jpa

问题 I would like to clarify some points regarding the secondary level cache of hibernate. The point to clarify is, will the HQL queries always hit the database (at least for getting ids). Consider we have entities class Customer { long id; // Primary key String name; set <Address> addressList; // One to many relationship } class Address{ long id; // Primary key String houseName; } The database table for the Address has a foreign key reference to the Customer (id) to support one to many

问题 I'm trying to crete Criteria API query with JSON_VALUE function() is Oracle12c: select * from orderswhere (JSON_VALUE(duty, '$.department') in ( ? , ? , ? ,? , ? , ? , ?)); MODEL: @Entity @Table(name = "orders") @EntityListeners(AuditingEntityListener.class) public class Trade implements Serializable { @Convert(converter = JpaConverterJson.class) private Map<String, Object> duty; ..... } private Specification<InvoicePurchase> reportFormToSpec(Map<String, Object> params) { return (root, query,

问题 Our problem is that we can't get data (which includes empty strings with length 0) from a legacy database due to a StringIndexOutOfBoundsExceptiion originating from Hibernate's CharacterTypeDescriptor . We would like to change Hibernate's behavior to properly resolve empty strings. Example data: 1, 'Berlin', 17277, '', 'aUser' 2, 'London', 17277, '', 'anotherUser' We use hibernate with javax.persistence.Query . String sql = "SELECT * FROM table"; Query query = entityManager.createNativeQuery

问题 Our problem is that we can't get data (which includes empty strings with length 0) from a legacy database due to a StringIndexOutOfBoundsExceptiion originating from Hibernate's CharacterTypeDescriptor . We would like to change Hibernate's behavior to properly resolve empty strings. Example data: 1, 'Berlin', 17277, '', 'aUser' 2, 'London', 17277, '', 'anotherUser' We use hibernate with javax.persistence.Query . String sql = "SELECT * FROM table"; Query query = entityManager.createNativeQuery

问题 Our problem is that we can't get data (which includes empty strings with length 0) from a legacy database due to a StringIndexOutOfBoundsExceptiion originating from Hibernate's CharacterTypeDescriptor . We would like to change Hibernate's behavior to properly resolve empty strings. Example data: 1, 'Berlin', 17277, '', 'aUser' 2, 'London', 17277, '', 'anotherUser' We use hibernate with javax.persistence.Query . String sql = "SELECT * FROM table"; Query query = entityManager.createNativeQuery

问题 I use Spring Boot and Data Rest to create a simple microservice in Java8 and get a postgres exception. My entity: @Entity public class ArchivedInvoice implements Serializable { ... @Column private String invoiceNumber; @Column private java.sql.Date invoiceDate; ... } My repository interface: @RepositoryRestResource(collectionResourceRel = "archivedinvoices", path = "archivedinvoices") public interface ArchivedInvoiceRepository extends PagingAndSortingRepository < ArchivedInvoice, Long > { ...

问题 In spring boot app I have an ElementEntity: .... @Entity public class ElementEntity { @Id int id; Double quantity; String form; String color; String type; String description; @ManyToOne @JoinColumn(name = "form") private FormEntity form; } And I have here FormEntity: @Entity public class FormEntity { ..... @OneToMany @JoinColumn(name = "links") private List<LinksEntity> links; } I want using HQL to generate a query that will sum the values of quantity field, group by color and and to return

问题 In spring boot app I have an ElementEntity: .... @Entity public class ElementEntity { @Id int id; Double quantity; String form; String color; String type; String description; @ManyToOne @JoinColumn(name = "form") private FormEntity form; } And I have here FormEntity: @Entity public class FormEntity { ..... @OneToMany @JoinColumn(name = "links") private List<LinksEntity> links; } I want using HQL to generate a query that will sum the values of quantity field, group by color and and to return

问题 I'm trying to convert the following query to native query, I'm getting empty list while the query is returning 2 tuples following is the query : SELECT s.id AS shopID, s.shop_name AS shopName FROM shop s WHERE s.shop_name LIKE '%store%' ; following is the method I've created which is returning empty list while it's supposed to send a list containing two objects (this is the method of m repository) @Query(value = "SELECT \n" + " s.id AS shopID,\n" + " s.shop_name AS shopName \n" + "FROM\n" + "

问题 I'm trying to convert the following query to native query, I'm getting empty list while the query is returning 2 tuples following is the query : SELECT s.id AS shopID, s.shop_name AS shopName FROM shop s WHERE s.shop_name LIKE '%store%' ; following is the method I've created which is returning empty list while it's supposed to send a list containing two objects (this is the method of m repository) @Query(value = "SELECT \n" + " s.id AS shopID,\n" + " s.shop_name AS shopName \n" + "FROM\n" + "