Hello,
I am trying to use iBatis in a case where I have an object hierarchy
like the following:
class Foo{
String fooString;
Bar myBar;
//getters and setters omitted
}
abstract class Bar{
String barString;
//getters and setters omitted
}
class SubBar extends Bar{
String subBarString;
//getters and setters omitted
}
I would like to be able to do this:
<resultMap id="fooResultMap" class="Foo">
<result property="fooString" column="foo"/>
<result property="myBar" resultMap="barResultMap"/>
</resultMap>
<resultMap id="barResultMap" class="SubBar">
<result property="barString" column="bar"/>
<result proprty="subBarString" column="sub_bar"/>
</resultMap>
<select id="fooSelect" parameterClass="string" resultClass="Foo"
resultMap="fooResultMap">
SELECT foo, bar, sub_bar FROM table WHERE foo = #value#
</select>
But that gives an InstantiationException (despite the fact that the
barResultMap has the class SubBar, which is concrete, specified). Next I
tried using a discriminator and making a separate barResultMap and
subBarResultMap (where subBarResultMap extends barResultMap) with
<subMap value="*" ...> on a column that is never null (I'm not sure if
wildcard is supported - I couldn't find discriminator in the docs, but
it's not listed on the undocumented features page). That still threw an
exception. Next, I changed the select statement to (the equivalent of):
SELECT foo, bar, sub_bar, 1 as use_submap FROM table WHERE foo = #value#
and used:
<discriminator column="use_submap" javaType="int">
<subMap value="1" resultMap="subBarResultMap"/>
</discriminator>
But no go there either.
Is there any way to do this, short of creating a custom object factory?
Thanks,
--
Kenny Pearce
Hx Technologies
