jpa

问题 I am defining two EntityManager beans for two different databases. Each EntityManager bean refers to a unique, respective <persistence-unit/> defined in persistence.xml . The same code and config worked fine with Spring 2.x. When I upgrade to Spring 3, I see the following exception while deploying the app in the server: Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [javax.persistence.EntityManagerFactory] is defined: expected single bean

问题 We use Hibernate as a JPA provider and we have a class with a large object field marked with @Lob @Type( type = "org.hibernate.type.TextType" ) private String someString; The column is created as SOMESTRING LONG() This works flawlessly with PostgreSQL and MySQL. With Oracle when persisting the object entityManager.persist( object ); we get an org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update exception. Removing the @Type( type = "org.hibernate.type.TextType" )

问题 I'm trying to get the Hibernate's SessionFactory from JPA's EntityManager with the following lines: @PersistenceContext EntityManager manager; public SessionFactory getSessionFactory(){ sessionFactory = manager.unwrap(SessionFactory.class); } But it throws this exception: org.springframework.orm.jpa.JpaSystemException: Hibernate cannot unwrap interface org.hibernate.SessionFactory; nested exception is javax.persistence.PersistenceException: Hibernate cannot unwrap interface org.hibernate

问题 I'm trying to get the Hibernate's SessionFactory from JPA's EntityManager with the following lines: @PersistenceContext EntityManager manager; public SessionFactory getSessionFactory(){ sessionFactory = manager.unwrap(SessionFactory.class); } But it throws this exception: org.springframework.orm.jpa.JpaSystemException: Hibernate cannot unwrap interface org.hibernate.SessionFactory; nested exception is javax.persistence.PersistenceException: Hibernate cannot unwrap interface org.hibernate

问题 I'm trying to pull an alias from native query in JPA, something like (SUM,COUNT), Well the method can return an integer if i pulled SUM or COUNT perfectly (ONLY if i pulled it alone) . but how can i pull it with the rest of object? here is a sample what i am trying to do @Entity @Table("hotels") public class Hotel { @Column(name="id") @Id private int hotelId; @Column(name="hotel_name") private String hotelName; @OneToMany private List<Availability>list; private int avaialbeCount; //this one

问题 I'm trying to pull an alias from native query in JPA, something like (SUM,COUNT), Well the method can return an integer if i pulled SUM or COUNT perfectly (ONLY if i pulled it alone) . but how can i pull it with the rest of object? here is a sample what i am trying to do @Entity @Table("hotels") public class Hotel { @Column(name="id") @Id private int hotelId; @Column(name="hotel_name") private String hotelName; @OneToMany private List<Availability>list; private int avaialbeCount; //this one

问题 I have a large Excel file, with 32k rows, and a Java-Spring code that persist the Excel data to mySQL database. My code works for about 6k row's, but not for the entire Excel due to JPA limitation. I read that it can be done with JPA Pagination but all so far I found only info that collect data from DB (already persisted with data) and render to a UI. The Excel file contain 32k medicines, and this rows will be persisted into DB. I have this Controller layer with the following method: public

问题 I have a large Excel file, with 32k rows, and a Java-Spring code that persist the Excel data to mySQL database. My code works for about 6k row's, but not for the entire Excel due to JPA limitation. I read that it can be done with JPA Pagination but all so far I found only info that collect data from DB (already persisted with data) and render to a UI. The Excel file contain 32k medicines, and this rows will be persisted into DB. I have this Controller layer with the following method: public

问题 I have a large Excel file, with 32k rows, and a Java-Spring code that persist the Excel data to mySQL database. My code works for about 6k row's, but not for the entire Excel due to JPA limitation. I read that it can be done with JPA Pagination but all so far I found only info that collect data from DB (already persisted with data) and render to a UI. The Excel file contain 32k medicines, and this rows will be persisted into DB. I have this Controller layer with the following method: public

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