After I persist and existing or a new entity using entity manager, How do I confirm whether this entity is saved?
$em->persist($entity);
$em->flush();
If your entity has an auto generated value column like id:
#ORM\GeneratedValue(strategy="AUTO")
you may check if the entity was saved by doing
if($entity->getId())
Related
First, my class:
public class Person {
#OneToMany
private List<Address> address;
...
}
My problem is that I want to change from where I am getting the data, first I was getting from database and now I need to fetch from a service, but this probably will break my entity, because I will not have #OneToMany List but a List holding all the address's id.
There is a easier way to change JPA relationship to JAX-RS service? How I will fetch the data now? Maybe a AddressService where I pass all ids and the service return a List, can anyone here help me with a less painful solution?
I have configured doctrine ORM in my ZF2 project and create doctrine entity of whole database. Now, I have added one more table named dashboard_group in database. How can I create Doctrine entity for only this table.
I don't want to replace other created entities.
Use –filter option in your command :
./vendor//bin/doctrine-module orm:convert-mapping --namespace="YourModule\\Entity\\" --force --from-database --filter="dashboard_group" annotation ./module/MonModule/src/
And then to add setter/getter into the generated entity :
./vendor/bin/doctrine-module orm:generate-entities ./module/YourModule/src/ --generate-annotations=true --filter="dashboard_group"
I am using the mapper provided by the AWS SDK, with Java.
I need to update record on DynamoDB: is there any way, using the mapper, to avoid that a null property of a mapped entity is stored on DynamoDB, overwriting the old value?
I try to explain my question with an example.
I have a java entity with three properties: id, a, b. It is mapped to a DynamoDB table with hashKey only, on field id.
On DynamoDB it is stored a record {"id":"1", "a":"aa"}.
After an update called on an entity with id:1, a:null and b:"bb", I find on DynamoDB a record {"id":"1", "b":"bb"}.
Any solutions?
Thanks
You will be very interested in the new SaveBehavior strategy, recently introduced in v1.5.4. The new SaveBehavior strategy is called UPDATE_SKIP_NULL_ATTRIBUTES. This new SaveBehavior is very similar to the existing UPDATE strategy. The only difference is that any attributes sent with null values will not be removed from the item in DynamoDB. Here is the link to the JavaDoc.
I have the entity of some BusinessParticipant, it just simple flat entity. And these Participants may be organized in groups, by user's wish. The group has no data, just id. So creating entity and table seems overkill... I'll wish to have 2 db tables, one for participants and one to link the participant to it's group.
The problem is how should I generate the group id? All the GenerateValue & co. work with #id annotation only.
Are there any way to mark the field that is not PK, to be automatically generated?
I have created a proposal for JPA to support #GeneratedValue on non-id fields.
Please vote here for it to be included in a future release
Depends on your persistence provider. For example, ObjectDB supports #GeneratedValue on normal fields, but this is non-standard functionality. If you're using Hibernate, there's no clean way to do this, see this stackoverflow question: Hibernate JPA Sequence (non-Id)
I have property in my JPA model which is not mapped to any column in the database.
Because of this, the compiler says "column abc cannot be resolved".
Is there any annotation to say that the property is no longer mapped to any DB column, its just kind of utility property in JPA model.
Regards,
Satya
add #javax.persistence.Transient to the property