming the (repetitive) queries myself. Basicly I want to use the build in findAll method, but with the entity graph of my liking. Any chance? @Entity @Table(name=\"complaints\") @NamedEntityGraphs({ @NamedEntityGraph(name=\
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