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Dynamic JPA and AttributeOverrides [message #804538]

Wed, 22 February 2012 18:49

Sunil Varma

Messages: 5
Registered: February 2012

Junior Member

I am using Dynamic JPA Api and would like to know how to use "AttributeOverrides" (or equivalent of) on an embedded type.
For e.g I have a type "Employee" having two attributes of embedded type "MyType".
Employee {
@Embedded
public MyType t1;

@AttributeOverrides({
@AttributeOverride(name = "DBCOL"})
@Embedded
public MyType t2;

}
I was able to create the embedded type mapping using "addAggregateObjectMapping" but havent found way to override the database mapping using Dynamic API.

Is this possible in Dynamic JPA ?

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Re: Dynamic JPA and AttributeOverrides [message #808359 is a reply to message #804538]

Mon, 27 February 2012 17:45

James Sutherland

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

Senior Member

You can use orm.xml with Dynamic JPA, so can use the same JPA overrides in XML.

For the API, you can call addMapping() and pass an AggregateObjectMapping.

It contains the API addFieldNameTranslation() which allows the column names to be overridden.

For its API refer to the JavaDocs,

http://www.eclipse.org/eclipselink/api/2.3/org/eclipse/persistence/mappings/AggregateObjectMapping.html

James : Wiki : Book : Blog : Twitter

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Re: Dynamic JPA and AttributeOverrides [message #809821 is a reply to message #808359]

Wed, 29 February 2012 09:50

Sunil Varma

Messages: 5
Registered: February 2012

Junior Member

Thanks for your response.I tried using the approach but it looks like the overridden mapping specified via "addFieldNameTranslation"is being ignored .
In the code below Iam expecting "EMD_ATTR2.JsonString" to use the db mapping "db_jsonstring_2" but it reverts to "db_jsonstring".
//////START CODE
configureEmbeddable(emdType);
....
dynType.addAggregateObjectMapping("EMD_ATTR", emdType.getType(), false);
AggregateObjectMapping mapping = dynType.addAggregateObjectMapping("EMD_ATTR2", emdType.getType(), false);

mapping.addFieldNameTranslation("db_jsonstring_2","JsonString") ; //overriding here

private static void configureEmbeddable(JPADynamicTypeBuilder emdType) {
emdType.addDirectMapping("Data_Type", String.class, "db_data_type");
emdType.addDirectMapping("JsonString", String.class, "db_jsonstring");
}
/////////END CODE

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Re: Dynamic JPA and AttributeOverrides [message #810814 is a reply to message #809821]

Thu, 01 March 2012 15:36

James Sutherland

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

Senior Member

You have to override using the column names.

mapping.addFieldNameTranslation("db_jsonstring","db_jsonstring_2") ;

James : Wiki : Book : Blog : Twitter

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Re: Dynamic JPA and AttributeOverrides [message #810908 is a reply to message #810814]

Thu, 01 March 2012 17:10

Sunil Varma

Messages: 5
Registered: February 2012

Junior Member

Ok Thanks. I tried that too and it doesnt work. Basically whatever that is being specified by the addFieldNameTranslation is being ignored.

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Re: Dynamic JPA and AttributeOverrides [message #813714 is a reply to message #810908]

Mon, 05 March 2012 16:29

James Sutherland

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

Senior Member

This does work in general, but I'm not sure how the Dynamic support initializes the descriptors.
Ensure you define the parent and child descriptors together.
There could be an issue with how Dynamic JPA does initialization, which you may wish to log a bug on.
Does it work if you use an orm.xml instead of the API?

James : Wiki : Book : Blog : Twitter

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