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From btymvios <by...@scube.co.za>
Subject Re: Collection with composite key in XML mapping
Date Thu, 05 Nov 2009 14:56:41 GMT

Apologies, there is a typo in my last post the "select" should have read:
    <select id="nestedSelect" parameterType="map"
resultMap="myTypeResultMap">
        SELECT *
        FROM my_type_table
        WHERE other_id = #{id} AND client_id = #{clientId}
    </select>


btymvios wrote:
> 
> Hi All,
> 
> Please could someone assist, I know this might be a silly question with a
> simple answer but I have tried all examples I have found, I have read the
> documentation and I have searched the forums and the internet but to no
> avail.
> 
> I am using the latest beta version of iBatis 3 (beta 5) but had the same
> problem with beta 4. In iBatis v2x these complex key mappings worked fine.
> 
> The documentation states:
> 
> "Note: To deal with composite keys, you can specify multiple column names
> to pass to the nested select statement by using the syntax
> column=”{prop1=col1,prop2=col2}”. This
> will cause prop1 and prop2 to be set against the parameter object for the
> target nested select statement."
> 
> However when I specify this with multiple columns for a collection the
> nested select is never run and no error is reported. In the referenced
> "select" I am accessing the parameters by #{param1Name} and #{param2Name}
> (where param1Name is the name of the first param etc..).
> 
> If I remove this and only specify one parameter like column="col_1" then
> the referenced "select" is executed and the same param is used for both
> parameter mapping in the select. So the collection mapping can access the
> nested select and return a list of the correct type (albeit with a lot of
> incorrect rows due to not matching on the full complex key) but not when I
> have complex keys specified.
> 
> What is the correct notation for using multiple columns for complex keys
> from a "collection" mapping. There are no examples in the documentation
> other than the excerpt above. I have also not found any workable examples
> on the internet.
> 
> I have found references on the internet to accesing params with @{param}
> instead of #{param} which I have also tried with no luck. I have also
> tried specifying paramaterType="map" on the nested select with no results.
> 
> ResultMap (XML file 1):
> <resultMap id="myResultMap" type="ResultClass">
>     <id property="id" column="id" />
>     <id property="clientId" column="client_id" />
>     <result property="someProp" column="some_prop" />
>     <collection property="myList" column="{id=id,clientId=client_id}"
> javaType="ArrayList" ofType="MyType"
> select="other.xml.namespace.MyTypeNS.nestedSelect" />
> </resultMap>
> 
> Select (XML file 2):
> <mapper namespace="other.xml.namespace.MyTypeNS">
>     <resultMap id="myTypeResultMap" type="MyType">
>          <!-- mapping of MyType -->
>     </resultMap>
>     <select id="nestedSelect" parameterType="map"
> resultMap="myTypeResultMap">
>         SELECT *
>         FROM my_type_table
>         WHERE other_id = #{id} AND client_id = #{client_id}
>     </select>
> </mapper>
> 
> Thanks for your time.
> Byron
> 

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