[#CORE-2515] FetchPlan - support field.field, field#element.field, field#key.field, field#value.field syntax - DataNucleus JIRA

JPOX Core (ARCHIVED)

FetchPlan - support field.field, field#element.field, field#key.field, field#value.field syntax

Created: 09/Sep/05 08:52 AM Updated: 23/Jul/07 12:25 PM

Component/s:

JDO

Affects Version/s:

1.1.0-beta-4

Fix Version/s:

None

Description

« Hide

The JDO2 spec defines the ability to specify fetch groups using field specs including
field1.field2
field1.field2.field3
field1#element
field1#element.field3

Sort Order:

[ Permalink | « Hide ]

Andy Jefferson added a comment - 23/Jul/07 12:25 PM

This is low priority since the same can be achieved by specifying fetch groups for each of the classes concerned.

An example
class A
{
    B b;
}
class B
{
    C c;
}
and we want to have a fetch group that loads up A.b, and B.c. With the above syntax we would add this for class A
<fetch-group name="group1">
    <field name="b"/>
    <field name="b.c"/>"
</fetch-group>

however you could easily do
(class A)
<fetch-group name="group1">
    <field name="b"/>
</fetch-group>
(class B)
<fetch-group name="group1">
    <field name="c"/>
</fetch-group>

Work required to complete this :-
1. Update AbstractPropertyMetaData so that it if a field name of "a.b" is specified it doesnt just put the name as "b".
2. Update FetchGroupMetaData.initialise() so that when encountering a field name specification as above, it finds the class that the field refers to and adds a fetch group of the same name over there (recursive).