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I am experimenting with moving over to using the UUID and Versioning features introduced recently (inthe hopes that I can eliminate some homegrown code to do much the same thing).
What I am puzzled by is that modifying the basic object does not appear to change the version number.
To configure the DB I am doing the following:
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Hi all, I'm just getting started to use db4o. I have a question regarding the use of UUID to identify an stored object.
What is the proper way to convert a returned Db4oUUID (from ObjectInfo#getUUID()) to an urn:uuid string representation?
e.g. urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6 (as defined in RFC4122 [1])
As stated in ...
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I know how to obtain UUID from stored object . And then it's easy to get signature part from that UUID. BUT Is there a way how to get signature part (database) from empty container?
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Please, give an example in web-app.
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Estou fazendo minha primeira aplicação utilizando o Db4o e me deparei com uma situação que não consegui resolver. Preciso realizar uma query onde a ordenação se dá a partir do último objeto novo gravado (tem que ser um objeto novo não atualizado). Como não existe autoincrement no db4o fiz uma busca no site e achei o UUID que registra o timestamp ...
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Upon further examination, I determined the ‘Unique Field Constraint’ problem was fixed. It occurred while focusing on another issue concerning the retrieval of objects using the IObjectContainer#Ext().GetByUUID method. I explicitly separated (isolated) processing of ‘Transient’ vs ‘Persistent’ object references.
Maybe I should go back to the ...
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Concerning the protection level - we will review it, thanks for pointing out.
But what constructor do you mean for Db4oUUID class? UUID can be obtained from ObjectInfo:
IEExtObjectContainer#GetObjectInfo(Object)
IObjectInfo#GetUUID()
The documentation is ...
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Upon using the GenerateUUIDs method to turn on UUID generation for specific classes in the database, I saved the target objects using IObjectContainer#set and #commit methods. Next, I retrieved the Db4oUUIDs from the database using #Ext().GetObjectInfo(..).GetUUID method and assigned them to a List<Db4oUUID> collection.
Before closing the ...
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Hi!
You can use predefined Unique Universal IDs for disconnected environments (not your own).
''For long-term external references and to identify an object even after it has been copied or moved to another ObjectContainer, db4o supplies Unique Universal IDs ...
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Hi!
What version of db4o are you using? AFAIK in the latest versions of db4o
ExtObjectContainer#getByUUID(Db4oUUID);
takes one parameter of type Db4oUUID.
While
objectContainer.activate(object, depth);
takes two parameters, the object and the depth of activation.
You will find information on the chapter named ''IDs'' in ...
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