fetch « Batch « JPA Q&A





1. Batch fetching using JPA    coderanch.com

What do you mean by "batch fetching"? Do you wish to page through the results? If so then this can be done in JPA through the Query setFirstResult() and setMaxRows() APIs. If you are trying to fetch relationships you can use the "join fetch" option in your JPQL Query. Some JPA implementations also support cursors, and batch reading of relationships, or ...

2. batch-fetching not working properly?    forum.hibernate.org

I have an application that contains a nested relationship between 3 classes, shown below: Program 1:n Service 1:n SubService Then I have to retrieve from a Program, its associated Services. This means 1 query. But then, for every Service, I want to obtain all its associated SubServices, which means n queries. (this is the typical n+1 selects problem). The first time ...

3. jdbc_batch_size, jdbc_fetch_size, Batch Fetching    forum.hibernate.org

Hibernate version: 2.1.7c

4. question for batch fetching    forum.hibernate.org

I am using hibernate 3 and I am trying to get the following behavior with batch fetching. My classes: I have an object graph where : Object A has Set of Object B Object B has Set of Object C I have batch-size set to 20 for all 3 classes of object A,B,C. And I have not set lazy on the ...

5. How to set hibernate.default_batch_fetch_size    forum.hibernate.org

/WEB-INF/jdbc.properties /WEB-INF/hibernate.properties ...

6. ConcurrentModificationException on batch fetch    forum.hibernate.org

7. OPTIMUM BATCH FETCH FIZE?    forum.hibernate.org

8. Hibernate BatchSize not fetching batch    forum.hibernate.org

@Entity public class Realm { @OneToMany(cascade = CascadeType.ALL, mappedBy = "realm") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) @BatchSize(size=100) public Set getComponents() { return components; } } @Entity public class Component { @ManyToOne(fetch = FetchType.LAZY) @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) @JoinColumn(name = "ownerguid", referencedColumnName="guid", nullable ...

9. Massive batch fetch using sys_refcursor..    forum.hibernate.org

Hi, I am trying to fetch around 4-20 mn rows using a sys_refcursor (Oracle 10g ) and multiple java threads (each specifies a rownum range for the cursor query). I am also using the Hibernate ORM feature - ResultTransformer to bind it to a non-entity for subsequent processing and flushing to text files. I do evict the list flushed to files ...





10. Configuring Default_batch_fetch_size.    forum.hibernate.org

org.hibernate.dialect.PostgreSQLDialect ...