If the sub classes have a common setter method then its possible the use the
that setter as the required single result in the result map. As you interface
will not have setters you'll have to use any one of the sub classes
(BlackSomething or WhiteSomething) as the "class" attribute in the main result
map. The calling java code can do the cast to Isomething interface.
E,g.
<resultMap id="somethingResult" class="BlackSomething">
<result property="id" column="ID"/>
<discriminator column="type" javaType="string">
<subMap value="black" resultMap="blackSomethingResult"/>
<subMap value="white" resultMap="whiteSomethingResult"/>
</discriminator>
</resultMap>
Paul
-----Original Message-----
From: Ilya Boyandin [mailto:[EMAIL PROTECTED]
Sent: Monday, 3 September 2007 4:39 PM
To: [email protected]
Subject: Using discriminator with an interface
Hello all,
is that possible to use discriminator with an interface without setters?
I have something like this in my mappings:
<resultMap id="somethingResult" class="ISomething">
<discriminator column="type" javaType="string">
<subMap value="black" resultMap="blackSomethingResult"/>
<subMap value="white" resultMap="whiteSomethingResult"/>
</discriminator>
</resultMap>
<resultMap id="blackSomethingResult" class="BlackSomething">
...
</resultMap>
<resultMap id="whiteSomethingResult" class="WhiteSomething">
...
</resultMap>
<select id="loadSomething" resultMap="somethingResult">
...
</select>
And I always get this RuntimeException: "resultMap Something.somethingResult
must have at least one result mapping". But somethingResult can't have any
mappings because ISomething is an interface without any setters.
Am I doing something wrong or is there any other way to accomplish this?
Thanks in advance
Ilya
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