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Handling files using lob in entity [message #638290]

Wed, 10 November 2010 17:29

Arun Joy

Messages: 10
Registered: July 2010

Junior Member

This is my situation.
I want to store @lob in another entity class so that they wont get loaded when i load my entity class ( I know about lazy loading option but cannot use that option). Then maybe i can link a lob in this way without eagerly loading it.

@Entity
public class myClass
{
String fileClassId;
}

@Entity
public class FileClass
{
@id
String id;
@lob
byte[ ] mylob;
}

But the problem with this approach is no foreign key relationship is established between 'fileClassId' and 'id' .
Is there any way to establish it, without causing mylob to load eagerly ? ( and..Lazy loading is not an option for me)

Thanks in advance

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Re: Handling files using lob in entity [message #638556 is a reply to message #638290]

Thu, 11 November 2010 15:55

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

You should just define a OneToOne to the lob entity.

@Entity
public class MyClass
{
@OneToOne(fetch=LAZY)
FileClass fileClass;
}

Otherwise you will need to query for the lob directly.

If you are just talking about schema creation, then you can add the foreign key constraint yourself, such as in a SessionCustomizer, or your own ddl scripts.

James : Wiki : Book : Blog : Twitter

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